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EFFECTS OF IRRIGATION FREQUENCY ON SALT REGIME AND COTTON GROWTH UNDER MULCHED DRIP IRRIGATION

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032246,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13816) @2003
Authors:   Guangyong Li, Zhang Qiong, Fujun Cai, Mahbub Alam
Keywords:   Cotton, Mulched drip irrigation, Moisture and salt regime, Irrigation frequency

Xinjiang, located in west part of China, is the biggest cotton production region of the country, with acreage of about 1 million ha planted annually. The area under mulched drip irrigation amounts for 100,000 ha. This study investigated the influences of irrigation application frequencies on the soil salt regimes and cotton growth, under mulched drip irrigation of soils of different salinity. Field experiments were arranged with the following treatments: 2 levels of soil salinity (0.08% and 0.8%), 2 irrigation application frequencies (one irrigation every 2 and 6 days during the stage of blooming-bolling ). Records were made on spatial and temporal soil moisture and salt distributions and the growth and yields of cotton. The experimental results showed that with the same amount of water irrigated, higher frequency irrigation to the soil of higher salinity during the stage of bloomingbolling effectively reduced the salinity level of the wetted soil body and increased yield by 28%. While the higher frequency of irrigation had no significant impacts on the growth and yield of cotton grown in the soil of lower saline level.

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