Performance of maize hybrids as a function of spatial arrangements during second growth season under irrigation

There is little information on how different spatial arrangements affect modern maize hybrids under irrigation in the second growing season Brazil. The objectives of this study were to evaluate performance genotypes with canopy architecture as a function Southeast Two semi-erect (DKB 390) and erect 230) leaves cultivated during evaluated for plant densities (4, 7 10 × 104 plants?ha?1) row spacings (0.25, 0.50 1.00 m), tropical environment. increase density increased height ear insertion height, but reduced stalk diameter. absorbed photosynthetically active radiation leaf area index also higher densities, reduction SPAD index. enhanced grain yield, however, there was no difference yield between spacings. hybrid DKB 230 (upright leaves) showed greater potential compared 390 (semi-upright leaves). critical 5.2 4.3 390, respectively. estimated that provides maximum are 9.7 8.8 plants?ha?1