| Field trials are conducted to study water deficiency and compensation effect and the calculus regressive function of complementary irrigation and yield of potato in the arid area in central Ningxia.The results show that, as for the same irrigation amount, tuber initiation and bulking stages are the stages of complementary irrigation with the most yield increase and water supply efficiency;using different irrigation amount at the tuber initiation stage, both the yield and water supply efficiency are the largest under the irrigation amount of 3 or 4kg per time per plant.To carry out complementary irrigation with optimum amount at proper stages is an effective way for saving water, increasing yield and using complementary water efficiently. |