关键词: 低山丘陵区, 低山丘陵区, 不同月份, 土壤水分

Abstract: In order to provide theoretical and practical references for phosphorus application in dryland, the authors studied the effect of water supply and phosphorus application in different depths on phosphorus efficiency and grain yield of winter wheat. Two water treatments [entirety moist (W1) and moist in subsoil (W2)], three P treatments [no P (CK), surface P (SP) and deep P (DP)] and two wheat cultivars [droughtsensitive‘(Xiaoyan22’) and drought-tolerant‘( Changhan58’)] were designed. The results showed that the effect of phosphorus application depth on root phosphorus efficiency ratio, phosphorus utilization ratio, PFPP and yield of winter wheat was different between different cultivars. Under the two water treatments, phosphorus utilization ratio and PFPP of DP treatment were significant lower than that of SP treatment of‘Xiaoyan22’, while the difference of root phosphorus efficiency ratio and yield was not significant; under W1 treatment, the indexes except root phosphorus efficiency ratio of DP treatment were significantly lower than that of SP treatment, while all the indexes of W2 treatment increased. The study suggested that deep application of phosphorus fertilizer could increase the phosphorus absorption and utilization capacity of drought-tolerant winter wheat variety, then increase phosphorus utilization ratio and yield.