CALAGEM E ADUBAÇÃO FOSFATADA COMO ATENUADORES A TOXICIDADE DE ALUMÍNIO EM LATOSSOLO

Abstract

The present study aimed to evaluate the development of the root system of soybean (Glycine Max L. Moench) cv. NS 6006 IPRO sown in rhizotrons containing eight kg of Distroferric Red Latosol (LVdf), enriched with aluminum, and cultivated in a greenhouse with and without soil correction and with different sources in the phosphate fertilization. The design was in randomized blocks in a 2 x 6 factorial scheme, with two soil correction treatments (with and without) and three phosphate fertilization treatments (without fertilization, use of protected monoammonium phosphate and triple superphosphate) with three blocks. The treatments were applied to the volume of soil destined for each rhizotron and incubated for 15 days. After incubation, soil samples were taken for chemical characterization and the soybean was sown on the same day. Soybeans were cultivated until the R3 stage when they were collected and root growth evaluations were carried out through root dry mass and root surface. Then, samples of rhizospheric and non-rhizospheric soils were taken and chemical characterization was carried out. In the chemical characterization, the pH in CaCl2 and in H2O, the Ca2+, the Mg2+, the P (Mehlich 1 and 3), the K+, the H+Al and the Al3+ were analyzed. Soil correction and phosphate fertilization altered soil chemical properties, increased growth in mass and area of ​​explored soil, demonstrating that phosphate fertilization was more efficient in promoting soybean root growth when compared to limestone, even in the presence of aluminum. With the results, it is possible to conclude that soil correction and phosphate fertilization increase the growth of soybean roots, with ST increasing root mass growth and with protected MAP there was less root mass, but greater volume exploitation. of soil.