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Kỷ yếu hội nghị quốc tế 2015
Số tạp chí 17(2015) Trang: 1041-1044
Tạp chí: Proceedings of the 17th ASA Conference

Alternate wetting and drying (AWD) irrigation can save water in rice production while maintaining yields, but little is known about its influence on phosphorus (P) availability or fertiliser requirements. Plant-available P decreases as soil dries, causing P sorption and precipitation, and increases on rewetting, as P is released into plant-available soil fractions. This study examined how extent and frequency of wetting and drying cycles affect P availability in paddy soils. A pot trial showed dissolved inorganic P (DIP) concentrations in the soil increased with intensity of drying (continuously flooded: 1.1 mg P kg-1, re-flooded after drying to 66% moisture content: 2.2 mg P kg-1 and after drying to 5%: 5.1 mg P kg-1). In a field trial, DIP was higher following a double AWD cycle over a 30 day period (0.30 mg P kg-1) than following a single AWD cycle over the same period (0.1 mg P kg-1; Ptreatments; and no differences were found in grain yields when these AWD frequencies were continued through to harvest, probably because soil P concentrations were already at an agronomic optimum for rice. Five farmers interviewed reported using P fertiliser application rates in their AWD irrigation management that varied greatly from recommended levels. The study highlighted that AWD frequency could be managed to capture increases in DIP where P is limiting. Improvement in matching P fertiliser application to crop needs is more likely to produce significant savings regardless of irrigation method. Key words: Rice, water efficiency, irrigation, phosphorus, fertiliser application, Mekong

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