The objective of this work was to assess the performance of corn (Zea maysL.) genotypes as affected by inputs of black oat (Avena strigosa Schreb.) residues applied on the soil surface and nitrogen fertilization under no-tillage system in a Typical Haplustox. The experiment was carried out in a complete randomized block design, arranged in split-split plots with three replicates. The main plots consisted of the amount of crop residues on the soil surface (no crop residue, 5.16 and 10.32 mg ha-1). The split plots were three corn genotypes, and the split-split plots were five nitrogen rates: 0, 60, 120, 180, and 240kg ha-1. An increase in the nitrogen rates decreased nitrogen deficiency and provided an adequate nitrogen supply for corn, under all the amounts of black oat residues. The corn genotypes grown with different amounts of black oat residues and nitrogen rates had different grain yield responses, use of mineralized nitrogen from crop residues, and root growth.
Zea mays; nutritional deficiency; no-tillage; grain yield; root system
