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Disponibilidade de potássio afetada por cultivos em solos com longo histórico de adubação
(Universidade Federal de Santa Maria, 2008-02-15)
In soils containing minerals with potassium in non-exchangeable forms, crops
uptake a larger amount of this nutrient than that the chemical method can extract,
making more difficult the establishment of availability classes ...
Correção da acidez do solo em subsuperfície em um latossolo de textura franco-arenosa sob plantio direto
(Universidade Federal de Santa Maria, 2008-01-29)
In tropical and subtropical areas, especially, where there is the dry period occurrence, the acidity subsurface (below the 10 cm) it has been pointed as one of the limitation causes to the growth of roots and the agricultural ...
Fósforo na água e no sedimento na microbacia hidrográfica do Arroio Lino - Agudo - RS
(Universidade Federal de Santa Maria, 2005-02-19)
The natural ecosystems are modificated by human activities, charging the nutrients and sediments transference to aquatic environments. Our objective were to study the phosphorus (P) dynamic in little cracks after rainfall ...
Classificação do potencial de uso das terras no perímetro urbano de Santa Maria - RS
(Universidade Federal de Santa Maria, 2005-02-23)
In the last decades, the phenomenon of the urbanization has been transforming a large natural spaces into an extremely altered areas. The conversion of a rural society to an urban one has happened without caring with life ...
Dinâmica do fósforo de sedimentos de uma pequena bacia hidrográfica de cabeceira
(Universidade Federal de Santa Maria, 2009-02-26)
The pressure on the natural resources has being shown more intense in the last decades, increasing degradation of air, soil and water around the world. Among the substances related to the environmental impacts that containing ...
Emissão de óxido nitroso e mineralização do carbono de plantas de cobertura e de dejetos suínos e bovínos em plantio direto de mamona
(Universidade Federal de Santa Maria, 2009-02-27)
The increase in the availability of nutrients to soil microorganisms, especially carbon (C) and nitrogen (N), through crop residues and animal slurries can increase
dioxide carbon (CO2) and nitrous oxide (N2O) emissions ...
Superfosfato simples contendo fosfato de ferro de baixa solubilidade aplicado em solos de várzea do Rio Grande do Sul
(Universidade Federal de Santa Maria, 2009-05-21)
Some rocks used in fertilizer production contain impurities of low solubility in water such as iron aluminum phosphate (Fe- Al- P). The use of these rocks
generates simple superphosphate which may contain impurity levels ...
Qualidade física de solos irrigados do Rio Grande do Sul e do Brasil central
(Universidade Federal de Santa Maria, 2005-02-28)
The irrigated áreas are caracterized by an intensification of the land use, and as consequence, an intense use of the soil. This usually results in a higher pressure of the soil structure degradation, causing many times ...
Efeito do calcário em atributos biológicos do solo
(Universidade Federal de Santa Maria, 2005-02-28)
The soil is a complex system composed by live organisms, organic matter, gases, water and minerals parts that interact. In this sense, the soil organisms, besides inhabitants, are part of its composition. In the soil, the ...
Avaliação de sistemas de previsão de ocorrência de phytophthora infestans em batata.
(Universidade Federal de Santa Maria, 2006-02-23)
Late blight in the most important disease of potato crop and it may cause major yield losses in a matter of a few days. The use of forecast modls or systems to predict diseases has the potential of reducing the number of ...