Due to the low temperature and short illumination time in winter, the normal photosynthesis of vegetables in greenhouses will naturally be affected. Especially in the case of continuous rainy days, lighting is even more important. Many farmers in the management of vegetable greenhouses in winter often only pay attention to the management of thermal insulation, but neglect the lighting requirements of shed vegetables, causing the sheds to suffer from diseases due to photosynthesis, resulting in reduced production. Recently, a farmer in Rizhao City, Shandong Province, reported that the top buds in his family's greenhouse cucumbers were wilting, the new flowering was not fruit-bearing, and the cucumber that had been caught was also growing slowly. The original greenhouse in this house was able to pick three or four hundred kilograms of cucumber a day, but in the recent past, it was able to pick one hundred thirty-four pounds and the output was greatly reduced. Another farmer reported that a similar phenomenon occurred in the tomatoes in his greenhouse. The top buds were wilting, they couldn’t hold fruit, some had gray mold, and the whole plant appeared wilting. According to the analysis of experts, the reason why this kind of disease occurs in the above greenhouses is due to insufficient light, and the photosynthesis of vegetables cannot be performed normally. A few days ago, due to the continuous cloudy days, they kept covering the grass curtains throughout the day to ensure the temperature of the greenhouses. They felt that there was no sunlight anyway and they did not uncover the straw curtains. The correct approach is: even in the absence of direct light conditions, it should be time to uncover the straw, scattered light can also make crops photosynthesis, as long as you can see the shadow of the situation, whether it is cloudy or not, should Appropriately unveiled the straw. Then there is watering in winter, avoid flood irrigation, should be less pouring, ground pouring, so as to maintain the shed gentle and reasonable humidity, humidity is too high is also a cause of the above diseases.
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