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

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. 100 kg 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 (2 6 ).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.

Response of spring barley to fungicides, plant growth regulators, and supplemental nitrogen

“…The application of supplemental N to healthy standing crops forms the basis of integrated cereal management (Widdowson et al 1982). On the basis of data reported herein, use of supplemental N for spring barley on P.E.I, should be integrated with the use of fungicides to optimize both protein and grain yield of cultivars similar to those utilized in this study.…”

Effect of Nitrogen and Seeding Rate on β-Glucan, Protein, and Grain Yield of Naked Food Barley in No-Till Cropping Systems in the Palouse Region of the Pacific Northwest

“…Cultivar, environmental factors, and nitrogen fertilization have been reported to affect yield, chemical composition, and grain quality of barley (Widdowson et al, 1982;Åman and Newman, 1986;Knudsen et al, 1987;Conry, 1994;Zhang et al, 2001;Anker-Nilssen et al, 2008;Choi et al, 2020). β-glucan and protein are major components of barley (Åman et al, 1985).…”