First, the multi-day rain and cold air in late April has a great impact on the growth of vegetable crops in greenhouses. In May, we must pay attention to strengthening field management: 1. Grasp the opportunity to ventilate and reduce humidity, but pay attention to the sunny days in the noon shed. High-temperature hazards, as far as possible to create a suitable growing environment for the crop. 2. When the weather is fine, use 0.2% potassium dihydrogen phosphate for foliar fertilizer in a timely manner to make the crop robust and improve anti-retrograde or disease resistance. 3. Adhering to the principle of “prevention based and comprehensive prevention and controlâ€, every day 7-10 days, alternate use of broad-spectrum pesticides such as carbendazim, chlorothalonil, etc. alternately spray to prevent diseases. Second, greenhouse cultivation, or shelter from rain cultivation of watermelon, melon, have entered the fruit-bearing period or the expansion period, should pay attention to the following points: 1, melons after the child ran out of the female flower fruit, generally leaving the main vine 12 The fruit of the vines above the festival should not be too early to avoid the vegetative growth of the plants. 2, the normal growth of watermelon is a little bit forward, if the head is almost upside down, indicating that nutrient overgrowth, through the vine on the female flower pollen can inhibit excessive vegetative growth The balance between vegetative growth and reproductive growth is conducive to fruit enlargement. 3, rainy days will reduce the vitality of watermelon pollen, while female stigma is also affected by water pollination and fertilization, so in addition to trying to eliminate stagnant water in the shed, reduce the humidity inside the shed, in the rainy day, male flowers can be collected in the early one day, After drying under a light bulb, conduct artificial pollination in the early morning of the next day to increase the fruit setting rate. 4, if the long-term rain, the soil moisture content increases, will induce the occurrence of Fusarium wilt disease (Wildworm disease), can be used wilt Ling, legislation and other dry pesticide 800-1000 times to prevent rooting. 3. According to the recent production conditions, greenhouse vegetables are sometimes improperly cultivated, causing an imbalance between the vegetative growth and reproductive growth of the plants, and the appearance of leggy, unsuited fruit, etc., should be strengthened with the use of cultivation techniques. Means to be resolved, avoid blindly using plant hormones to correct, so as not to damage the normal growth of plants, affecting the yield and efficiency. 4. Currently, in some agricultural sheds, tomato late blight and leaf mold are serious. In addition to timely removal of diseased leaves and diseased fruits, 64% anti-disease WP can be used for late blight, and 500% liquid can be used as a 72% agricola. Wet powder 600-800 times or 72% Kelu wet powder 600-800 times liquid spray; Leaf mildew with 75% chlorothalonil wettable powder or 50% carbendazim wet powder 500 times spray, if hundred Bacteria and carbendazim are not effective, and new drugs such as Garrinone can be used. The specific use method should be followed.
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