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An attempt to improve the yield and quality of direct drilled winter wheat grown continuously



An attempt to improve the yield and quality of direct drilled winter wheat grown continuously



Journal of Agricultural Science 99(1): 163-172



Six field experiments on the effects of rate and time of application of N, 3 variety trials and 1 trial combining varieties with rates of application of N, all on winter wheat grown continuously and direct-drilled on a single farm, are described and the results discussed. The experiments showed that worthwhile yield responses could be obtained to very high rates of N application and that percentage protein in the grain increased linearly with amount of N supplied even to the highest rate (350 kg N/ha) applied. The effects of time of application were variable but there was a suggestion that applying the N in 2 doses in the spring gave more yield than a single dose, in 1 experiment. Applying some N in the autumn gave no more yield than applying it all in the spring. The variety trials gave results reasonably consistent with those of the National Institute of Agricultural Botany, but the variety .times. N trial showed clear differences between varieties in response to N; the oldest variety, Maris Huntsman, showed a maximum at .apprx. 240 kg N/ha whereas none of the new varieties had reached their maximum by 270 kg N/ha. Field trials devoted to improving crop yields for a particular farm are worthwhile if site .times. treatment interaction is large and season .times. treatment interaction is small.

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Accession: 004719600

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