| The scheduling of drip irrigation was studied in Yuli County,Kuerle in 2004 with three irrigation treatments: 345 mm,420 mm and 505 mm.It was found that,when the irrigation ration was 45 mm in florescence stage,the soil moisture in 040 cm layer increased sharply to 90%;after one day it dropped to 70%,and the water loss was up to 20 mm;after four days it dropped to 60%,and the crop was affected by water stress.The water demand of cotton is about 625 mm for drip irrigation under plastic film in south Xinjiang.According to the arrangement of irrigation and water demand of cotton,the rational irrigation scheduling is: 40 mm for every four days in bud stage;50 mm for every seven days in florescence stage;and 35 mm for every seven days after flourishing boll stage. |