Produtividade de soja em função da densidade de semeadura e alturas de corte do trigo

Abstract

Soybean have currently a fundamental importance in the Brazilian economy. In recent years, this crop has been breaking down yield barriers, crop season after crop season, and one of the reasons is the no-tillage system improvement, which values in its pillars the direct sowing in the vegetation cover that remains from the previous crop. Wheat can be a crop that precedes soybeans due to the coincidence of both cycles, it also provides a satisfactory soil cover, improving the water use by plants and inhibiting the undesirable plants incidence, among other factors. Adjustments of soybean plant populations by area also allowed for a yield increase. In this study, it is evaluated how the height of cut in the wheat plants harvest interferes in the productivity components, plant height and height of insertion of the first soybean pod in two levels of population density. Three wheat harvest heights (5, 15 and 30 cm) and two plant densities (8 and 13 seeds per linear meter) were tested. Under the conditions in which the experiment was carried out, the variables plant height and productivity did not show significant difference, regardless of the factors analyzed. In two variables, interactions between the factors were observed, thus the best result for the variable mass of a thousand grains was obtained at the height of 15 cm harvest with 8 seeds per linear meter, whereas for the variable number of pods per plant the best result was obtained at harvest height of 30 cm with 8 seeds per linear meter.