Atributos físicos e químicos do solo e produtividade da soja após o terceiro ano da calagem

Abstract

Soybean production in Brazil has been increasing on a large scale, much of this due to the advancement of technology and the management of soil fertility, which allow reaching higher levels of productivity. In this context, soybean development can be affected by soil chemical modifications caused by liming. The objective of this work was to verify the effect of increasing doses of lime incorporated in depth at the end of the rains on soybean productivity in the 3rd year of cultivation. Therefore, the experimental method was adopted, since it involved the direct interference of the researcher to establish cause and effect relationships. The experiment has been conducted in Marcelândia since April 2019, in a degraded pasture area at the Pindorama farm. The treatments were installed in a randomized block design with increasing doses of dolomitic limestone (0.0; 3.0; 6.0; 9.0; 12 t ha-1) applied deeply incorporated in April/2019, before the rainy season, configuring 5 treatments with 4 repetitions. In the 2022/23 harvest, in July, the soil was sampled, and later soybeans were sown on 11/04/2021. The results showed that the doses influenced the chemical attributes of the soil. Liming performed with incorporation promoted increases in Ca and Mg contents, a decrease in potential soil acidity and an increase in base saturation (V%), but the base saturation method did not reach the calculated V%. The increase in doses did result in a significant increase in productivity after 3 years of liming.