Effect of saline drip irrigation to soil water and salt distribution and cotton yield in Northern Shandong Plain
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Key Words: saline drip irrigation  full film mulching  dynamics of water and salt  cotton yield
孙泽强1,董晓霞1,王学君1,郑东峰1,董 亮2,刘兆辉3 (1.山东省农业科学院农业资源与环境研究所 农业部山东耕地保育科学观测实验站, 山东 济南 250100 2.山东省农业科学院农业资源与环境研究所 农业部黄淮海平原农业环境重点实验室 山东 济南 250100 3.山东省农业科学院 山东 济南 250100) 
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      The Northern Shandong Plain is an important production base for food, cotton and oil in Shandong Province. The rational using micro salt water and saline water is an urgent issue. Through the field experiment with small plots, taking the fresh water drip irrigation as the control group, set up the treatments with different saline water drip irrigation, research the impacts of saline drip irrigatio n to soil water and salt distribution and cotton yield under the condition of full film mulching. The results showed that: The emergence irrigation can be significantly reduced the soil EC value in main root zone of cotton with the reduction rate between 26.8% to 29.0%. The saline drip irrigation can reduce the absorption of soil moisture by cotton, the mainly effected soil layers between 40 to 100 cm. The more of the irrigation water saline degree, the greater impact will be. Compared with the fresh water drip irrigation, drip supplemental irrigation with salinity less than 6 g·L-1 has no significant effect to cotton yield. While drip irrigation with the salinity of 8 g·L-1 can significantly reduce the cotton yield in the less precipitation years. From the accumulation of soil salt, the drip irrigation using the salinity less than 6 g·L-1, does not cause the salt accumulation in main root zone of cotton, through the leaching soil salt by the Yellow River water and precipitation in summer. This research results can provide the scientific basis for using the saline water in Northern Shandong Plain.