Study On Water Consumption Law And Irrigation Schedule Of Potato Under Drip Irrigation In Northern Xinjiang

In response to the national call for potato main grain,based on the existing potato irrigation methods and irrigation systems in Xinjiang,the whole growth period of drip irrigation potatoes in Northern Xinjiang was continuously observed,and the effects of irrigation times with different irrigation quotas on potato physiological indices and water consumption law under the ecological environment of Northern Xinjiang were studied.The effects of different color plastic film on potato physiological index and water consumption law were studied.The optimal irrigation quota for drip irrigation,the most suitable plastic film and the water consumption law in growth period were summarized,which provided a theoretical basis for the optimization of local potato drip irrigation system.The experiment was conducted in the water conservancy Laboratory of Xinjiang Water Conservancy and Hydropower School in Urumqi City from March to May 2017.In the first experiment,the designed irrigation quota was 300 m3/hm2,375 m3/hm2,450 m3/hm2 and 525m3/hm2.Each irrigation quota was divided into three irrigation times,7,9 and 11,respectively.Test two set up 4 treatments(A1 coated white film,A2 black film,A3 blue coating,A4 no coating).The test results show that:(1)Under the condition of test 1 drip irrigation,four irrigation quotas(300m3/hm2,375 m3/hm2,450 m3/hm2,and 525m3/hm2)were used.When the irrigation quota was equal to less than 450m3/hm2,the potato yield increased as the irrigation capacity increased.The potato yield of 11 times of irrigation was the largest under certain irrigation quota.(2)It can be seen from the law of water consumption of potatoes that the evapotranspiration was not large in the early stage,but decreased sharply in the mature stage with the increase of plant growth.The water consumption during the whole growth period was as follows:tuber swelling stage>budding stage>seedling stage>tuber ripening stage>germination stage,and the total water consumption during the whole growth period was 210 mm to 560 mm.(3)Irrigation quota is 450 m3/hm2,irrigation 11 times,irrigation water 6 days,the highest yield is the best treatment.(4)In experiment 2,under different color film mulching conditions,the order of physiological indexes from high to low was:covering blue film>covering black film>not covering film>covering white film.The total water consumption of treatment with black film was the least.