Results from factorial experiments testing amounts and times of granular N-fertilizer, late sprays of liquid N-fertilizer and fungicides to control mildew and brown rust on two varieties of spring barley at Saxmundham, Suffolk 1975–8

A - Papers appearing in refereed journals

Widdowson, F. V., Jenkyn, J. F. and Penny, A. 1982. Results from factorial experiments testing amounts and times of granular N-fertilizer, late sprays of liquid N-fertilizer and fungicides to control mildew and brown rust on two varieties of spring barley at Saxmundham, Suffolk 1975–8. The Journal of Agricultural Science. 99 (2), pp. 377-390. https://doi.org/10.1017/s0021859600030173

AuthorsWiddowson, F. V., Jenkyn, J. F. and Penny, A.
Abstract

Experiments with spring barley at Saxmundham, in each year from 1975 to 1978, compared two varieties (Julia v Wing), two amounts of granular N-fertilizer (50 v 100kg N/ha) and two times of applying it (seed bed v top-dressing), a liquid N-fertilizer spray (0 v 50 kg N/ha), mildew fungicides (with and without) and a rust fungicide (with and without), in factorial combination (26).

Leaf diseases were assessed and grain weighed and analysed for % N each year. Thousand-grain weights were measured in 1977 and 1978.

Yields were small in 1975 and 1976 because little rain fell in summer, but larger in 1977 and 1978, years with average rainfall.

Mildew was most severe in 1975 and least in 1978, brown rust most severe in 1975 and 1978 and practically absent in 1976. Granular N-fertilizer was best applied to the seed bed in all years, whether or not leaf diseases were controlled. Late sprays of liquid N-fertilizer increased yield less than equivalent amounts of seed-bed N, but increased % N in grain more. However, because they also decreased grain size, less of the N applied as a liquid was recovered by grain than was recovered from granules given earlier. The mildew fungicides increased yields by ca. 0·25 t/ha in 1975 and 1977, but decreased them in 1976. They had little or no effect on % N in grain, but increased grain size in 1977. The rust fungicide, benodanil, increased grain yields each year and especially in 1978 (0·37 t/ha). It had no effect on grain % N, but consistently increased grain size and so enhanced grain yield and N uptake.

Year of Publication1982
JournalThe Journal of Agricultural Science
Journal citation99 (2), pp. 377-390
Digital Object Identifier (DOI)https://doi.org/10.1017/s0021859600030173
Open accessPublished as non-open access
Output statusPublished
Publication dates
Print01 Oct 1982
Online27 Mar 2009
Copyright licensePublisher copyright
ISSN0021-8596
PublisherCambridge University Press (CUP)

Permalink - https://repository.rothamsted.ac.uk/item/8vywz/results-from-factorial-experiments-testing-amounts-and-times-of-granular-n-fertilizer-late-sprays-of-liquid-n-fertilizer-and-fungicides-to-control-mildew-and-brown-rust-on-two-varieties-of-spring

Restricted files

Publisher's version

Under embargo indefinitely

8 total views
1 total downloads
0 views this month
0 downloads this month