Rendimento e qualidade de semente de soja influenciada pela antecipação da adubação

Abstract

This study aimed to evaluate the grain yield and physiological quality of soybean seeds according to soil chemical characteristics. The project was conducted at the Research Center of COODETEC in the agricultural years of 2007/08 and 2008/09. The area was being cultivated with the succession of soybean / wheat under no-tillage system since 1998. The treatments, in number of seven, were distributed in applications for winter and summer in which some were split as needed, varying the amount of phosphorus and potassium. The evaluation parameters were: 1- grain yeld, 2-germination in paper in papel 3- vigor, first count of germination test and 4- levels of phosphorus and potassium. The experimental design used was randomized blocks with seven treatments and four replicates, in which the plots had dimensions of 3.6 m wide and 10.0 m long, with carriers of 2.0 m. The results allowed to conclude that: 1- The partial or total anticipation of fertilization in winter crop at no-tillage system influences the production of soybean grains and physiological quality of seeds, 2- The phosphorus nutrient can be applied earlier in winter crop. In case of potassium it is recommended that the application be done partly in winter crop and the remainder in summer and 3 - There is a little influence of soil fertilization on the nutritional composition of seeds.