Manejo do solo nos atributos físicos e na produtividade do trigo irrigado

Abstract

The objective of this work was to evaluate the influence of different soil tillage systems on soil physical properties and the productivity of wheat crop irrigated in the Tangará da Serra-MT. The experimental design was a randomized block split plot with 8 repetitions being considered the treatments 3 kinds of soil tillage system: conventional tillage with 2 disking (1 heavy and light); minimum tillage with a light disking and no-tillage, with two sampling depths (0 - 0,10 and 0,10 – 0,20 m) being at 42 and 97 days after wheat sowing. The soil physical properties were: macro and micro, total porosity, density, resistance to penetration, mean weight diameter and. mean geometric diameter. We also analyzed the productivity of the crop. The soil minimum tillage and the conventional tillage had an increase in the soil macroporosity at 42 days after sowing, when compared to no-tillage. At 97 days after sowing there was no effect of soil tillage and the microporosity keep different in both depths. In depths 0,10 at 0,20 m the soil tillage increase the macroporosity, total porosity and decrease the microporosity at 42 days due the tillage. The resistance to penetration between the conventional and minimum tillage did not differ in depth and both resistance values always remained below to 2 MPa. The minimum tillage had higher mean weight diameter and mean geometric diameter index related to other preparations evaluated. The productivity of wheat crop showed no difference between soil tillage evaluated.