论文部分内容阅读
1.什么时间覆盖与覆盖多长时间遮阳网的用途就是覆盖大棚,达到遮强光、降温的目的。揭盖遮阳网要根据天气情况和不同蔬菜种类的不同生育期对光照强度和温度的要求,灵活掌握。一般是晴天盖,阴天揭;中午盖,早晚揭;前期盖,生长后期揭。如果是阴雨天气多,温度不是过高,在蔬菜定植后,仅在3～5天的缓苗期内覆盖遮阳网即可,若使用黑色遮阳网可仅在晴天中午覆盖。在没有必要使用的情况下,若覆盖时间过长,会影响蔬菜的光合作用,不利于蔬菜的正常生长发育。所以,遮阳网应仅在晴天中午光照最强的
1. What time to cover and cover how long the purpose of shading is to cover the greenhouse, to cover the light, cool purpose. Uncover shade net according to the weather conditions and different types of vegetables at different growth stages of light intensity and temperature requirements, flexible grasp. Generally sunny cover, cloudy expose; cover at noon, sooner or later Jie; pre-cover, the latter part of the growth of Jie. If it is cloudy and rainy, the temperature is not too high, after vegetable colonization, only 3 ~ 5 days in the hibernation period to cover the shade net, if the use of black shade net can only be covered in the sunny noon. In the absence of the need to use the case, if the cover is too long, it will affect the photosynthesis of vegetables is not conducive to the normal growth and development of vegetables. Therefore, shading net should be the strongest light at noon on a sunny day