RELAÇÃO DE ATRIBUTOS DA FERTILIDADE DO SOLO E A POPULAÇÃO DE Pratylenchus brachyurus E Helicotylenchus sp. NA CULTURA DA SOJA

Abstract

The damages to soybean crop productivity because of harmful caused by phytonematoids are increasing. There are several environmental and soil management factors that interfere with the incidence of such pests, and the present study aimed to assess the relationship between soil fertility parameters and population density of P. brachyurus and Helicotylenchus sp. in soybean culture. For this, 45 samples of soil and soybean roots were carried out, at the R1 phenological stage, from an area with a history of P. brachyurus and Helicotylenchus sp presence. The samples were processed and analyzed for identification and quantification of phytomatomatoids; in soil samples, the following fertility parameters were also determined: OM, pH, P, K, Ca, Mg, S, Al + 3, H + Al + 3, B, Cu, Fe, Mn, Zn, SB, CTC and V%. The data obtained were submitted to Pearson's correlation analysis, at a significance level of 5%. There was no correlation between soil fertility attributes and the population of P. brachyurus in soil. However, its occurrence in the roots was negatively correlated with Mg, pH and V%, and positively correlated with H + Al³ and Fe. For the occurrence of Helicotylenchus sp. in soybean roots there was no correlation between the fertility attributes. In soil samples, the occurrence of Helicotylenchus sp. correlates positively with OM and H + Al³.