大棚蔬菜滴灌试验与耗水量估算

通过大棚条件下的滴灌灌水试验，对黄瓜，茄子的需水量，需水规律及其土壤水分状况对蔬菜生长和产量的影响进行了研究。结果表明：无论从产量还是植物株的生态考查结果来看。适宜土壤水环境对促进蔬菜生产发育有利，其中以土壤含水量达到85%左右时开始灌水至田持水量的产量最高，耗水量也最多。蔬菜的耗水量与水面蒸发力关系密切，苗期耗水量低于同期水面蒸发力，其它生育期高于同期水面蒸发力，在计算灌溉水量时，灌溉指标用土壤水分胁迫指标比用土壤水分亏缺量更能反映与作物缺水的关系。

Trickle irrigation experiment and water consumption estimation on greenhouse vegetable

Water requirement of cucumber and eggplant and the influence of soil mois ture on crop yield are studied by tric kle irrigation experiment under the con dition of greenhouse.The results sh ow:judged by both the yield and plant ecology,suitable soil moisture is very beneficial to promoting the growth of vegetables.Yields as well as water requi rement reach climax if starting irrigating when s oil moisture come down to about 80%an d irrigating to field moisture capacity.Water consumption has close relationship with water surface evaporation powe r.Water consumption in seedling period is more than water surface evaporation,while it is lesser than water surface evapora tion in other periods.When estimati ng irrigation water quantity,it' s better to use soil moisture stress i ndicators as irrigation indicator t han the quantity of soil moisture sca rcity be-cause the former can more accurately reflect the condition of crop water s carcity.