Abstract:

The yielding of Altay prairie was mainly developed on barren desert land，determination of irrigation scheduling has important practical significance on the rational exploitation of water resources, irrigation management, ecological restoration of natural vegetation and other work. This article analyzed and compared test data based on the irrigation experiment of United Nation’s "2817 Project", got spring wheat and alfalfa irrigation scheduling in the high yield initially. The results showed that, spring wheat should adopt a "less quantity and more times" irrigation scheduling, and irrigation scheduling was 433 mm and irrigation frequency was 10. Optimal irrigation quota of spring wheat before heading was 60 mm, and other reproductive stage irrigation quota was 30-45 mm. Irrigation scheduling of alfalfa mowing three times was 849 mm and irrigation frequency was 15 times,The first irrigation quota of three stubbles was 60 mm, 67 mm and 67 mm, and other irrigation quota were 40-60 mm. Studies have shown that, spring wheat achieved high yield when the soil moisture content is 70% of field water capacity, and the optimal solution of alfalfa yield was that the soil moisture content of seedling, branch extension and flowering maturity stage was 65%, 45% and 45% of field water capacity.