Crop residues and soil testing results of samples collected by using different soil samplers on no-tillage system.

摘要

A study was conducted to evaluate the effect of removing crop residues on soil test results. Soil sampling was carried out in sandy and clayey soils, with and without the crop residues, using a soil auger or a geo-referenced hydraulic soil coring probe. The effect of crop residues on soil test results changed according to the type of soil sampler used, crop residues and clay content. By using the hydraulic sampler, it was possible to detect differences on the organic matter content of the soil sample as a function of the sampling technique, but it did not occur using the soil auger sampler. On the crop residues presence, the organic matter content increased to 4 g/kg, in sandy soils where soyabean was cropped, and 5 g/kg, in clayey soils where maize was cultivated. Except for the organic matter content, the sampling techniques tested did not affect the soil test results interpretation of the other variables analysed.