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| DOI：10.13522/j.cnki.ggps.20180528 |
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| Response of Water-thermal Distribution and Yield of Cotton to Different Drip Irrigation Schedules in Oasis Field |
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LI Wenzhen, QI Zhiming, GUI Dongwei, CHEN Xiaoping
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1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2. Cele National Station of Observation and Research for Desert-grassland Ecosystem in Xinjiang, Cele 848300, China; 3. Cele National Station of Observation and Research for Desert-grassland Ecosystems, Cele 848300, China; 4. Unversity of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| 【Objective】Drip irrigation has been increasingly used as an efficient technique in water-scarce region and in this paper, we experimentally studied the effect of different drip irrigation schedules on water-heat distribution in soil and the associated yield of cotton in oasis field.【Method】The experiments were conducted in 2017 at a filed in Cele area. The irrigating time was determined based on a computer model prediction and soil moisture measurement respectively, each having two irrigation amounts: fully adequate irrigation (100%) and deficit irrigation with 75% of water used in the adequate irrigation. 【Result】Soil water content and soil water storage during the flowering-buds and flowering stage in the irrigation determined by computer model were significantly higher than that in the irrigation determined by soil moisture measurement. Temperature distributions along the soil profile were consistent in all treatments, with the average temperature in the topsoil rising as the soil moisture decreased. The yield under adequate irrigation was higher than that under deficit irrigation. Adequate irrigation with irrigating time determined by the computer model increased the yield by 13.7%, 12.1% and 47.6%, respectively, compared computer-aided deficit irrigation, the adequate and the deficit irrigation determined by soil moisture measurement. In terms of water use, the computer-aided deficit irrigation was most efficient.【Conclusion】In Cele oasis area, the computer-aided deficit irrigation can save water and increase cotton yield, and hence is the most suitable irrigation schedule. |
| Key words: irrigation schemes; soil water and heat; yield; forecasting irrigation; soil moisture irrigation |
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