出版社：Grupo de Pesquisa Metodologias em Ensino e Aprendizagem em Ciências
摘要：Intense and/or inadequate use of soils leads to loss of chemical attributes needed to maintain agricultural production. Soil fertility is just one of several factors that determine the magnitude of crop yields, and it greatly interferes with agricultural productivity. In this context, the objective was to evaluate the effects on the chemical properties of the soil under two types of management with and without agroecological methods. Soil 1 received agroecological management (irrigation, organic fertilization, weeding, mulch) and soil 2 received only harrowing and manual weeding. The pH, the amounts of P, K+, Ca+2, Mg+2, Na+, Al+3, H++Al+3, COT, MO, CTC, SB, V (%) in (%) in the period from August to September 2016. The experimental design used was the DBC with a 4 x 2 factorial with 10 repetitions. 4 depth levels (0-5, 5-10, 10-15 and 15-20 cm) x 2 types of soil. The management employed in soil 1 conditions values of pH, CTC, SB, V (%), K2+, Ca2+, superior to soil 2, together with Na+. 2. Both soils had similar Mg2+ contents although the SB and V (%) were higher for soil 1. 3. The values of Al3+, H++Al3+, m (%) were higher in soil 2, of the same a MO and COT are at a higher level.
