Estoques de carbono e nutrientes e macrofauna invertebrada em argissolo sob sistemas agroflorestais e agricultura de corte e queima no norte do Piauí.

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Classificação e seleção de matéria-prima: atividades vitais para alavancar a competitividade da cadeia produtiva da amêndoa de castanha de caju brasileira.

Apesar de a castanha de caju ter influência decisiva no resultado da cadeia produtiva da amêndoa de castanha de caju brasileira, os métodos de classificação e seleção utilizados atualmente não conseguem distinguir com precisão as suas diferenças qualitativas.bitstream/item/35389/1/Bd-014.pd

Soil surface-active fauna in degraded and restored lands of Northeast Brazil.

Land degradation reducing vegetation cover may affect the soil surface-active fauna because both aboveground and belowground invertebrates depend on complex plant communities. In this study, we evaluated the effect of land degradation and restoration on soil fauna in northeast Brazil. Sites differed in degradation status: native vegetation, moderately degraded land, highly degraded land, and land under restoration for 4 years.Published online in Wiley Online Library (wileyonlinelibrary.com) DOI: 10.1002/ldr.224

Integrated crop-livestock-forest system presents a different soil microbial structure in comparison to other land uses.

Soil organic matter (SOM) conservation is essential for environmental services maintenance, especially in tropical agroecosytems where this component is essential for soil fertility, structure and biological activity. Soil microorganisms are the main driver of nutrient cycling, since key processes, such as C and N mineralization, N immobilization, xenobiotics decomposition, denitrification and others are mediated by them. However when the agroecosystems are manipulated, these active components of soils are impacted, changing the carbon and nutrient dynamics. Therefore, the monitoring of the microbial communities is a good tool to indicate changes in soil dynamics. Our objective was to characterize the soil microbial communities under different land uses by using denaturing gradient gel electrophoresis

Short-term effect of sugarcane straw on soil organic carbon pools.

This study aimed to evaluate the short-term effect of sugarcane straw on soil organic carbon (SOC) stocks in tropical soils. The treatments simulated the maintenance of different rates of sugarcane straw (0, 2.2, 5.1, 7.8 and 12 t ha-1) applied on the soil surface, with four replication, and evaluated chemical and biological attributes in four depths (0-0.05; 0.05-0.10; 0.10-0.20; 0.20-0.40 m). Results from soil samples collected in the rainy and dry seasons showed evidence of positive short-term effects of green harvest either on labile and humified soil organic matter (SOM) pools. For the total SOC stocks, we observed linear responses with straw rates in both sampling seasons. A decreased humification index in the topsoil suggests more labile C pools available in the soil, resulting in a significant increase in microbial activity. Microbial indicators point towards a steady equilibrium in SOC turnover, which can lead to future lower increases in SOC stocks if high straw amounts are maintained on the soil surface. Therefore, long-term studies under low-latitude areas are necessary to model the potential of C sequestration in sugarcane green harvest systems

Doenças da bananeira no Estado do Pará.

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Tradução de interfaces de aplicações para idiomas distintos.

Este documento apresenta o esquema de tradução proposto para as telas de entrada de dados do banco de dados de experimentos em manejo de fertilizantes para cana-de-açúcar.bitstream/CNPTIA/10193/1/comtec54.pdfAcesso em: 30 maio 2008