Agronomic performance of wheat BRS Tarumã under different sowing densities, nitrogen fertilization and cutting managements

Abstract

The use of dual-purpose wheat can be an important tool for the diversification of activities and farm profitability. The objective of this study was to evaluate forage production and grain yield in dual-purpose wheat cultivar BRS Tarumã under different nitrogen doses, sowing densities and cutting managements. The experimental design was completely randomized, with four replications, in a factorial arrangement (sowing density x nitrogen doses), in the main plots, with subdivided plots (cutting managements). The sowing densities used were 400 and 500 suitable seeds m^-2. Nitrogen rates were 100, 150, 200, 250 and 300% of the recommended dose, applied at the base, at tillering and after each cut. The subplots were divided according to the cutting management (no cut, a single cut and two cuts). There was no significant interaction between nitrogen doses, sowing density and cutting manage­ment for the evaluated characteristics. Nitrogen doses and sowing density did not affect grain and forage yield, therefore the dose of 80 kg ha^-1 and 400 suitable seeds m^-2 allowed maximum grain yield. The cutting manage­ment did not change grain size or yield. However, the second cut promoted greater forage accumulation and did not reduce grain yield, therefore, it is feasible to use it for dual-purpose production. The forage crude protein con­tent decreased in the second cut, but was higher than 22%.