节点式渗灌温室黄瓜适宜灌水控制下限的研究

以温室栽培小区节点式渗灌灌溉试验的方法,研究黄瓜生育前期和后期不同灌水控制下限对黄瓜田间耗水量、作物产量以及水分利用效率的影响,灌水控制上限为田间持水率,计划湿润层的湿润比为0.7。结果表明,灌水控制下限土壤水吸力值与灌水量、黄瓜产量和水分利用效率的数量关系可用二元二次方程表达;黄瓜前、后2个生育期灌水控制下限土壤水吸力值分别为20 kPa及35 kPa时,可实现节水、高产和高效的同步提高。

Suitable Lower Irrigation Limit of Greenhouse Cucumber Cultivation by Node Infiltrating Irrigation

The experiment was carried out with the node infiltrating irrigation for cucumber in the greenhouse,and the whole developmental stage was divided into the earlier and the latter stages.The upper irrigation limit is field moisture capacity,and the wet ratio of planned moisture layer is 0.7.Under these conditions,it can be concluded that the relationship between the lower irrigation limits and the total water requirement,the cucumber yield and the water use efficiency can be expressed by binary quadric equation;when the optimum combination of the soil water suction of lower irrigation limits is 20 kPa in the earlier stage and 35 kPa in the latter stage,which will simultaneously realize saving water,the high production and the highly efficiency.