Produtividade de grãos das culturas de milho e soja semeadas diretamente em campo natural degradado.

Abstract

Aiming to evaluate crop grain production, planted on physically degraded pasture fields, an experiment using different winter cover crops (CN/P – Natural field/Fallow; A – Oats; A + E – Oats plus vetch) was carried out. Using a planter with three or five rows, hitched to the three-point linkage system of a tractor, maize or soybeans were planted, adjusting the fertilizer shank to one of two depths (6 or 12 cm deep). The soil of the field was an Oxisoil, fairly compacted to 1,7 Mg m-3 density. Randomized split plots were used with four repetitions, being the main treatments winter cover crops and summer grain crops, while the working depth of the fertilizer shanks were the secondary treatments. Results of two years showed that higher maize and soybeans production were attained in A+E and A treatments, and maize production was higher using 12 cm working depth. Leguminous winter cover crop resulted in lower soybean production. Fallow had detrimental effects on maize production.