Doses de nitrogênio no milho cultivado em sucessão a plantas de cobertura solteira e consorciadas sob sistema de plantio direto

Abstract

The use of cover crops in no-till system behind new challenges for proper management of nitrogen fertilizer on crops in succession, especially the most demanding in this nutrient, such as corn. This study aimed to evaluate the nitrogen fertilization in corn in succession to cover crops in southwestern Goiás. The experiment was conducted at the Federal University of Goiás -Jataí. The treatments were constituted by a 5X4 factorial, five cover crops (Brachiaria grass (Urochloa ruziziensis) (Crotalaria spectabilis), sorghum consortium (Sorghum bicolor) with braquiária, sorghum intercropping with C. juncea and fallow) and four doses of N topdressing (0, 50, 100, 150 kg ha-1) with four replications, totaling 80 installments. The experimental design was a randomized block. The sorghum consortium with sunn hemp and pasture showed higher intake of dry matter for corn in succession. Crotalaria single or intercropped with forage sorghum provided the largest grain yield in succession. The corn in succession to cover crops was responsive to nitrogen levels in coverage.