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Study on Intermittent Irrigation For paddy Rice: I. Water Use Efficiency

作者：

Lu Jun~1;T.Hirasawa

单位：

关键词：

intermittent irrigation;paddy rice;soil cracks;water consumption;water use efficiency

摘要：

A field experiment was conducted in a well-puddled paddy fielddeveloped on the Tams River alluvial soil in the Farm of Tokyouniversity of Agriculture and Technology, Japan, to study the effectof intermittent irrigation on water use efficiency of paddy rice.Four treatments were arranged with 2 replicates: continuous floodingirrigation treatments (CFI), and three intermittent irrigationtreatments ii-o, ii-1 and ii-2, in which plants were re-irrigatedwhen the soil water potential fell below 0, -10, and -20 kPa,respectively, at soil depth of about 5 cm. Water consumption waslower in treatment ii-o than in treatment CFI because thepercolation rate was reduced by the reduction in the hydraulic headof ponded water. Intermittent irrigation led to soil repeatedshrinking and swelling in ii-1 and ii-2 plots and, therefore, soilcracks developed rapidly.

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Study on Intermittent Irrigation For paddy Rice: I. Water Use Efficiency

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