Abstract
Grain yield in the spring crop of continuous double-cropped irrigated corn declined from 11.3 to 7.2 t/ha during 1978-1983. Soil fumigation with DD-MENCS in February reduced root disease, eliminated symptoms of decline, increased yield and reduced populations of basidiomycetes, Phoma spp., Fusarium spp. and total fungi in soil. Fertility and tillage practices, a winter crop of rye, and soil treatments with fenamiphos and metalaxyl did not prevent decline(.)
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