论文部分内容阅读
1981～1983年,笔者对甜橙结果树的需水指标进行了田间和盆栽试验,通过年生长期中土壤和植株的水分动态变化及其不同控水量对植株的生长反映,可以看出:8～10月土壤含水率的高低对果实的第三次生长高峰有直接影响,该时期植株根系分布层的土壤含水率应在20～25％（即田间持水量的78％以上）;土壤含水率低于20％,可作为生长期灌水的土壤水分指标;叶片水势在-7.09巴、叶片水分饱和亏达6％,可作为生长期灌水的生理指标。
From 1981 to 1983, the author conducted field and pot experiment on the water requirement of sweet orange fruit trees. Through the dynamic changes of soil moisture and water content in plants during the annual growth period, The soil moisture content in October had a direct impact on the third peak of fruit growth. The soil moisture content of the root distribution layer should be 20-25% (that is, more than 78% of field capacity) in this period. The soil moisture content was low At 20%, it could be used as soil moisture index for irrigation in growing season. Leaf water potential was -7.09 bar and leaf water saturation loss was 6%, which could be used as physiological index of irrigation in growth period.