Desempenho agronômico de cultivares de trigo submetidos a diferentes arranjos espaciais de plantas e doses de nitrogênio

Abstract

The spatial arrangement of plants is the combination of seeding rate and row spacing. Nitrogen is the nutrient most demanded and most important nutrient wheat. These factors can be adjusted according to the characteristics of each cultivar such as height and tillering capacity, having strong influence on grain yield and its components. The objective of this study was to evaluate the effects of spatial arrangements of plants and nitrogen rates on grain yield and its components in two wheat cultivars. Cultivars Ametista and CD 150 were submitted to four seeding rates (150, 300, 450 and 600 seeds m-2), two row spacings (0,15 m and 0,25 m) and two rates of nitrogen (20 kg ha-1 and 120 kg ha-1). The three factors were significant for grain yield (GY) for both cultivars studied, except nitrogen rates for the cultivar CD 150. For the number of fertile tillers (NFT) per meter, three factors were significant for both cultivars except row spacing to tend Ametista. The NFT was strongly correlated with the GY. The tiller senescence is higher in severe conditions of competition.