Efeitos da compactação na densidade do solo, macroporosidade e rendimento de grãos das culturas de soja e milho.

Abstract

The objective of this study were to evaluate soil bulk density and macroporosity the compactation level and the wheat grain yield in a typical dystrophic Red Latossol located in Cascavel (PR), Brazil. Soils samples indeform were coleted in the deepers 0,01; 0,1-0,2 e 0,2-0,3 m for analyses of soil bulk density, macroporosity and microporosity. The treatments with compactation levels: T0 = without additional compactation, T1= one wheel, T3= tree wheels e T5= five wheels with compact roll, were arranged in a randomized complete block. The initial population and end population were avaliation by middle rule. The grain yield coleted 5 samples radomized of each treatment, with area 6,15 e 14,25 m2. The results of the physicals atributes and grain yield were analised by T-student, 5% of significance. The medium values de Ds, Ma, of the T0 treatment significancing differed of T1, T3 e T5 treamenats in the depeer 0,0-0,1 e 0,1-0,2 m. The level compactation were not anough to reduced soybean and corn grain yield. The treatments in the yield with additioal compactation no were sufficient to reduced the yield grains of soybean. Ago effects of the mecanism shaft furrowing of the seedrills in reduced Ds and increase macroporosity in depeer 0,0-0,1 m.