南方气候区冬菠菜需水量分析

目的]研究南方气候区冬菠菜需水量。方法]设计3种灌水下限指标处理，分别为田间持水量的90％（处理1）、80％（处理2）和70％（处理3），每个处理设置2个重复，研究不同灌水指标下冬菠菜的需水量。分析了冬季菠菜的需水量ET；采用改进的彭曼公式计算参考作物腾发量E％，进而求出作物系数Kc；利用水面蒸发量玩计算需水系数d；并用ISD法对需水量、产量、作物系数、需水系数和叶面积作多重比较分析。结果]各处理的需水量无显著性差异，降雨对需水量的影响很大；处理1的产量和叶面积显著大于处理2、3,处理2、3之间无显著差异。结论]为节约菠菜灌溉用水和合理利用水资源提供科学依据。

Study on Water Requirement of the Winter Spinach in the Southern Climatic Region

Objective] The research aimed to study the water requirement of the winter spinach in the southern climatic region.Method] In order to study the water requirement of the winter spinach with different irrigation indice,3 different irrigation lower limits that were 90%(treatment 1),80%(treatment 2) and 70%(treatment 3) of the field moisture capacity were designed,and every disposal had 2 repeats.Water requirements were analyzed based on experiment date.The reference crop evapor transpiration was worked out based on improved equation of Penman-Montieth,then the crop coefficients were gained.Water requirement coefficients were calculated by method of pan evaporation.The water requirement,output,crop coefficient,water requirement coefficient and leaf area were compared with LSD method.Result] The results indicated that the water requirement among treatments had no significant difference,and the rainfall had great effects on water requirement.The yield and leaf area of treatment 1 were much greater than the others,but the other two treatments had no significant difference.Conclusion] The study provided the scientific basis for irrigation water of spinach and reasonably using water source.