1. Available soil nitrogen - its measurement and some factors affecting its correlation with crop performance
  2. Report of the Bee Department 1968 pt 1
  3. Effect of CCC and glycine betaine on growth and growth‐substance content of primary leaves of dwarf Frenchbean (Phaseolus vulgaris L.)
  4. Nematodes attacking coffee, tea and cocoa, and their control.
  5. Queen confinement, queen piping and swarming in Apis mellifera colonies
  6. The Amounts of Hive-Space Needed by Colonies of European Apis Mellifera
  7. Effect of humidity on the sporulation of Entomophthora aphidis and E. thaxteriana
  8. Effects of time sowing of spring wheat and defoliation of Agropyron repens (L) Beauv. on competition between them
  9. The rapid determination of nitrate in crops, soils, drainage and rainwater by a simple field method using diphenylamine or diphenylbenzidine with glass fibre paper
  10. The effects of formalin, nabam, irrigation and nitrogen on Heterodera avenae Woll., Ophiobolus graminis Sacc. and the growth of spring wheat
  11. Chemical control of the cereal cyst-nematode-can it be economic
  12. The effect of population density on the sex ratio of Heterodera rostochiensis; a two dimensional model
  13. A rapid method for determining the surface area of aluminosilicates from the adsorption dynamics of ethylene glycol vapour
  14. The numerical approach to soil systematics
  15. Microbiology of the soil
  16. The effect of sowing and harvesting dates, plant population and fertilizers on seed yield and quality of direct-drilled sugar-beet seed crops
  17. Some problems connected with monitoring for resistance
  18. Effects of soil fumigation on cereal foot and root pathogens
  19. Laboratory and field assessment of pesticide poisoning of honeybees Apis Mellifera
  20. The effect of liming and fertilizers on the botanical composition of permanent grassland, and on the yield of hay
  21. Use of controlled environments for studying the effects of climate factors on growth and yield
  22. The behaviour of a cotton stainer, Dysdercus intermedius, distant (Heteroptera, Pyrrhocoridae) towards models and its significance for aggregation
  23. o-Quinones formed in plant extracts. Their reactions with amino acids and peptides
  24. The behaviour of nine populations of the potato cyst nematode Heterodera rostochiensis towards three resistant potato hybrids
  25. Near-Cyclic Representations for Some Resolution VI Fractional Factorial Plans
  26. Balanced incomplete block designs with sets of identical blocks
  27. An osmotic method for studying the suction/moisture content relationships of porous materials
  28. A small laboratory apparatus for measuring accelerated loss rates of pesticide deposits by rainwashing
  29. Phage-like Particles From a Lysogenic Thermomonospora
  30. Micro-organisms in the rhizosphere of plants inoculated with Azotobacter chroococcum
  31. Soil-treatments for control of potato tuber-blight
  32. The agronomic significance of soil mapping units
  33. Device for controlling humidity in small insect rearing chambers.
  34. A scheme of semi-micro analysis for the major elements in clay minerals, based on modifications to conventional methods of silicate analysis
  35. Effects on barley and kale of NPK fertilizers containing differing proportions of urea and ammonium nitrate, and either triple superphosphate or mono-urea phosphate
  36. Cation exchange properties of micas: I. The relation between mica composition and potassium exchange in solutions of different pH
  37. A machine for rubbing small samples of sugar beet fruit
  38. Surface resistance of crop canopies
  39. The insect faunas of pear and apple orchards and the effect of windbreaks on their distribution
  40. Metabolism of some organophosphorus insecticides by strains of housefly.
  41. Factors affecting primary patterns of infestation
  42. Detoxification of diazinon by subcellular fractions of diazinon-resistant and susceptible houseflies
  43. The distribution of flying insects near a low hedgerow
  44. An investigation on commercial farms of factors thought to contribute to egg cracking
  45. The relation of photosynthesis by phytometers in the profiles of kale crops to leaf area index above them
  46. The role of vegetation in soil water problems
  47. Properties of some defective strains of tobacco mosaic virus and their behaviour as affected by inhibitors during storage in sap
  48. The behaviour of tomato bushy stunt virus and bromegrass mosaic virus at different temperatures in vivo and in vitro
  49. The determination of sulphur dioxide with rosaniline dyes
  50. The colorimetric determination of calcium in silicate minerals
  51. Growth responses of plants in unsterilized soil to inoculation with vesicular-arbuscular mycorrhiza
  52. Population fluctuations of Heterodera rostochiensis Woll. when susceptible potato varieties are grown continuously
  53. The influence of soil structure and moisture on nematodes, especially xiphinema, longidorus, trichodorus and heterodera spp.
  54. Some reflections on quarantine, distribution and control of plant nematodes
  55. Cultural factors affecting colonization of sugar beet by different aphid species
  56. A laboratory method for assessing the toxicity of stomach poisons to slugs
  57. Oviposition of frit fly (Oscinella frit L.) on oat seedlings and subsequent larval development
  58. The effect of weather on frit fly (Oscinella frit L.) and its predators
  59. Terrain and soil in North Berkshire
  60. Growth responses of plants in unsterilized soil to inoculation with vesicular-arbuscular mycorrhiza
  61. Aniline utilization by a soil pseudomonad
  62. The genus Longidorella Thorne (Nematoda)
  63. Timing of insecticidal sprays to control the wheat-bulb fly, Leptohylemyia coarctata (Fall.)
  64. Trials of Organophosphorus and Carbamate Seed Dressings against Wheat Bulb Fly Leptohylemyia coarctata in 1966–68
  65. Laboratory and field tests in 1966‐67 on chemical control of wireworms (Agriotes spp.)
  66. Some laboratory tests of feeding deterrents and baits against wireworms
  67. Effect of Morphactin on growth of potatoes
  68. A comparison of methods of growing sugar-beet seed
  69. Extraction and handling of plant and soil nematodes
  70. Identification of plant and soil nematodes
  71. Some problems in the systematics of soil nematodes
  72. Methods of investigating populations of the take‐all fungus (Ophiobolus graminis) in soil
  73. Quantitative estimation of soil-borne inoculum of the take-all fungus (Ophiobolus graminis (Sacc.) Sacc.)
  74. Allyfurans
  75. The phenology of skin spot (Oospora pustulans Owen &Wakef.) and other fungal diseases of potato tubers
  76. Control of potato tuber diseases with systemic fungicides
  77. Use of fertilizers on horticultural crops
  78. Control of potato tuber diseases with systemic fungicides
  79. Some processes affecting nitrogen in the soil
  80. Influence of the odour of a honeybee colony's food stores on the behaviour of its foragers
  81. The egg-eating behaviour of Bombus lapidarius L.
  82. The effect of the size of a honeybee colony on its foraging activity
  83. Migration of Laphygma exigua Hubner (Lepidoptera: Noctuidae) to the British Isles in relation to large-scale weather systems
  84. Moth immigrations in the British Isles in July 1968
  85. Effect of seedling treatment on growth and yield of sugar beet in the field
  86. Persistent effects of seedling treatment on growth of sugar beet in pots
  87. Photosynthesis in sugar beet depends on root growth
  88. Heterodera latipons n. sp., a cereal cyst nematode from the Mediterranean region
  89. Two marine species of Aphelenchoides
  90. The relation between stylet and body length in Aphelenchus avenae with observations on Paratylenchus nanus
  91. Investigations on fecundity of Aphelenchus avenae
  92. The mutation of some virulent rhizobiophages into the temperate form
  93. Residual Infectivity and the Extent of Photoreactivation in Three Different Host Plants of uv-irradiated Potato Virus X
  94. Changes in a Heterodera rostochiensis population through the growing season
  95. Apparatus for measuring nematode movement
  96. Effect of CCC on Eyespot (Cercosporella herpotrichoides) of Winter Whear
  97. Effect of paraflan wax on field control of potato blight by copper oxychloride
  98. Effects of spraying plants with suspensions of inert dusts
  99. Aerodynamic and surface factors in evaporation
  100. Effects of soil fumigation on disease incidence, growth, and yield of spring wheat
  101. Action spectrum for inactivation of the infectivity of potato virus X by U.V. radiation
  102. Spermatheca shape in Trophurus spp
  103. Pratylenchus pinguicaudatus n. sp.(Pratylenchinae: Nematoda) with a key to the genus Pratylenchus.
  104. Fertilisers in 2000 AD Phosphorus in agriculture
  105. Plant nutrient cycles
  106. Using chemicals to increase soil productivity
  107. Types of fertilizers used on farm crops in England and Wales, 1966
  108. The Pleistocene deposits of Holderness, East Yorkshire
  109. Age and insect fauna of the Dimlington Silts, East Yorkshire
  110. The mineralogy of Palaeogene sediments in northeast Kent (Great Britain)
  111. The absence of photoreversible pyrimidine dimers in the RNA of ultraviolet-irradiated tobacco mosaic virus
  112. Species and sex-specific compounds from the heads of male bumblebees (Bombus spp.)
  113. The scent gland complex of the adult cotton stainer bug, Dysdercus intermedius
  114. The morphology of the scent glands of Dysdercus intermedius Distant (Hemiptera: Pyrrhocoridae) and a preliminary analysis of the scent gland secretions of the fifth instar larvae
  115. The effect of farmyard manure on the fertilizer requirement of sugar beet
  116. The effects of magnesium fertilizers on yield and chemical composition of sugar beet
  117. Trials on the control of Docking disorder in sugar beet; seed and row treatment with nematicides
  118. Reduction of acetylene by nodules of Trifolium subterraneum as affected by root temperature, Rhizobium strain and host cultivar
  119. Peat Culture of Rhizobium trifolii: an Examination by Electron Microscopy
  120. Growth of Trifolium subterraneum L. Selected for Sparse and Abundant Nodulation as Affected by Root Temperature and Rhizobium Strain
  121. Entomophthora species attacking aphids in England, 1962–66
  122. Entomophthora species attacking aphids in England, 1962–66
  123. Effects of nitrogen and potassium fertilisers on contents of carbohydrates and free amino acids in Italian ryegrass I Effects on growth and soluble‐carbohydrate contents of leaves, stubble and roots
  124. Monarch butterflies coinciding with American passerines in Britain and Ireland in 1968
  125. Interference by cyanide with the measurements of papain hydrolysis
  126. Effect of storage and lipid extraction on the properties of leaf protein
  127. Interactions of Azotobacter with rhizosphere and root-surface microflora
  128. Zeolites of the elinoptilolite–heulandite type in sediments of South-East England
  129. Thin windows for flow proportional counters in x-ray fluorescence spectrometers
  130. Partial silicification of chalk fossils from the Chilterns
  131. The diminution of sulphur contamination of powder specimens in X-ray fluorescence analysis
  132. The determination of sulphur in soils by X-ray fluorescence analysis
  133. Delayed Exchange of Potassium from some Edges of Mica Flakes
  134. Conifer seedling pathology
  135. Diffusion of organophosphorus insecticides in soils
  136. Uptake of phosphorus and other nutrients by maize in western Nigeria
  137. Molecular Structure of Herbicides and their Sorption by Soils
  138. A laboratory‐scale pulper for leafy plant material
  139. A laboratory-scale press for extracting juice from leaf pulp
  140. Mobilisation and fixation of iron and trace elements by aerobically decomposing plant matter.
  141. The effect of organic matter on the determination of iron (II) in soils and rocks
  142. The Park Grass plots at Rothamsted (1856-1949)
  143. Food resources: conventional and novel
  144. Genetics of symbiosis and nitrogen fixation in legumes
  145. The Viruses [Chapter 11]
  146. The production and use of leaf protein
  147. Sampling for aphids by traps and by crop inspection
  148. Growth and yield of six short varieties of spring wheat derived from Norin 10 and of two European varieties
  149. Health hazards from mouldy fodder
  150. Complementary ways of meeting the world’s protein need
  151. Experiments with CCC on wheat: effects of spacing, nitrogen and irrigation
  152. Nutrition experiments in forest nurseries
  153. Viruses, vectors and vegetation [Book Review]
  154. Algorithm AS 18: Evaluation of Marginal Means
  155. Algorithm AS 19: Analysis of Variance for a Factorial Table
  156. A survey of numerical methods useful in taxonomy - mites
  157. Algorithm AS 23: Calculation of Effects
  158. The basis of numerical methods of classification
  159. Further Results on the Effects of Phorate on Losses of Sweet Corn (Zea mays L.) Caused by Frit Fly (Oscinella frit L.)
  160. An Experiment to Assess Losses Caused by Frit-fly (Oscinella frit L) Shoot Attack and the Application of Phorate in a Crop of Sweet Corn (Zea mays L)
  161. Soluble and slow-release PK-fertilizers for seedlings and transplants of Picea sitchensis and Picea abies in two English nurseries
  162. Problem of insecticidal residues in agricultural soils
  163. Problems of soil classification
  164. Portable counter with keyboard and probes
  165. The plant nutrients in crops grown on Broadbalk
  166. The soils of Broadbalk : Plant nutrients in Broadbalk soils
  167. Preservation of leaf protein preparations by air drying
  168. The influence of agricultural practice on soil macro-arthropod populations
  169. Soil pollutants and soil animals
  170. Effects of gamma irradiation on populations of soil invertebrates
  171. Aerial photography in Soil and Land Survey
  172. The multiplication regions and interaction of acute and chronic bee-paralysis viruses in adult honey bees
  173. The signs of adult bee diseases
  174. The multiplication and spread of sacbrood virus of bees
  175. Algorithm AS 20: The efficient formation of a triangular array with restricted storage for data
  176. A fifty-channel digital recorder for thermocouple psychrometers
  177. Some pheromones controlling honeybee behaviour
  178. Nest-entrance marking with pheromones by honeybee-Apis mellifera L and by a wasp Vespula Vulgaris L
  179. Pheromones of the honey bee - The secretion of the Nassanoff gland of the worker
  180. Minimum spanning trees and single linkage cluster analysis
  181. Condensation of ketones with dimethyl dimethylmaleate. A synthesis of calythrone
  182. Structural requirements for pyrethrin-like activity
  183. Pyrethrin 2 and related esters obtained by reconstitution
  184. Nuclear magnetic resonance spectra of natural pyrethrins and related compounds
  185. Insecticidal activity of pyrethrins and related compounds. 2. Relative toxicity of esters from optical and geometrical isomers of chrysanthemic, pyrethric and related acids and optical isomers of cinerolone and allethrolone
  186. The description of data structures for statistical computing
  187. Relationships of yields of maize and cotton, and the response to phosphate fertilizer, with soil phosphate potentials in Tanzania
  188. The buffering capacity of potassium reserves in soils