应用田测法 ,对渭北旱塬南部高原台塬过渡区 ,矮化红富士苹果需水量、需水规律及限水灌溉效应进行了研究。结果表明 ,该区矮化红富士苹果生育期总需水量为 494.8～ 5 5 2 .7m m ,其中干旱年份高于湿润年份 ;年生育期内以 6月最大 ,7～ 8月次之 ,10月最小。果实膨大和花芽分化盛期需水量最大 ,占总需水量的 41.4%～ 46 .7% ,新梢生长与果实发育前期次之 ,占总需水量的 34 .0 %～ 34 .2 % ;并得出了该区矮化红富士苹果生育期的作物系数KC值。对不同降水年型土壤水分盈亏状况与该区降水特点分析表明 ,该区 5 0 %年份降水能够满足矮化红富士苹果生长需要 ,无需灌水 ;10 %年份降水基本满足需要 ,生育期末土壤贮水基本持平 ,但由于受降雨分配影响 ,需水关键期仍需适量补充灌水 ;40 %年份降水明显不足 ,必须灌水才能维持稳产、高产。干旱年份补充灌水对当年和第二年树体生长、果实发育和产量均有显著的正效应 Field test was applied to study the water requirement, water requirement and water-saving irrigation effects of the dwarfing Red Fuji apple in the transition zone of plateau plateau in the southern plateau of Weibei Arid Highland. The results showed that the total water requirement of dwarfing Red Fuji apple in this area was 494.8-572.7m, of which the drought year was higher than the wet year; the annual growth period was the largest in June, followed by 7-8 months Month minimum. Fruit enlargement and flower buds peaked at the peak, accounting for 41.4% ~ 46.7% of the total water requirement, followed by the growth of new shoots and fruit development, accounting for 34.0% ~ 34.2% of the total water requirement. The KC of crop coefficient of dwarfing red Fuji apple in this area was obtained. Analysis of the annual profit and loss of soil moisture and precipitation characteristics in different precipitation years shows that precipitation in 50% of the year in this area can meet the growth needs of dwarf Red Fuji apples without irrigation; the precipitation in 10% of year basically meets the needs, However, due to the impact of rainfall distribution, the water supply in the key period of water demand still needs some supplementary irrigation. In 40% of the year, the precipitation is obviously insufficient and it is necessary to irrigate to maintain stable and high yield. Supplementary irrigation in drought year had significant positive effect on tree growth, fruit development and yield in the same year and the second year