PP_(333)又名多效唑、氯丁唑,是一种新型植物生长延缓剂和广谱性杀菌剂,在农作物、花卉及果树上应用取得了良好效果。PP_(333)在黄瓜上使用效果也很明显,但最佳使用方法尚不清楚。为此,我们于1996年春季以新泰密刺及津研7号黄瓜为试材,研究了PP_(333)在黄瓜上叶面喷洒的适宜浓度及适宜时期。一、浓度试验 PP_(333)喷洒浓度包括100×10~(-6)、200×10~(-6)300×10~(-6),以清水为对照。结果表明,PP_(333)抑制黄瓜营养生长,浓度越高,效果越明显,处理植株明显矮化,叶片数减少,叶片小而厚,叶色加深,茎加粗,第一雌花节位降 PP_ (333), also known as paclobutrazol and chlorbutadiazole, is a new plant growth retarding agent and broad-spectrum fungicide and has achieved good results in crops, flowers and fruit trees. PP_ (333) cucumber effect is also very obvious, but the best method of use is not clear. Therefore, in the spring of 1996, we studied the suitable concentration and appropriate period of spraying PP_ (333) on the leaves of cucumber with Xintailingchu and Jinyan 7 cucumber. First, concentration test PP_ (333) spray concentration including 100 × 10 -6, 200 × 10 -6 -600 × 10 -6, with water as a control. The results showed that PP 333 inhibited the vegetative growth of cucumber. The higher the concentration was, the more obvious the effect was. The treated plants were dwarfed, the number of leaves was reduced, the leaves were small and thick, the leaf color was deepened,