Conservation tillage for double-cropped soybeans in southwestern Louisiana

ABSTRACT:

Field studies were conducted on a Crowley silt loam (Typic Albaqualf) soil to evaluate the potential for direct seeding of soybeans (Glycine max L. Merr.) after wheat (Triticum aestivum L.). Soybean yields, averaged over locations and years (1980–1982), were similar [2,110 versus 2,042 kilograms per hectare (31.4 versus 30.4 bushels/acre)] for conventional seedings and no-till seedings following wheat. Soybean stands also were comparable in conventional and no-till plantings. Weed competition was highest in 1981 where straw was cut high [46–51 centimeters (18–20 inches)] and spread, cut low [15–20 cm (6–8 in)] and burned, and cut low and removed; intermediate where straw was cut low and spread; and lowest where straw was incorporated (conventional seedbed preparation). Weed competition was minimal in all straw residue treatments in 1982. Soybean yields and plant populations were similar for the straw residue treatments in both years.