153 research outputs found
Comparative agroenvironmental risks of pesticides in different cropping systems: application of the I-Phy indicator
The green revolution laid the foundations of modern agriculture, by using science and technology to produce more from same resources. The pesticides contributed to agricultural output in the last decades; however, their use has resulted in environmental pollution, health problems, soil and water contamination and negative impact on biota. The impacts of agricultural activities to the environment depended on the practices adopted during the production process. Measurement tools to assess the impacts of those practices are necessary to improve agricultural systems and must be evaluated in different ecosystems. Different soils, climates and crops impose many phytosanitary arrangements. This complex network and the fact that most of the indicators and measurement tools are developed for temperate climates makes it difficult to quantify the environmental impacts under subtropical regions. The I-Phy index is a predictive indicator that assesses the risks of pesticide usage in agriculture and identifies as to which practices generate the main environmental impacts of pesticides. The objective of this study was to test the suitability of the I-Phy index for subtropical conditions and, if suitable, compare the pesticide risk between two regions. Five crops were assessed under three different cropping systems: no-tillage, minimal tillage and conventional tillage. The I-Phy index was sensitive in both regions and capable of identifying that no-tillage generally presented risks of environmental pollution slightly lower than the other tillage systems. The results of I-Phy index showed that high environmental vulnerability of the fields and the numerous applications of active ingredients with high risks resulted in high risks of general contamination. The application of I-Phy on these two case studies showed the indicator can be useful as a support tool to farmers, research and extension institutions pursuing management practices with lower impact on the environment
Nutrição e produtividade da cultura do milho em sistemas de culturas e fontes de adubação
Época de aplicação da primeira dose de nitrogênio em cobertura em milho e espécies antecessoras de cobertura de inverno
Flutuação diária e estacional de nitrato e amônio em um Argissolo Vermelho distrófico típico
Soil microbial response to glucose and phosphorus addition under agricultural systems in the Brazilian Cerrado
Contribution a l'etude de la biomasse microbienne des sols a l'aide de microorganismes marques au carbone 14 et a l'azote 15
Diplôme : Dr. d'Universit
Evolution du niveau de biomasse microbienne du sol au cours d'une incubation de longue duree : relations avec la mineralisation du carbone et de l'azote organique
National audienc
Behaviour of newly immobilized nitrogen in three agricultural soils after addition of organic carbon substrates
International audienc
Etude comparee de la mineralisation de differentes fractions cellulaires d'Aspergillus flavus dans un sol fumige ou non au chloroforme
National audienc
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