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Evidence of high water infiltration rates in a rice field on cununurra clay ord irrigation area western australia



Evidence of high water infiltration rates in a rice field on cununurra clay ord irrigation area western australia



Australia Commonwealth Scientific & Industrial Research Organization Division of Tropical Crops & Pastures Tropical Agronomy Technical Memorandum (32): 1-8



Water losses from flooded rice on Cununurra clay were investigated at Kimberley Research Station, using cropped and uncropped metal cylinders 100 cm and 30 cm diameter, respectively, installed at 1 end of a 1.5 ha field. Nominal water depths were 5, 15 or 30 cm in the cropped and 30 cm in the uncropped cylinders. Water levels were recorded and adjusted twice daily. Mean maximum water loss rates (infiltration plus evapotranspiration) from the cropped cylinders increased from 4.3 to 22.2 cm day-1 with increase in nominal water depth from 5 to 30 cm. Infiltration rates under a nominal head of 30 cm in the uncropped cylinders. Rates obtained with the double ring infiltrometer were generally much lower than most single ring values. The high infiltration rates appeared to be confined to 1 corner of the field. Evidently, wet soil infiltration rates in Cununurra clay can be high and extremely variable.

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