Effects of Water-saving Irrigation on Ecological and Physiological Water Requirement and Yield of Cold Rice at Sanjiang Plain

doi:10.7668/hbnxb.2011.06.033

Abstract

Abstract: The ecological and physiological water requirement of rice was studied in a cold paddy field of Sanjiang Plain，and the field experiment was conducted at the Sanjiang Mire Wetland Experimental Station(47°35'N， 133°31'E),Chinese Academy of Sciences． Under intermittent irrigation(IT),moisture irrigation(MT) and continuous flooding irrigation conditions(CSF). The evapotranspiration，percolation and soil evaporation of paddy field were measured by non-weighing lysimeters(test pits with and without bottoms) and micro-lysimeters， respectively． The results showed that compared with that under CSF irrigation， the transpiration under IT irrigation and MT irrigation were not significantly reduced，but 14． 8%， 29． 6% of water amounts were respectively reduced by decreasing the water loss through soil water evaporation，and 22． 7%， 31． 8% of water amounts were respectively reduced by decreasing the water loss through percolation． The water use efficiency of IT irrigation and MT irrigation were increased 28． 6% and 42． 9%， respectively，with significant increases of grain yield． The actual yield of rice under IT and MT was respectively 9． 4% and 12． 7% higher than that under CSF． Water saving and yield increasing of Moisture irrigation were slightly superior to those of intermittent irrigation，but the differences were not significant．

Key words: Cold rice, Water-saving Irrigation, Transpiration, Evaporation, Percolation, Yield

CLC Number:

NIE Xiao, WANG Yi-yong, LIU Xing-tu. Effects of Water-saving Irrigation on Ecological and Physiological Water Requirement and Yield of Cold Rice at Sanjiang Plain[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2011, 26(6): 168-173. doi: 10.7668/hbnxb.2011.06.033.

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