Soil physical and phenological attributes of soybean in different management systems and gypsum

The objective of this work was to evaluate the physical attributes of the soil as well as the components of soy production in the different frequencies of soil scarification with and without the use of agricultural gypsum. The experiment was carried out during the 2011/12 and 2012/13 agricultural years in succession of corn crops in the winter and soybean in the summer in Cerrado experimental area, in Selviria - MS. The experimental design was a randomized block design, in a 3 x 2 factorial scheme (soil management x gypsum), with four replications. The management systems were: no-till system continuous (SPDC), no-till system with scarified every twelve months (SPDE 12), no-till system with scarified every six months (SPDE 6), with or without the use of gypsum. The soil physical attributes were evaluated at depths of 0.0-0.10 and 0.10-0.20 m, as well as the agronomic characteristics of the soybean crop. The no-till system continuous (SPDC) over time with the application of gypsum provided continuous values of soil physical attributes in the two layers and years of cultivation. It was also the system that provided higher values of final population and of the mass of one hundred grains, with no increase in soybean yield.