不同灌水下限对黄瓜穴盘苗生长及生理指标的影响

为了给黄瓜工厂化穴盘育苗适宜灌溉下限指标提供参考，该文采用醋糟基质为穴盘育苗基质，以‘津优1号’黄瓜为材料，研究了以基部供水为灌水方式，不同灌水下限处理对黄瓜穴盘苗干物质积累、根系活力、光合能力及叶绿素荧光参数的影响。共设4个处理，灌水下限分别为基质饱和含水率的65%、55%、45%、35%。结果表明，以相对含水率55%作为灌水下限的黄瓜穴盘苗干物质积累量、主根长、根系活力，光合能力均显著高于其他处理，相对含水率为45%的下限处理处理次之，在基质相对含水率为45%～55%的下限处理范围内，有利于黄瓜穴盘苗生长，可以作为以醋糟为基质的黄瓜穴盘育苗的灌溉下限指标。

Effects of irrigation threshold on growth and physiological characteristics of cucumber plug seedlings

In order to provide irrigation references for industry culture of cucumber plug seedings, with cucumber (Cucumis sativus L.) variety Jinyou 1 as test material, the effects of different irrigation threshold treatments on dry matter accumulation, root activity, photosynthesis, chlorophyll fluorescence parameters were studied by using vinegar residue as plug seedling substrate. The experiments were conducted with four treatments with the irrigation threshold at 65%, 55%, 45%, 35% of the relative water content of medium respectively. The results showed that when the irrigation threshold was 55% of the relative water content of medium, the accumulated dry matter, length of taproot, root activity of seedlings and photosynthetic capacity were greater than those of seedlings under other irrigation threshold, followed was the 45% treatment. So it was suggested that 45%-55% of the relative water content of medium can be the optimum irrigation threshold in cucumber plug-seedlings raising.