The intensive use of land alters the distribution of the pore size which imparts consequences on the soil physical quality. The Least Limiting Water Range (LLWR) allows for the visualization of the effects of management systems upon either the improvement or the degradation of the soil physical quality. The objective of this study was to evaluate the physical quality of a Red Latosol (Oxisol) submited to cover crops in the period prior to the maize crop in a no-tillage and […]

Soil compaction limits grain yields. Among others factors, soil amendment with agricultural lime can contribute to micro-aggregate dispersion and the formation of compacted layers. The objective of this study was to evaluate the effect of lime on soil physical attributes related to soil compaction. The experiment was carried out in PVC columns, in a glass house, during 18 months. Sterilized and non-sterilized samples of a dystrophic Red Latosol (Hapludox) were incubated with 0, 1.9, 3.8, 5.7, 7.6 and 15.2 Mg […]

Machinery traffic in modern agriculture is the main cause of soil compaction, and it often affects soybean yields. The objective of this study was to evaluate the development of soybean cultivars in relation to soil compaction levels. An experiment was carried out on a sandy-loam Haplustox located in Jaboticabal County, SP, Brazil. The following compaction levels were tested: T0 = 0 (no tractor passing), T1* = 1, T1 = 1, T2 = 2, T4 = 4 and T6 = tractor […]

Biossolid has been used in agriculture as nutrient source and to improve soil physical attributes. The effect of biossolid on the aggregate stability and soil penetration resistance of a medium texture Oxisol (LVd) and clayey Oxisol (LVef) in Jaboticabal (SP) were evaluated. Dry biosolid mass was applied with a harrow at rates of 0.0, 25.0, 47.5, 50.0 Mg ha-1, incorporated at 0.1 m depth before sowing the maize. Samples were collected in the fifth year after the maize harvest from the 0.0-0.1, 0.1-0.2, […]