一、化瓜的原因保护地栽培西葫芦，因光照不足，光合效率低，生产物质少，对地下部分配更少，而地上部要保证非生产器官的养分，雌花和幼瓜因供给养分极少，甚至得不到养分而黄化、脱落称化瓜。造成化瓜的原因有以下几点：１．花粉发育不良和不授粉保护地中温度低，湿度过... First, the melon The reasons for the protection of cultivated zucchini, due to lack of light, photosynthetic efficiency, less production material, with less distribution of the ground, and shoots to ensure that non-production organs of nutrients, female flowers and cucumbers due to very little supply of nutrients , Not even nutrients and yellow, shed melon. The reasons for the melon are the following: 1. Pollen dysplasia and non-pollination protection in the low temperature, humidity ...