Nitrogen fertilization of cereals. 24. Effect of disease control on the nitrogen response of winter wheat and spring wheat with and without application of chlormequat

Dilz, K.; Schepers, J.H.

Stikstof 6(71): 452-458

1972


Accession: 000146018

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Abstract
In trials in 1970, benomyl at 0.5 kg/ha applied to spring wheat cv. Kolibri at stage 7 and stage 10 (Feekes scale) was the best of 3 fungicides tested; at 70 kg N/ha yields were increased from 4.18 to 4.49 t grain DM and at 100 kg N/ha from 4.44 to 4.79 t. Corresponding figures where chlormequat was applied were 4.49-4.84 and 4.65-4.88 t/ha. Where chlormequat + 130 kg N/ha were used, benomyl did not increase grain yields, but thiophanate methyl at the same rates increased the yield from 4.81 to 5.0 t/ha. Benomyl was tested further in 1971 on winter wheat grown on clay soil at 3 sites. Highest grain yields without fungicide were obtained with 105 kg N/ha; treatment with benomyl increased grain yield by 440 kg DM/ha. In one trial with cv. Manella the increase was from 5.57 to 5.94 t/ha at 105 kg N/ha and from 5.28 to 6.15 t/ha at 140 kg N/ha, with indications that the fungicide-treated crop would have responded to even more N. Benomyl increased yields of spring wheat cv. Kaspar in 1971 from 5.3 to 5.54 t/ha at 80 kg N/ha and from 5.3 to 5.7 t/ha at 120 kg N/ha; in this trial a single application of benomyl at ear emergence was as effective as the double application.