The value of urea nitrate and urea phosphate as nitrogen fertilizers for grass and barley

A - Papers appearing in refereed journals

Gasser, J. K. R. and Penny, A. 1967. The value of urea nitrate and urea phosphate as nitrogen fertilizers for grass and barley. The Journal of Agricultural Science. 67 (1), pp. 139-146. https://doi.org/10.1017/S0021859600016555

Authors	Gasser, J. K. R. and Penny, A.
Abstract	RESP-5631
Year of Publication	1967
Journal	The Journal of Agricultural Science
Journal citation	67 (1), pp. 139-146
Digital Object Identifier (DOI)	https://doi.org/10.1017/S0021859600016555
Open access	Published as non-open access
Funder	Rothamsted Research
Publisher	Cambridge University Press (CUP)
ISSN	0021-8596

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Longevity of sodium, potassium and magnesium fertilizer residual effects on yield and composition of ryegrass grown on a sandy soil

A - Papers appearing in refereed journals

Bolton, J. and Penny, A. 1978. Longevity of sodium, potassium and magnesium fertilizer residual effects on yield and composition of ryegrass grown on a sandy soil. The Journal of Agricultural Science. 91 (3), pp. 693-699. https://doi.org/10.1017/s0021859600060093

Results from an experiment on permanent grass evaluating aqueous ammonia and aqueous urea, injected in bands either 30 or 60 cm apart

A - Papers appearing in refereed journals

Penny, A., Widdowson, F. V. and Ashworth, J. 1977. Results from an experiment on permanent grass evaluating aqueous ammonia and aqueous urea, injected in bands either 30 or 60 cm apart. The Journal of Agricultural Science. 88 (APR), pp. 319-331. https://doi.org/10.1017/s0021859600034821

Results from two sets of experiments with spring barley, first comparing injected with broadcast nitrogen granules, second comparing injected and combine-drilled NPK solutions with broadcast NPK granules

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1977. Results from two sets of experiments with spring barley, first comparing injected with broadcast nitrogen granules, second comparing injected and combine-drilled NPK solutions with broadcast NPK granules. The Journal of Agricultural Science. 88 (FEB), pp. 35-45. https://doi.org/10.1017/s0021859600033748

Experiments evaluating aqueous ammonia, aqueous urea and a solution of ammonium-nitrate and urea as nitrogenous fertilizers for winter-wheat

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1977. Experiments evaluating aqueous ammonia, aqueous urea and a solution of ammonium-nitrate and urea as nitrogenous fertilizers for winter-wheat. The Journal of Agricultural Science. 89 (OCT), pp. 415-424. https://doi.org/10.1017/s0021859600028343

Soil-nitrogen .9. Effects of leys and organic manures on available-nitrogen in clay and sandy soils

A - Papers appearing in refereed journals

Gasser, J. K. R. and Kalembasa, S. J. 1976. Soil-nitrogen .9. Effects of leys and organic manures on available-nitrogen in clay and sandy soils. Journal of Soil Science. 27 (2), pp. 237-249. https://doi.org/10.1111/j.1365-2389.1976.tb01994.x

Results from two barley experiments at Saxmundham, Suffolk, measuring effects of the fungicide benodanil on three varieties, given three amounts of nitrogen at two times 1973–4

A - Papers appearing in refereed journals

Widdowson, F. V., Jenkyn, J. F. and Penny, A. 1976. Results from two barley experiments at Saxmundham, Suffolk, measuring effects of the fungicide benodanil on three varieties, given three amounts of nitrogen at two times 1973–4. The Journal of Agricultural Science. 86 (2), pp. 271-280. https://doi.org/10.1017/s0021859600054721

Results from experiments measuring effects of large amounts of an npk fertilizer on yield, tuber size and n, p and k contents of 3 potato varieties

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1975. Results from experiments measuring effects of large amounts of an npk fertilizer on yield, tuber size and n, p and k contents of 3 potato varieties. The Journal of Agricultural Science. 85 (DEC), pp. 515-525. https://doi.org/10.1017/s0021859600062390

Results from two experiments with winter wheat, comparing top-dressings of a liquid N-fertilizer either alone or with added herbicide or mildew fungicide or both, and of 'Nitro-Chalk' without or with herbicide or fungicide or both

A - Papers appearing in refereed journals

Penny, A. and Jenkyn, J. F. 1975. Results from two experiments with winter wheat, comparing top-dressings of a liquid N-fertilizer either alone or with added herbicide or mildew fungicide or both, and of 'Nitro-Chalk' without or with herbicide or fungicide or both. The Journal of Agricultural Science. 85 (3), pp. 533-539. https://doi.org/10.1017/s0021859600062419

The distribution in soil of aqueous ammonia injected under grass

A - Papers appearing in refereed journals

Gasser, J. K. R. and Ross, G. J. S. 1975. The distribution in soil of aqueous ammonia injected under grass. Journal of the Science of Food and Agriculture. 26 (6), pp. 719-729. https://doi.org/10.1002/jsfa.2740260602

Results from experiments with winter-wheat, spring barley and grass, comparing a liquid N-fertilizer either alone or with added herbicide and top-dressings of nitro-chalk without or with herbicide sprayed alone

A - Papers appearing in refereed journals

Penny, A. and Freeman, S. C. R. 1974. Results from experiments with winter-wheat, spring barley and grass, comparing a liquid N-fertilizer either alone or with added herbicide and top-dressings of nitro-chalk without or with herbicide sprayed alone. The Journal of Agricultural Science. 83 (3), pp. 511-529. https://doi.org/10.1017/s0021859600027003

Results from experiments measuring effects of large amounts of fertilizer and of farmyard manure on main-crop potatoes grown in sandy soil at Woburn, Bedfordshire

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Flint, R. C. 1974. Results from experiments measuring effects of large amounts of fertilizer and of farmyard manure on main-crop potatoes grown in sandy soil at Woburn, Bedfordshire. The Journal of Agricultural Science. 82 (FEB), pp. 117-127. https://doi.org/10.1017/s0021859600050292

Yields and N, P and K Contents of the Crops Grown in the Rothamsted Reference Experiment, 1956-70,

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1973. Yields and N, P and K Contents of the Crops Grown in the Rothamsted Reference Experiment, 1956-70, . Rothamsted Experimental Station Report. 1972 (2), pp. 111-130.

An assessment of the importance of some factors causing losses of lime from agricultural soils

A - Papers appearing in refereed journals

Gasser, J. K. R. 1973. An assessment of the importance of some factors causing losses of lime from agricultural soils. Experimental husbandry. 25, pp. 86-95.

Results from experiments comparing aqueous and anhydrous ammonia with nitrochalk for grass cut for silage

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Flint, R. C. 1973. Results from experiments comparing aqueous and anhydrous ammonia with nitrochalk for grass cut for silage. The Journal of Agricultural Science. 81 (DEC), pp. 465-480. https://doi.org/10.1017/s0021859600086524

Results from the Woburn Reference Experiment, 1960-1969

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1972. Results from the Woburn Reference Experiment, 1960-1969. Rothamsted Experimental Station Report. 1971 (2), pp. 69-94.

The growth, composition and nutrient uptake of spring wheat: Effects of fertilizer-N, irrigation and CCC on dry matter and N, P, K, Ca, Mg, and Na

A - Papers appearing in refereed journals

Gasser, J. K. R. and Thorburn, M. A. P. 1972. The growth, composition and nutrient uptake of spring wheat: Effects of fertilizer-N, irrigation and CCC on dry matter and N, P, K, Ca, Mg, and Na. The Journal of Agricultural Science. 78 (3), pp. 393-404. https://doi.org/10.1017/S0021859600026307

Results from an experiment comparing aqueous ammonia with Nitro-Chalk for grazed grass

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Flint, R. C. 1972. Results from an experiment comparing aqueous ammonia with Nitro-Chalk for grazed grass. The Journal of Agricultural Science. 79 (2), pp. 341-348. https://doi.org/10.1017/S0021859600032330

Experiments on the use of anhydrous ammonia for grass

A - Papers appearing in refereed journals

Gasser, J. K. R., Blakemore, M. and Flint, R. C. 1972. Experiments on the use of anhydrous ammonia for grass. The Journal of Agricultural Science. 78 (2), pp. 193-201. https://doi.org/10.1017/S002185960006901X

Results from barley experiments comparing aqueous ammonia and aqueous urea with ammonium nitrate, and also liquid with granular NPK fertilizers

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Flint, R. C. 1972. Results from barley experiments comparing aqueous ammonia and aqueous urea with ammonium nitrate, and also liquid with granular NPK fertilizers. The Journal of Agricultural Science. 79 (2), pp. 349-361. https://doi.org/10.1017/S0021859600032342

Nature and value of residual fertilizer nitrogen in soils

A - Papers appearing in refereed journals

Gasser, J. K. R. 1971. Nature and value of residual fertilizer nitrogen in soils. Technical Bulletin Ministry of Agriculture Fisheries and Food. 20, pp. 114-124.

Evaluation of phosphate fertilizers. III. Immediate and residual values of potassium metaphosphate and magnesium ammonium phosphate for potatoes, radishes, barley and ryegrass

A - Papers appearing in refereed journals

Mattingly, G. E. G., Penny, A. and Blakemore, M. 1971. Evaluation of phosphate fertilizers. III. Immediate and residual values of potassium metaphosphate and magnesium ammonium phosphate for potatoes, radishes, barley and ryegrass. The Journal of Agricultural Science. 76, pp. 131-141. https://doi.org/10.1017/S0021859600015677

The Agdell experiment - Estimates of the P and K accumulated from fertiliser dressings given between 1848-1951 their recovery by grass between 1958 and 1970 and their effect on the response by grass to new dressings of P and K

A - Papers appearing in refereed journals

Johnston, A. E. and Penny, A. 1971. The Agdell experiment - Estimates of the P and K accumulated from fertiliser dressings given between 1848-1951 their recovery by grass between 1958 and 1970 and their effect on the response by grass to new dressings of P and K. Rothamsted Experimental Station Report. 1970 (2), pp. 38-68.

Effect of ammonium and nitrate forms of nitrogen and restricted water supply on growth and nitrogen uptake of wheat

A - Papers appearing in refereed journals

Spratt, E. D. and Gasser, J. K. R. 1970. Effect of ammonium and nitrate forms of nitrogen and restricted water supply on growth and nitrogen uptake of wheat. Canadian journal of soil science. 50 (3), pp. 263-273.

The Effects of Partially Sterilising Agricultural Soils With Formalin, and of Applying Nitrogen Fertilisers, on the Yields and N Contents of Spring and Winter Wheat, of Barley and of Grass

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1970. The Effects of Partially Sterilising Agricultural Soils With Formalin, and of Applying Nitrogen Fertilisers, on the Yields and N Contents of Spring and Winter Wheat, of Barley and of Grass. Rothamsted Experimental Station Report. 1969 (Part 2), pp. 113-134. https://doi.org/10.23637/ERADOC-1-34866

Anhydrous ammonia-yields and recoveries by spring wheat.

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1970. Anhydrous ammonia-yields and recoveries by spring wheat. Anhydrous Ammonia. Proceedings of a Symposium on Aspects of its Technology and Use as a Fertilizer.. pp. 61-66.

The effects of three crops and of the N fertilizer given to them on the yield of following barley

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1970. The effects of three crops and of the N fertilizer given to them on the yield of following barley. The Journal of Agricultural Science. 74 (3), pp. 511-522. https://doi.org/10.1017/S0021859600017639

Some biological effects of ammonia injected into soils

A - Papers appearing in refereed journals

Gasser, J. K. R. 1970. Some biological effects of ammonia injected into soils. Anhydrous Ammonia. Proceedings of a Symposium on Aspects of its Technology and Use as a Fertilizer . pp. 30-38.

Nitrification inhibitors their occurrence, production and effects of their use on crop yields and composition

A - Papers appearing in refereed journals

Gasser, J. K. R. 1970. Nitrification inhibitors their occurrence, production and effects of their use on crop yields and composition. Soils and fertilizers. 33 (6), pp. 547-554.

The effects of the nitrogen in soils on the growth, composition and yield of crops

A - Papers appearing in refereed journals

Gasser, J. K. R. 1970. The effects of the nitrogen in soils on the growth, composition and yield of crops. Nitrogen nutrition of the plant. pp. 174-188.

The decomposition of crotonylidene di-urea in soil and the recovery of nitrogen by ryegrass

A - Papers appearing in refereed journals

Gasser, J. K. R. 1970. The decomposition of crotonylidene di-urea in soil and the recovery of nitrogen by ryegrass. The Journal of Agricultural Science. 74 (1), pp. 107-110. https://doi.org/10.1017/S0021859600021031

The effect of ammonium sulphate treated with a nitrification inhibitor, and calcium nitrate, on growth and N-uptake of spring wheat, ryegrass and kale

A - Papers appearing in refereed journals

Spratt, E. D. and Gasser, J. K. R. 1970. The effect of ammonium sulphate treated with a nitrification inhibitor, and calcium nitrate, on growth and N-uptake of spring wheat, ryegrass and kale. The Journal of Agricultural Science. 74 (1), pp. 111-117. https://doi.org/10.1017/S0021859600021043

Effects of fertilizer-nitrogen and water supply on distribution of dry matter and nitrogen between the different parts of wheat

A - Papers appearing in refereed journals

Spratt, E. D. and Gasser, J. K. R. 1970. Effects of fertilizer-nitrogen and water supply on distribution of dry matter and nitrogen between the different parts of wheat. Canadian journal of plant science. 50 (6), pp. 613-625. https://doi.org/10.4141/cjps70-119

Some causes of error in determination of total nitrogen in plant material

A - Papers appearing in refereed journals

Hamlyn, F. G. and Gasser, J. K. R. 1970. Some causes of error in determination of total nitrogen in plant material. Chemistry & Industry. 35, pp. 1142-1143.

Effects of green manuring, farmyard manure, and straw on the organic matter of soil and of green manuring on available nitrogen

A - Papers appearing in refereed journals

Margaret Chater and Gasser, J. K. R. 1970. Effects of green manuring, farmyard manure, and straw on the organic matter of soil and of green manuring on available nitrogen. Journal of Soil Science. 21 (1), pp. 127-137. https://doi.org/10.1111/j.1365-2389.1970.tb01160.x

The value of residues from long-period manuring at Rothamsted and Woburn IV The value to arable crops of residues accumulated from superphosphate

A - Papers appearing in refereed journals

Johnston, A. E., Warren, R. G. and Penny, A. 1970. The value of residues from long-period manuring at Rothamsted and Woburn IV The value to arable crops of residues accumulated from superphosphate. Rothamsted Experimental Station Report. 1969 (Part 2), pp. 39-68. https://doi.org/10.23637/ERADOC-1-34863

The value of residues from long-period manuring at Rothamsted and Woburn V The value to arable crops of residues accumulated from potassium fertilizers

A - Papers appearing in refereed journals

Johnston, A. E., Warren, R. G. and Penny, A. 1970. The value of residues from long-period manuring at Rothamsted and Woburn V The value to arable crops of residues accumulated from potassium fertilizers. Rothamsted Experimental Station Report. 1969 (Part 2), pp. 69-90. https://doi.org/10.23637/ERADOC-1-34864

Available soil nitrogen - its measurement and some factors affecting its correlation with crop performance

A - Papers appearing in refereed journals

Gasser, J. K. R. 1969. Available soil nitrogen - its measurement and some factors affecting its correlation with crop performance. Welsh Soils Discussion Group Reports. 10, pp. 76-92.

Effects on barley and kale of NPK fertilizers containing differing proportions of urea and ammonium nitrate, and either triple superphosphate or mono-urea phosphate

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1969. Effects on barley and kale of NPK fertilizers containing differing proportions of urea and ammonium nitrate, and either triple superphosphate or mono-urea phosphate. The Journal of Agricultural Science. 73 (1), pp. 125-132. https://doi.org/10.1017/S0021859600024205

Some processes affecting nitrogen in the soil

A - Papers appearing in refereed journals

Gasser, J. K. R. 1969. Some processes affecting nitrogen in the soil. Technical Bulletin Ministry of Agriculture Fisheries and Food. 15.

Results of an experiment at Rothamsted testing farmyard manure and N, P and K fertilizers on five arable crops and permanent grass III. Yields 1961–1965

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1968. Results of an experiment at Rothamsted testing farmyard manure and N, P and K fertilizers on five arable crops and permanent grass III. Yields 1961–1965. The Journal of Agricultural Science. 70 (1), pp. 53-58. https://doi.org/10.1017/S0021859600017184

The effects of soil management on available nitrogen

A - Papers appearing in refereed journals

Gasser, J. K. R. 1968. The effects of soil management on available nitrogen. Stikstof. 12, pp. 132-142.

Effects of previous cropping and fertilizer-N applied in field experiments on soil-N available to ryegrass grown in pots

A - Papers appearing in refereed journals

Gasser, J. K. R. and Mitchell, J. D. D. 1968. Effects of previous cropping and fertilizer-N applied in field experiments on soil-N available to ryegrass grown in pots . International congress of soil science. 9 (2), pp. 449-458.

The effects on winter wheat of ammonium sulphate, with and without a nitrification inhibitor, and of calcium nitrate

A - Papers appearing in refereed journals

Gasser, J. K. R. and Hamlyn, F. G. 1968. The effects on winter wheat of ammonium sulphate, with and without a nitrification inhibitor, and of calcium nitrate. The Journal of Agricultural Science. 71 (2), pp. 243-249. https://doi.org/10.1017/S0021859600014702

The effects of potassium and magnesium fertilizers on yield and composition of successive crops of ryegrass, clover, sugar beet, potatoes, kale and barley on sandy soil at Woburn

A - Papers appearing in refereed journals

Bolton, J. and Penny, A. 1968. The effects of potassium and magnesium fertilizers on yield and composition of successive crops of ryegrass, clover, sugar beet, potatoes, kale and barley on sandy soil at Woburn. Journal of the Science of Food and Agriculture. 70 (3), pp. 303-311. https://doi.org/10.1017/S0021859600012624

Evaluation of phosphate fertilizers I. Immediate value of dicalcium phosphate, nitrophosphates, Gafsa rock phosphate, basic slag and potassium metaphosphate for barley and ryegrass

A - Papers appearing in refereed journals

Mattingly, G. E. G. and Penny, A. 1968. Evaluation of phosphate fertilizers I. Immediate value of dicalcium phosphate, nitrophosphates, Gafsa rock phosphate, basic slag and potassium metaphosphate for barley and ryegrass. The Journal of Agricultural Science. 70, pp. 131-138.

Results of an experiment at Woburn testing farmyard manure and N, P and K fertilizers on five arable crops and a long ley: I. Yields

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1967. Results of an experiment at Woburn testing farmyard manure and N, P and K fertilizers on five arable crops and a long ley: I. Yields. The Journal of Agricultural Science. 68 (1), pp. 95-102. https://doi.org/10.1017/S0021859600017901

Experiments comparing the effects on yields of potatoes of three methods of applying three amounts of NPK fertilizer and the residual effects on following winter wheat

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1967. Experiments comparing the effects on yields of potatoes of three methods of applying three amounts of NPK fertilizer and the residual effects on following winter wheat. The Journal of Agricultural Science. 69 (2), pp. 247-257. https://doi.org/10.1017/S0021859600018657

Experiments measuring effects of ammonium and nitrate fertilizers, with and without sodium and potassium, on spring barley

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1967. Experiments measuring effects of ammonium and nitrate fertilizers, with and without sodium and potassium, on spring barley. The Journal of Agricultural Science. 69 (2), pp. 197-207. https://doi.org/10.1017/S0021859600018591

Results of an experiment at Woburn testing farmyard manure and N, P and K fertilizers on five arable crops and on a long ley: II. N, P and K removed by the crops

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1967. Results of an experiment at Woburn testing farmyard manure and N, P and K fertilizers on five arable crops and on a long ley: II. N, P and K removed by the crops. The Journal of Agricultural Science. 68 (2), pp. 293-300. https://doi.org/10.1017/S0021859600016361

The effect of a nitrification inhibitor on the concentration of nitrate in plants

A - Papers appearing in refereed journals

Nowakowski, T. Z. and Gasser, J. K. R. 1967. The effect of a nitrification inhibitor on the concentration of nitrate in plants. The Journal of Agricultural Science. 68 (1), pp. 131-133. https://doi.org/10.1017/S0021859600017949

Effects of ammonium sulphate and calcium nitrate on the growth, yield and nitrogen uptake of barley, wheat and oats

A - Papers appearing in refereed journals

Gasser, J. K. R. and Iordanou, I. G. 1967. Effects of ammonium sulphate and calcium nitrate on the growth, yield and nitrogen uptake of barley, wheat and oats. The Journal of Agricultural Science. 68 (3), pp. 307-316. https://doi.org/10.1017/S002185960001279X

Measurement of losses from fertilizer nitrogen during incubation in acid sandy soils and during subsequent growth of ryegrass, using 15N‐labelled fertilizers

A - Papers appearing in refereed journals

Gasser, J. K. R., Greenland, D. J. and Rawson, R. A. G. 1967. Measurement of losses from fertilizer nitrogen during incubation in acid sandy soils and during subsequent growth of ryegrass, using 15N‐labelled fertilizers. Journal of Soil Science. 18 (2), pp. 289-300. https://doi.org/10.1111/j.1365-2389.1967.tb01507.x

An experiment measuring effects of N, P and K fertilizers on yield and N, P and K contents of grazed grass

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1966. An experiment measuring effects of N, P and K fertilizers on yield and N, P and K contents of grazed grass. The Journal of Agricultural Science. 67 (1), pp. 121-128. https://doi.org//10.1017/S0021859600067654

Ammonia as a fertiliser

A - Papers appearing in refereed journals

Gasser, J. K. R. and Widdowson, F. V. 1966. Ammonia as a fertiliser. Journal of the Institute of Corn and Agricultural Merchants - ICAM. (Winter), pp. 1-4.

Experiments measuring the residual effects of nitrogen fertilizers

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1965. Experiments measuring the residual effects of nitrogen fertilizers. The Journal of Agricultural Science. 65 (2), pp. 195-200. https://doi.org/10.1017/S002185960008391X

An experiment measuring effects of N, P and K fertilizers on yield and N, P and K contents of grass

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1965. An experiment measuring effects of N, P and K fertilizers on yield and N, P and K contents of grass. The Journal of Agricultural Science. 64 (1), pp. 93-100. https://doi.org/10.1017/S0021859600010522

Experiments comparing concentrated and dilute NPK fertilizers and four nitrogen fertilizers on a range of crops

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1965. Experiments comparing concentrated and dilute NPK fertilizers and four nitrogen fertilizers on a range of crops. The Journal of Agricultural Science. 65 (1), pp. 45-55. https://doi.org/10.1017/S002185960008535X

Effects of 2-chloro-6-(trichloromethyl)-pyridine on the nitrification of ammonium sulphate and its recovery by rye-grass

A - Papers appearing in refereed journals

Gasser, J. K. R. 1965. Effects of 2-chloro-6-(trichloromethyl)-pyridine on the nitrification of ammonium sulphate and its recovery by rye-grass. The Journal of Agricultural Science. 64 (3), pp. 299-303. https://doi.org/10.1017/S0021859600016609

Effects of urea on the germination and early growth of kale, barley, and wheat

A - Papers appearing in refereed journals

Gasser, J. K. R. 1965. Effects of urea on the germination and early growth of kale, barley, and wheat. Plant and Soil. 23 (3), pp. 351-370. https://doi.org/10.1007/BF01347729

Fertiliser Urea

A - Papers appearing in refereed journals

Gasser, J. K. R. 1964. Fertiliser Urea. World crops. pp. 1-8.

An experiment comparing responses to nitrogen fertilizer of four grass species Part II Residual effects in wheat and barley

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1964. An experiment comparing responses to nitrogen fertilizer of four grass species Part II Residual effects in wheat and barley. Experimental husbandry. 11, pp. 22-30.

Experiments comparing liquid and solid fertilisers for grass and kale

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1964. Experiments comparing liquid and solid fertilisers for grass and kale. Experimental husbandry. 10, pp. 97-100.

Experiments comparing broadcast and combine drilled dressings of several NPK fertilizers for spring barley

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1964. Experiments comparing broadcast and combine drilled dressings of several NPK fertilizers for spring barley. Experimental husbandry. 14, pp. 83-97.

Experiments testing P and K fertilizers on lucerne 1952-1957

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1964. Experiments testing P and K fertilizers on lucerne 1952-1957. Experimental husbandry. 10, pp. 39-45.

Side-placing urea and other nitrogen fertilizers for spring barley

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1964. Side-placing urea and other nitrogen fertilizers for spring barley. The Journal of Agricultural Science. 62 (1), pp. 73-82. https://doi.org/10.1017/S0021859600059803

Some factors affecting losses of ammonia from urea and ammonium sulphate applied to soils

A - Papers appearing in refereed journals

Gasser, J. K. R. 1964. Some factors affecting losses of ammonia from urea and ammonium sulphate applied to soils. Journal of Soil Science. 15 (2), pp. 258-272. https://doi.org/10.1111/j.1365-2389.1964.tb02224.x

Effects of solutions of urea and of ammonium and potassium salts on the germination of kale, barley and wheat

A - Papers appearing in refereed journals

Gasser, J. K. R. 1964. Effects of solutions of urea and of ammonium and potassium salts on the germination of kale, barley and wheat. Chemistry & Industry. pp. 1687-1689.

Urea as a fertilizer

A - Papers appearing in refereed journals

Gasser, J. K. R. 1964. Urea as a fertilizer. Soils and fertilizers. 27, pp. 175-180.

Fertilizer urea

A - Papers appearing in refereed journals

Gasser, J. K. R. 1964. Fertilizer urea. World crops.

A note on the effects of some soil sterilants on the mineralisation and nitrification of soil‐nitrogen

A - Papers appearing in refereed journals

Gasser, J. K. R. and Peachey, J. E. 1964. A note on the effects of some soil sterilants on the mineralisation and nitrification of soil‐nitrogen. Journal of the Science of Food and Agriculture. 15 (3), pp. 142-146. https://doi.org/10.1002/jsfa.2740150302

Soil nitrogen VIII some factors affecting correlations between measurements of soil‐N status and crop performance

A - Papers appearing in refereed journals

Gasser, J. K. R. and Jephcott, B. M. 1964. Soil nitrogen VIII some factors affecting correlations between measurements of soil‐N status and crop performance. Journal of the Science of Food and Agriculture. 15 (6), pp. 422-428. https://doi.org/10.1002/jsfa.2740150614

An experiment comparing responses to nitrogen fertilizer of four grass species

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1963. An experiment comparing responses to nitrogen fertilizer of four grass species. Experimental husbandry. 9, pp. 28-36.

Experiments comparing yield, and residual effects on winter wheat, of 1-year clover, rye-grass and clover-rye-grass leys

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1963. Experiments comparing yield, and residual effects on winter wheat, of 1-year clover, rye-grass and clover-rye-grass leys. The Journal of Agricultural Science. 61 (3), pp. 397-408. https://doi.org/10.1017/S0021859600018128

A substitute reagent for titanous sulphate for reducing nitrate-N

A - Papers appearing in refereed journals

Gasser, J. K. R. 1963. A substitute reagent for titanous sulphate for reducing nitrate-N. Analyst. 88 (1044), pp. 237-238. https://doi.org/10.1039/AN9638800237

Soil nitrogen VII Correlations between measurements of nitrogen status of soils and nitrogen % and nitrogen content of crops

A - Papers appearing in refereed journals

Gasser, J. K. R. and Williams , R. J. B. 1963. Soil nitrogen VII Correlations between measurements of nitrogen status of soils and nitrogen % and nitrogen content of crops. Journal of the Science of Food and Agriculture. 14 (4), pp. 269-277. https://doi.org/10.1002/jsfa.2740140411

Results of an experiment at Rothamsted testing farmyard manure and N, P and K fertilizers on five arable crops I. Yields

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Cooke, G. W. 1963. Results of an experiment at Rothamsted testing farmyard manure and N, P and K fertilizers on five arable crops I. Yields. The Journal of Agricultural Science. 60 (3), pp. 347-352. https://doi.org/10.1017/S002185960001193X

Experiments with nitrogen and potash on potatoes

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1962. Experiments with nitrogen and potash on potatoes. Experimental husbandry. 8, pp. 30-39.

An experiment comparing urea-formaldehyde fertilizer with nitro-chalk for Italian ryegrass

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1962. An experiment comparing urea-formaldehyde fertilizer with nitro-chalk for Italian ryegrass. The Journal of Agricultural Science. 59 (2), pp. 263-268. https://doi.org/10.1017/S002185960001529X

Effects of long-continued treatment on the mineral nitrogen content and mineralisable nitrogen of soil from selected plots of the Broadbalk experiment on continuous wheat, Rothamsted

A - Papers appearing in refereed journals

Gasser, J. K. R. 1962. Effects of long-continued treatment on the mineral nitrogen content and mineralisable nitrogen of soil from selected plots of the Broadbalk experiment on continuous wheat, Rothamsted. Plant and Soil. 17 (2), pp. 209-220. https://doi.org/10.1007/BF01376225

Transformation, leaching and uptake of fertiliser‐N applied to winter and to spring wheat grown on a light soil

A - Papers appearing in refereed journals

Gasser, J. K. R. 1962. Transformation, leaching and uptake of fertiliser‐N applied to winter and to spring wheat grown on a light soil. Journal of the Science of Food and Agriculture. 13 (7), pp. 367-375. https://doi.org/10.1002/jsfa.2740130704

Applying nitrogen fertilizers for spring barley

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1961. Applying nitrogen fertilizers for spring barley. The Journal of Agricultural Science. 56 (1), pp. 39-47. https://doi.org/10.1017/S0021859600023789

Autumn nitrogen for winter wheat

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1961. Autumn nitrogen for winter wheat. The Journal of Agricultural Science. 57 (3), pp. 329-334. https://doi.org/10.1017/S0021859600049297

Experiments with nitrogen and potash on barley

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Williams, R. J. B. 1961. Experiments with nitrogen and potash on barley. The Journal of Agricultural Science. 57 (1), pp. 29-33. https://doi.org/10.1017/S0021859600049972

Effects of air‐drying and air‐dry storage on the mineralisable‐nitrogen of soils

A - Papers appearing in refereed journals

Gasser, J. K. R. 1961. Effects of air‐drying and air‐dry storage on the mineralisable‐nitrogen of soils. Journal of the Science of Food and Agriculture. 12 (11), pp. 778-784. https://doi.org/10.1002/jsfa.2740121110

Determination of the nitrogen requirements of crops by analysis 1 Laboratory method of measuring soil nitrogen status and methods of correlating measurements with crop performance

A - Papers appearing in refereed journals

Gasser, J. K. R. 1961. Determination of the nitrogen requirements of crops by analysis 1 Laboratory method of measuring soil nitrogen status and methods of correlating measurements with crop performance. Technical Bulletin Ministry of Agriculture Fisheries and Food. 15.

Soil nitrogen VI Correlations between laboratory measurements of soil mineral‐N and crop yields and responses in pot and field experiments

A - Papers appearing in refereed journals

Gasser, J. K. R. 1961. Soil nitrogen VI Correlations between laboratory measurements of soil mineral‐N and crop yields and responses in pot and field experiments. Journal of the Science of Food and Agriculture. 12 (8), pp. 562-573. https://doi.org/10.1002/jsfa.2740120806

Transformation, leaching and uptake of fertilizer nitrogen applied in autumn and spring to winter wheat on a heavy soil

A - Papers appearing in refereed journals

Gasser, J. K. R. 1961. Transformation, leaching and uptake of fertilizer nitrogen applied in autumn and spring to winter wheat on a heavy soil. Journal of the Science of Food and Agriculture. 12 (5), pp. 375-380. https://doi.org/10.1002/jsfa.2740120503

Experiments with urea on spring barley.

A - Papers appearing in refereed journals

Widdowson, F. V. and Penny, A. 1960. Experiments with urea on spring barley. Experimental husbandry. 5, pp. 22-26.

The value of calcium nitrate and urea for main-crop potatoes and kale

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A., Williams, R. J. B. and Cooke, G. W. 1960. The value of calcium nitrate and urea for main-crop potatoes and kale. The Journal of Agricultural Science. 55 (1), pp. 1-10. https://doi.org/10.1017/S0021859600021560

The value of calcium nitrate and urea for spring-sown cereals

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A., Williams, R. J. B. and Cooke, G. W. 1959. The value of calcium nitrate and urea for spring-sown cereals. The Journal of Agricultural Science. 52 (2), pp. 200-206. https://doi.org/10.1017/S0021859600036698

Soil nitrogen IV Transformations and Movement of Fertiliser Nitrogen in a Light Soil

A - Papers appearing in refereed journals

Gasser, J. K. R. 1959. Soil nitrogen IV Transformations and Movement of Fertiliser Nitrogen in a Light Soil. Journal of the Science of Food and Agriculture. 10 (3), pp. 192-197. https://doi.org/10.1002/jsfa.2740100309

Comparisons between combine-drilling and broadcasting muriate of potash for spring barley

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A., Williams, R. J. B. and Cooke, G. W. 1959. Comparisons between combine-drilling and broadcasting muriate of potash for spring barley. The Journal of Agricultural Science. 53 (1), pp. 10-16. https://doi.org/10.1017/S0021859600030860

Soil nitrogen V Leaching of nitrate from soils in laboratory experiments

A - Papers appearing in refereed journals

Webster, R. and Gasser, J. K. R. 1959. Soil nitrogen V Leaching of nitrate from soils in laboratory experiments. Journal of the Science of Food and Agriculture. 10 (11), pp. 584-588. https://doi.org/10.1002/jsfa.2740101102

Use of deep-freezing in the preservation and preparation of fresh soil samples

A - Papers appearing in refereed journals

Gasser, J. K. R. 1958. Use of deep-freezing in the preservation and preparation of fresh soil samples. Nature. 181 (May 10), pp. 1334-1335. https://doi.org/10.1038/1811334b0

Report on 1956 experiments on winter and spring sown cereals comparing methods of application of nitrogen and potassium fertilizers and forms of nitrogen fertilizers

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Cooke, G. W. 1957. Report on 1956 experiments on winter and spring sown cereals comparing methods of application of nitrogen and potassium fertilizers and forms of nitrogen fertilizers.

Report on 1956 experiments comparing placing and broadcasting of nitrogen, phosphorus and potassium for potatoes, peas, beans, kale and maize

A - Papers appearing in refereed journals

Widdowson, F. V., Penny, A. and Cooke, G. W. 1956. Report on 1956 experiments comparing placing and broadcasting of nitrogen, phosphorus and potassium for potatoes, peas, beans, kale and maize.

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