Mixed tree cropping systems have been proposed for sustainable nutrient management in the humid tropics. Yet, the nutrient interactions between intercropped trees have not been addressed sufficiently. In the present study we compare the temporal and spatial patterns of the uptake of applied N by four different tree crops in a mixed tree cropping system on a Xanthic Ferralsol in central Amazônia...

In the present study, three soils (Ferralsol, Luvisol topsoil, and Luvisol subsoil) were amended with biochars (charcoal, hydrothermal carbonization coal (HTC) of bark, and low-temperature conversion coal of sewage sludge), wheat straw and a control (no amendment) and incubated over a period of 365 days. Each amendment was applied at a rate of 11.29 g C/kg soil. After incubation, the soils were...

OBJECTIVES Sugarcane cultivation is associated with catchment-wide impacts related to application of vinasse, a nutrient-dense effluent with high eutrophication potential. We evaluated the potential for biochar (charcoal produced from pyrolyzed filtercake) to mitigate carbon and nutrient leaching in a cultivated Brazilian Ferralsol after vinasse application. METHODS Twelve soil columns (soil ...

The objectives of this study were to characterize, classify and evaluate the potential constraints  of  soils Sakure Nginda Payams in Nzara Yambio counties Greenbelt zone Western Equatoria State, South Sudan. Ten soil pits dug, described sampled based on FAO profile description guideline samples analysed using standard routine lab analyses for physical chemical properties. Data genera...

ABSTRACT Most studies about soil organic carbon stock changes in the Cerrado (Brazilian Savanna) biome are either related to field data collected clayey Ferralsols or different land uses, as if they were equilibrium. This study aimed evaluate effect of tillage systems and crop sequences on yield, a sandy Ferralsol from Bahia, Brazil. The experimental design was randomized blocks, with four repl...

A análise integrada solo relevo é fundamental para entender a evolução das paisagens e subsidiar o planejamento ocupação terras, sobretudo em locais sob grande pressão da expansão urbana, exemplo do Litoral Norte Estado Bahia. O presente estudo buscou compreender quais fatores comandaram processo de podzolização como teria evoluído uma região dos Tabuleiros Costeiros Dissecados Grupo Barreiras....

Leaching losses of N are a major limitation of crop production on permeable soils and under heavy rainfalls as in the humid tropics. We established a field trial in the central Amazon (near Manaus, Brazil) in order to study the influence of charcoal and compost on the retention of N. Fifteen months after organic-matter admixing (0–0.1 m soil depth), we added 15N-labeled (NH4)2SO4 (27.5 kg N ha–...