Volume 24, Number 1, 2000

Farming and cattle-raising integrated system is an alternative to increase farmers’ yield in southern Brazil (29o 45´south and 53o 42´ west Greenwich). However, grazing and, or, soil tillage may cause soil compaction at levels that can affect root growth and crop yield. The effect of animal trampling in continuous grazing during winter/spring (cold season) and soil management system effects on soil compaction, chemical attributes and root distribution were studied. The soil used was a Red-Yellow Podzolic (Hapludalf), with a loam […]

Two systems of sugar cane harvesting were compared: 1-previous burning (burned cane) and 2-straw spreading over the soil surface (green cane), over an area of Linhares Agropecuária S.A. plantation, in Linhares, Espírito Santo, Brazil. The soil was classified as Yellow Podzolic sandy over medium texture, developed from Barreiras Formation sediments. After six years of sugar cane cultivation (1989-1994), nutrient distribution, humified fractions, and soil microbial biomass dynamics were determined. The green cane system showed an increasing of soil carbon content […]

Growing corn and soybean in acid soils requires lime application to raise the soil pH to reduce the aluminum toxicity and to add the nutrients calcium and magnesium. The residual effect of liming may last for several years of successive cropping. To evaluate this effect, an experiment was carried out in a Low Humic Gley soil in the EMBRAPA Cerrados Research Center, with the broadcasting application of lime levels of 0, 2, 4, 6 and 8 t ha-1, beginning in […]

The aim of this study was to evaluate the effects of vinasse (100 and 200 m3 ha-1) on the degradation and sorption of diuron in Rhodudalf and Haplorthox soiIs. For the degradation study an experiment was carried out in a completely randomized design with a factorial experiment of 2 (soils) x 3 (vinasse: 0, 100 and 200 m3 ha-1), for 120 days. The mineralization was evaluated by radiorespirometry. At the end of the incubation, the original compounds and their metabolites […]

Tannery solid wastes and CrCl3 were applied to two Oxisols in a greenhouse pot experiment. Soils used were a Typic Eutrorthox (Dusky-Red Latosol – LRe) and Typic Haplorthox (Red-Yellow Latosol – LVA) of which the main difference was the manganese reducible content. The tannery wastes were sludge from the liming process with a total dry matter chromium content of 0.06 g kg-1 (LCL) and the primary sludge (LCR) with a total dry matter chromium content of 17 g kg-1. The […]