296 resultados para Chuva


Relevância:

10.00% 10.00%

Publicador:

Resumo:

Pós-graduação em Agronomia (Ciência do Solo) - FCAV

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Relevância:

10.00% 10.00%

Publicador:

Resumo:

A produção de alimentos é uma atividade essencial para a existência humana que demanda efetivamente muita água. A chuva é a sua principal fonte e, na falta desta, a irrigação supre essa necessidade, de forma parcial ou integral. A proposta do presente trabalho é levantar informações quantitativas e qualitativas a respeito de pequenas e médias propriedades da região de Presidente Prudente - SP que praticam a agricultura irrigada e apresentar, com base nos dados obtidos em pesquisa de campo, a importância da irrigação na região. Nesta pesquisa, no total foram entrevistados 28 produtores da região. Quanto à gestão do sistema, a pesquisa mostrou que poucos produtores detêm conhecimento e controle de informações para avaliar o incremento em relação à produtividade e a renda. Custos de implantação e manutenção dos sistemas, custo com energia elétrica e dificuldades com reposição de peças desgastadas e/ou danificadas, são apontadas como entraves no processo produtivo quando se utiliza algum sistema de irrigação. Já em relação ao grau de satisfação dos produtores quanto aos sistemas de irrigação que se encontram instalados em suas propriedades, o resultado é bastante positivo. Além do aumento de produtividade e aumento de renda, os produtores pontuaram benefícios tais como a possibilidade de sustentar suas famílias com uma pequena área de plantio, a permanência do homem no campo e a possibilidade de produzir em épocas de seca.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

The nutritional requirements of crops, in general, becomes more intense with the beginning of the reproductive phase, being more critical at the time of seed formation, when considerable amounts of nutrients are they translocation, this requirement should be increased to the fact that nutrients are essential to training and development of new bodies of booking. This study aimed to evaluate the agronomic efficiency of foliar application of zinc (zinc oxide Zn 700 g L-1 ) in bean plant, compared to leaf application of zinc sulphate (ZnSO4) and control (without application of Zn). The experiment was installed in the Faculty of Agricultural Sciences - UNESP / Campus de Botucatu-SP. Was placed in containers with a capacity of 20L of soil and leaf applications encompassing four schemes and two of rain, with 5 replicates per treatment, a total of 40 vessels. The results for the factorial design did not show in general, significantly different answers when evaluated on the simulation of rain or the lack of simulation. The treatment (700g L-1 of ZnO) has demonstrated agronomic efficiency as its foliar application, with results equal or exceed the application of ZnSO4 and control when applied at the same dose of Zn.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

The aim of this study was to evaluate the efficacy of glyphosate and 2,4-D alone and in combination, in the control of Commelina villosa. We studied two methodologies for evaluating herbicide absorption in eight time intervals for washing (simulating rainfall after application) and cutting of leaves (simulating abortion as a defense strategy): 2, 4, 6, 8, 12, 24 and 48 hours after herbicide application, and a treatment without washing or cutting the leaves in a completely randomized design with four replications in a 3 x 7 + 1 factorial design (three herbicides x seven periods – hours after application). Herbicides and doses tested were: glyphosate (1,440 g ha-1), 2,4-D (720 g ha-1) and a mixture of glyphosate + 2,4-D (1,080 + 720 g ha-1). The simulation of rain interfered negatively in the plant control with glyphosate. The control with the herbicide 2,4-D was affected only for the period of 2 hours. Periods of rain simulation did not influence the control of plants with a mixture of glyphosate + 2,4-D. For the study with the cutting of treated leaves, all treatments regardless of the period of cutting the leaves were influenced negatively in terms of plant control, the plants showing regrowth when treated with 2,4-D alone.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Considering that the Brazilian energy source is based on hydroelectric power plants, every moment that it does not rain enough, we are likely to suffer power outage. Making the rational use of energy not only is wise, but also important for financial issues. The industrial sector is of great importance to Brazilian economic context, because it is one that creates more wealth and jobs. It should be noted that it is one of the sectors that consume more electricity. One of the most used equipment in industry is the three phase induction motor, which ends up providing significant waste of energy. For that reasons, studying three phase induction motors is important. One of the ways to evaluate the parameter of the three phase induction motor is using a dynamometer mechanic or electric. This work aims at further studies (and development) of electrodynamometer brake, a type of electrical dynamometer, that is the only one with reversible use. This means, it is possible to measure both the torque and the power transmitted by the electric motors, by the direct method and the indirect. Besides it allows greater stability in the imposition of charges, due to its nature of being able to regenerate the energy imparted by the engines being tested

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)