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Regra de canteiros no Norte da China: avaliacao, modelacao e concepcao visando a modernizacao

By Li Yinong

Abstract

Surface irrigation plays a great role for the irrigated agriculture in China. This study focus the improvement of basin irrigation systems. A large numbers of field evaluations have been carried out for the winter wheat to characterize the current situations. Results show that the average total water application largely exceeds the water requirements. Field evaluation data were used to characterize the Manning's roughness coefficient and the infiltration parameters. Several alternatives of the inverse method, including an optimization model OASP coupled with the surface irrigation model SRFR, were tested to derive such parameters. Several improvements of basin irrigation are evaluated and proposed aiming at: (1) creation favourable surface conditions; (2) setting proper basin sizes; (3) improving field irrigation management. Results from the evaluation of alternative design and field practices show that their application can lead to water savings near 140 mm for the irrigation season. Testing these alternatives in a demonstration area confirmed this potential for water savings in the North China plain by application of improved design and practicesAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1249-074 Lisboa, Portugal / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga

Topics: 02C - Agricultural engineering, BASIN IRRIGATION, FIELD EVALUATION, ADVANCE AND RECESSION, INVERSE METHOD, OPTIMIZATION, IMPROVED IRRIGATION MANAGEMENT
Year: 1999
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Provided by: OpenGrey Repository
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