Manejo do solo, velocidade de semeadura nos componentes agronômicos da soja cruzada com e sem adubo

Abstract

This study aimed to evaluate the effect of management systems, sowing speed and fertilization of soybean crop in the cross-sowing system. The study was carried out at FAECA - Agricultural Sciences Experimental Farm of the Federal University of Grande Dourados - UFGD. The experimental area is located at latitude 22º 14 'S and longitude 54º 59' W and 411.75 m altitude. The soil of the area is classified as dystroferric Red Latosol, clayey. The experiment was designed and delineated in a sub-subdivided tests with four replications. The tests in portions consisted of six management systems: untreated (SM), one scarifying operation (EC), two scarifying and one harrowing (CM), one plowing and four destroying railings (PC), one destroying railings (GR) and one scarifying and destroying railing (EG). In subplots (longitudinal direction), sowing was performed at the average speeds of V1 = 4.6; V2 = 5.5; V3 = 7.3 and V4 = 7.8 km h-1 by tractor. Shifting in the transverse direction, in the sub-subplots, cross-sowing was performed with single and double dose of fertilizer. Within the 6 m2 useful area of each subplot, all plants were collected, and after being threshed, their masses and moisture were carried out. The yield was determined considering 13% moisture. Data were submitted to analysis of variance and, when significant, applied Tukey test with 5% probability, for average comparison. Only soil management influenced soybean crop yield, in with EC operation provided 23% higher yield when compared to EG operation. Therefore, soil mobilization through scarification, in this study, positively affected soybean crop yield.