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The book details the birth and development of concepts and theories as well as controversial issues related to the study of hydraulic science and the science of water.

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hydraulics

National Agricultural Library - United States of America

A água na produção agrícola | Water in agricultural production

1978

Reichardt, Klaus

plant-water relationships irrigation farming

National Agricultural Library - United States of America

Abastecimiento de agua por gravedad para poblaciones rurales dispersas : experiencias con nuevas tecnologias, el caso de Poccontoy y Orcconmarca 全文

Mendelsohn, Robert | Dinar, Ariel | Huang, Jikun | Wang, Jinxia

This paper presents new experiences in the province of Andahuaylas, in the Andes of Peru, in a bid to help solve the problem of water supply in rural scattered areas. The central part of the document consists of a study that describes and analyzes the process by which 5 small areas in a scattered rural steeply sloping side of a mountain managed to acquire a sustainable water supply operated by gravity. The study includes 3 chapters. The first chapter examines the water issues in the communities, what solutions developed by the commoners to stock up on water, what are the drawbacks of the traditional system of their drinking water system. The second chapter describes technical aspects of the project, explaining how the technologies employed were the product of the physical and social environment. The third chapter describes the community participation during and after the project.

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para developing countries aluminium sons silicon selenium ...

World Bank - United States of America

Tilapia growth in irrigation water reservoir and water parameters evaluation | Tilápia em reservatório de água para irrigação e avaliação da qualidade da água 全文

2022

Cardoso Filho, Ruy | Campeche, Daniela F. B. | Paulino, Renata V.

This research was carried out aiming to evaluate tilapia production in irrigation water reservoir, improving the productivity in small scale family farms. Tilapia juveniles (3.600) with 8.10 g of initial weight were put in a water reservoir with useful volume of 1,170 m3 and bred for seven and half months. Fish were fed with commercial feed specific for each level. The feed was given 3 times a day, in the amount of 5% of its total biomass. In order to adjust feed amount, fish were weighed every 20 days. At the same time, local water analyses were made and water samples were collected for laboratory analyses. At the end of the trial growth parameters were measured. Average final weight was of 535 g and total final biomass was of 18.489 kg ha-1. Water quality parameters were within optimal values for fish culture. Fish production in the water reservoirs for irrigation is viable for the small scale farmer as a way to increase water, area and family productivity. | Este trabalho foi realizado com o intuito de avaliar o potencial de cultivo de tilápia em reservatório de água para irrigação, aumentando a produtividade em pequenas propriedades familiares. Foram utilizados 3.600 alevinos de tilápia tailandesa, com peso inicial de 8,10 g. Os alevinos foram colocados em um reservatório de água para irrigação, com volume útil de 1.170 m3. O período de cultivo foi de 26/12/2007 a 01/08/2008. Os alevinos foram alimentados com ração comercial extrusada com porcentagem de proteína recomendada para cada fase de crescimento. O arraçoamento restrito foi de três vezes ao dia, com a proporção de 5% da biomassa total. Para o ajuste do fornecimento de ração, foram realizadas biometrias a cada 20 dias. Em cada biometria foram realizadas análises locais dos parâmetros de qualidade da água e amostras da água foram coletadas para análise posterior em laboratório. Ao final do experimento foi realizada a avaliação do desempenho zootécnico dos animais. O peso final médio foi de 535 g e a biomassa final de 18.489 kg ha-1. Os parâmetros de qualidade da água estavam dentro da faixa ótima para cultivo. A produção de peixes em reservatórios de água para a irrigação é viável.

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piscicultura fish culture limnology limnologia crescimento growth o. niloticus

Universidad Federal Rural de Pernambuco - Brazil