Tiago Camilo Duarte
Abstract:
Soybean has been widely cultivated in Brazil and worldwide for its food and economic importance, which drives several agroindustrial complexes. Aimed to evaluate the effect of single and double row spatial arrangements associated with fertilization levels on the development and yield of Anta 82 RR soybean cultivar, taking into account productive and ecophysiological parameters. The experiment was conducted at the Federal University of Goiás, Jataí Regional, with the experimental design consisting of 10 treatments established in randomized blocks, with subdivided plots, in four replications. Each plot corresponded to a level of fertilization with P and K (0, 50, 100, 200 and 400% of the recommended dose) and the subplots to two types of spatial arrangements: single (0.45 m) and double row (0, 25 x 0.65 m). The recommended dose of P and K was 80 kg ha -1 of P 2 O 5 and 80 kg ha -1 of K 2 O. During the crop development period, the initial plant population, the Falker chlorophyll index, was determined, dry plant mass, leaf area index, cover factor and index leaf nutritional contents. When soybean plants were in stage R8 the following evaluations were performed: final plant population, plant height and first pod insertion, number of pods and grains per plant, number of grains per pod, weight of one thousand grains and productivity. The Anta 82 RR soybean cultivar showed little response to morphological components, using an alternative spatial arrangement. The increase in fertilization level, even with doses 2 and 4 times higher than recommended, allows soybean response in grain yield for the two studied arrangements. The simple arrangement provides higher grain yield, regardless of fertilization level.
