作物非充分灌溉适宜土壤水分下限指标研究进展

从三个方面对非充分灌溉技术体系中土壤水分下限指标进行了讨论:①土壤水分下限的概念;②影响土壤水分下限的主要因素;③土壤水分下限对作物水分生产效率和作物产量的影响.认为研究中存在的主要问题有:土壤水分下限值的研究目前还集中在大田粮食作物及部分经济作物,有关瓜果蔬菜作物的土壤水分下限值有待研究;以往对土壤水分下限值的研究较少考虑到作物的旱后补偿或超补偿效应.

Studies on optimum low limits of soil moisture index for deficit irrigation of crops

The paper mainly discusses three aspects of the low limits of soil moisture in the research of deficit irrigation.First is what is the low limits of soil moisture,how it comes and why it is important.Secondly,the mainly factors that affect the low limits of soil moisture,such as the kinds of the crops,the growth period of the crops and the soil texture and soil bulk density.Thirdly,the effect of the low limits of soil moisture to the yield of the crops and to the WUE.Some main problems were also discussed as follows,old research about the low limits of soil moisture mostly focused on the food crops and some economic crops,actually the melon and fruit and vegetable crops should be pay more attention.And compensatory effect of plant has not been considered in the research of the low limits of soil moisture.