东北黑土区调亏灌溉对水稻前期生长发育的影响

Effects of regulated deficit irrigation on earlier period growth of paddy rice in phaeozem area

为了探明东北黑土区调亏灌溉对水稻苗期生长的影响,通过在黑龙江省庆安县进行田间试验,控制水稻不同生长期田面水层与土壤水分指标,对分蘖末期叶面积指数和根系状况进行调查,分析不同下限控制水分对水稻生长的影响。结果表明,灌溉水对水稻叶面积指数和根重的生长存在正效应,灌水过多或下限过低均会影响水稻的生长,水稻分蘖期前中后低的调亏灌溉管理可使水稻生长处于最佳生长状态。

In order to prove the effects of regulated deficit irrigation in the earlier growth period of paddy rice in the phaeozem area in the northeast of China,the field experiments were conducted in Qingan County and the field water depth and soil moisture were controlled in different growing periods of paddy rice. Through the investigation of leaf area index and the root system conditions in last tiller stage,it analyzed that the influence of the lowest limits of water on paddy rice growing. The results showed that the amount of irrigation water had a positive effect on both of leaf area index and root weight. Excessive irrigation or lower limit value would affect the crop normal growth,and the regulated deficit irrigation management which was moderate deficit in the earlier tiller stage and lower limit in later tiller stage were the best for paddy rice growth situation.