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Itens para a visualização no momento 31-40 of 265
Estimativa da disponibilidade de fósforo para a cultura do arroz irrigado em solos do RS
(Universidade Federal de Santa Maria, 2004-12-17)
The evaluation of the available phosphorus (P) is hindered in lowland soils flooded for the rice cultivation, since the alternation in the oxidation and reduction conditions determine modifications in the dynamics of this ...
Potencial de mineralização anaeróbica do nitrogênio em solos de várzea do Rio Grande do Sul
(Universidade Federal de Santa Maria, 2005-02-23)
The soil organic nitrogen is the main source of N to crops, which is released from soil organic matter (SOM) decomposition by microrganisms. The N fertilization is based
on SOM levels, however, the SOM decomposition and ...
Avaliação da qualidade física de solos irrigados do Rio Grande do Sul e de funções de pedotransferência para a estimativa da retenção de água
(Universidade Federal de Santa Maria, 2016-06-17)
Knowledge of the physical and hydric characteristics of the soil is essential for proper management, aimed at conciliate good yields and soil quality. In agriculture, crop productivity tends to be maximized and environmental ...
Formas de fósforo no tecido de videiras: acúmulo, redistribuição e relação com parâmetros produtivos e composição da uva
(Universidade Federal de Santa Maria, 2016-07-29)
In grapevine production, requirement and phosphorus (P) doses are established on the basis total P content in leaves collected, change in color of fruit and productivity. Phosphorus absorbed, can be accumulated in plant ...
Desenvolvimento de pedotransferência física-empírica para Modelagem da retenção de água no solo
(Universidade Federal de Santa Maria, 2016-02-25)
Soil water retention stems from the action of attractive forces manifested by adsorption and capillary
phenomena. Matric potential (ψ) expresses the soil water retention energy, which varies ...
Aplicação superficial de calcário: até onde migram e até quando persistem os efeitos no perfil do solo?
(Universidade Federal de Santa Maria, 2014-08-04)
Soil acidity is a major limiting factor in crop production. The low solubility of lime is a critical
limitation which restricts its dissolution as well as neutralization of soil acidity in the vicinity of its
particles. ...
Dinâmica do nitrogênio-15N de palha de arroz, soja e sorgo em dois solos de várzea
(Universidade Federal de Santa Maria, 2016-07-29)
The use of alternative crops to rice (Oryza sativa L.), such as soybean (Glycine Maxl.) and sorghum (Sorghum bicolor L.) in lowland areas changes the chemical characteristics of the straw returned to soil. Straw quality ...
Qualidade de águas superficiais e tratamento de águas residuárias por meio de zonas de raízes em propriedades de agricultores familiares
(Universidade Federal de Santa Maria, 2007-02-23)
The anthropic action has changed the water quality of rivers and its tributaries as well as the sheets. In rural areas, where there is the predominance of familiar agriculture linked to the agroindustry, this problem is ...
Teores no solo e espécies químicas na solução de P, Cu e Zn com adições sucessivas de dejetos líquidos de suínos
(Universidade Federal de Santa Maria, 2014-07-29)
The distribution of pig slurry in agricultural areas, by presenting various elements in its
composition, can over time, increase the levels of nutrients in the soil, as well as changing the
distribution of chemical species ...
Emissão de gases de efeito estufa e potencial de aquecimento global em sistemas de culturas intercalares ao tungue (Aleurites fordii)
(Universidade Federal de Santa Maria, 2014-02-26)
The tung (Aleurites fordii) has received attention in recent years as a promising source of raw material for biodiesel production. For this crop to start production after three years of planting, appears in the first year ...