This is mainly caused by physical obstacles: First, nitrogen fertilizer is applied to the base fertilizer to promote the growth of the zucchini, and the area of ​​the leaves is increased and the shade is severe. The second is that the temperature in the greenhouse is too low or too high. Third, there is insufficient moisture or humidity in the greenhouse. In such an environment, the vitality of pollen and style will be greatly inhibited. To this end, the following four aspects should be taken for prevention and control. First, improve the drainage and irrigation conditions in the shed to achieve water drainage, dark water can seep. When you start squashing, if you experience a drought for about 10 days, then furrow irrigation, but you must prevent flooding. Second, increase the application of phosphorus and potassium fertilizer is usually sprayed once every 5 to 7 days 0.2? 0.3% of potassium dihydrogen phosphate solution. Third, the implementation of artificial pollination every day at 9:10 am when the male flower open peak period, the removal of male flowers, go to their corolla, the anthers gently coated on the stigma of the pistil, a male flower can grant 3 female flowers. 4. Hormone treatment First, use 20-40 mg/L of 2,4?D in the morning of flowering. Apply liquid brush to the pedicel or stigma and ovary, but keep the liquid from splashing on the stem. Leaves on. The second is to spray 40-50 mg/l tomato spirit on female styling. The third is to remove old leaves and remove stray flowers. The foot and leaves of the base should be properly removed. At the same time, excessive female flowers and excess male flowers should be supervised.
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Greenhouse squash only spent no cause and treatment