【摘要】 根据不同年型旱地春小麦田区定位试验的对比分析，认为水分供应不足仍是影响旱地作物生产力的主要因子。通过施肥虽可降低土壤水分的无效消耗，提高作物的产量和水分利用率，但这一措施在旱年收效甚微。试验表明，水分供应正常年与水分供应严重不足之旱年相比，前者产量、耗水量和水分利用效率分别为后者的１６．７、２．５和４．８倍，而施氮的边际产量、边际水分利用效率之最大值和边际值＞０的施肥量前者为后者的５倍和１．９倍。更多还原

【Abstract】 It is considered that deficit water supply is still an important factor af-fecting dryland crop production based on the analysis of fixed position testing data in dryland spring wheat fields in different types of rainfall years.Although fertilization can lower the non-available soil moisture ciency,this measure may produce only a little in dry years.The data also indicated that in comparison of the normal years of water sup-ply with the dry years of deficit water supply,crop yields,water consumption and water use efficiency of the former were 16.7 times,2.5 times and 4.8 times as much as thoseof the latter respectively.In the case of the boundary yields with N application,the max-imum value of boundary water use efficiency and amount of fertilizer application with the boundary value over zero,the former is 5 times and 1.9 times as much as the latter.更多还原