There are great differences in water consumption characteristic and irrigation schedule among different stubbles of alfalfa in a year. Irrigation experiments on alfalfa were conducted under sprinkler irrigation conditions in the water-saving irrigation demonstration field in pasture of Etuokeqin County, Ordos City. The water consumptions were calculated by using the principle of water balance, and the water consumption characteristic, yield, water productivity, and irrigation schedule for different stubbles were analysed. The results show that the water consumption exhibits an increasing trend for the first stubble to the third stubble, but the water consumption intensity is the maximum in the second stubble. The alfalfa yield varisd significantly across stubbles, among which the yield is the highest in the second stubble, followed by the first one, and the lowest in the third one. The corresponding water productivity demonstrates a similar variation pattern. Under sprinkler irrigation conditions, the recommended irrigation schedule is that there are 7 irrigations in the whole growth period of alfalfa with a quota of 270-315 mm, specially, there are 3 irrigations with a quota of 120-135 mm in the first stubble, followed 2 irrigations with a quota of 75-90 mm in the second stubble, and end up with 2 irrigations in a quota of 75-90 mm in the third stubble. The results have certain significance for decision-making of multi-stubble grass irrigation and design of water-saving irrigation projects in pasture.
ZHENG He-Xiang,LI He-Ping-*,CAO Xue-Song. Water consumption characteristic and irrigation schedule for different stubbles of alfalfa under sprinkler irrigation conditions[J]. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(9): 785-789.
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