ABSTRACT Use of organic fertilizers in integrated crop-livestock (iCL) systems may affect soil phosphorus fractions. This study aimed to determine phosphorus fractions in the soil under the iCL system after six years of application of organic or mineral fertilizers. The experiment was conducted on a Rhodic Kandiudox (Nitossolo Vermelho Distroférrico) in a randomized block design, using a 5 × 3 + 1 factorial scheme, with four replicates. The treatments consisted of three organic fertilizers (poultry litter, pig slurry, and compost) […]

Pastures cover nearly 50 million hectares in the Cerrado region. The Oxisols, which cover approximately half this area, are highly weathered soils composed mainly of kaolinite, iron and aluminum oxides. Iron and aluminum oxides have a great influence on the retention of phosphorus (P) in these soils. The aim of this study was to quantify the total phosphorus levels, as well as P availability and retention in Oxisols under pasture in the Cerrado region and to relate the data with […]

Despite relatively high levels of total P, most deeply-weathered tropical soils have very low levels of available P due to the low solubility of most P forms found in these soils. In this research we studied P adsorption of soils, some of which were rich in apatite, developed from basic to ultrabasic volcanic rocks in the Upper Paranaíba region of Minas Gerais State, in relation to the specific surface and clay mineralogy. Samples of eleven B horizons from representative Latosols […]