INFLUENCE OF INSECTICIDES AND FUNGICIDES IN THE RIZOSPHERE OF UNCONVENTIONAL FOOD PLANTS (UFP's)

Abstract

The rhizosphere is the region of influence of the roots of the plants in the soil that provide environment favorable to the maximum microbial activity. As the maximum microbial activity occurs in the rhizosphere, several benefits are added to this environment, since it becomes a source of biodiversity of microorganisms capable of maintaining the ecological balance, and also provide significant improvements for plants the soil and for the environment. The objective of this work was to evaluate the influence of xenobiotics (fungicides and insecticides) in an isolated and combined way on the microbial diversity benefices of the rhizosphere under the cultivation of 4 unconventional food plants (UFP's) or exotic vegetables. This work was performed with a randomized complete block design in the 4 x 4 factorial scheme, the first factor being the cultures: Fragaria vesca L. (“morango”), Rumex acetosa L. (“azedinha”), Tropaeolum majus L. (capuchin - “capuchinha”) and Stachys Lanata L. (“peixinho”) and the second factor (application with insecticide, application with fungicide, insecticide / fungicide application and control) with 4 replicates. There was no statistical difference between the cultures in relation to the numbers of fungal and soil CFUs and that the application of xenobiotics (fungicides and insecticides, isolated and combined) did not affect the microbial diversity in the soil cultivated with the crops. The xenobiotics did not affect the microbial diversity present in the soils of the tested cultures, being similar statistically with the control. UFP's crops did not present statistical differences regarding CFU in cultivated soils.