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地膜覆盖是圆葱增产的一种有效措施,但是,有些地方的地膜覆盖的圆葱,在收获前发生葱头腐烂,严重的地块一畦中有70％的葱头烂损,致使减产减收。那么,造成葱头腐烂的原因是什么呢?又有什么方法防止呢。在正常的情况下,圆葱在生长过程中,地膜自始至终应紧紧覆在畦面上,而葱头的大部分或全部应露在地膜上面。如果葱头收获前,地膜腾起(拱起),整个葱头被盖在地膜下面,这样遇雨后,腾起的薄膜与畦面间形成了高温多湿的条件。另外,此时圆葱地上叶片的蒸腾作用很弱,因而葱头在膜下受潮受热而腐烂。
Film mulching is an effective measure to increase the yield of onion. However, in some places the mulching mulch has onions decayed before harvesting, and 70% of the scalds in serious land plots cause the loss of yield. So, what is the cause of rotting onions? And what other ways to prevent it. Under normal circumstances, the onion in the growth process, the film should be tightly covered in the 畦 surface, and most or all of the onions should be exposed in the film above. If the onions were harvested before the mulching (arching), the whole onion was covered underneath the mulch, which created a condition of high temperature and humidity between the rising film and the pommel face in case of rain. In addition, at this time on the leaves of the onion transpiration is very weak, so the onion in the film damp heated rot.