Cucumbers cultivated in greenhouses or in open fields sometimes have no luster and produce a white powdery cream on the surface. This phenomenon is commonly known as "frosting fruit." Cucumber bloom is a physiological disease. The reasons are: the cultivation land is too shallow, the roots are shallow, and the absorption force is not strong; the cultivated land is large in sand, the soil layer is too thin, and the nutrient supply is insufficient; the cucumbers grow late in the growth period, and the root absorption capacity decreases; the pests and diseases are serious. Aging of plants; continuous cropping plots, malnutrition; air temperature, nighttime temperature is too high; continuous cloudy days, lack of sunshine. Due to the above factors, the nutrient production of the plant is reduced, and the respiration is enhanced, resulting in insufficient respiratory consumption and suppressed, and waxy substances are produced on the peel. Prevention measures are: 1. To avoid too much sand in the cultivation, pay attention to fertilization in the late growth period. Fertilizer application should be combined with nitrogen, phosphorus and potassium, pay attention to crop rotation. 2. The cultivation site should be deep-turned more than 30 cm. If there is no deep-turning condition, spray 200 grams of deep-cultivation, add 100 kg of water and spray the ground before planting; or, when watering, plunge into the ground without water, about 20 days, and a depth of 50 cm. Can be loose and transparent. This will promote root growth and increase absorption. 3. In the late growth period, pests and diseases should be prevented and prevented to prevent premature aging. 4. The protection site shall strengthen the ventilation and reduce the temperature to prevent the night temperature from being too high and reduce the intensity of the respiration. Pay attention to cleaning the greenhouse film in time to increase the amount of transmitted light. 5. Spray natural alizarin once every 20 days. One-hundred-thousandth of the liquid of SF 481 will once promote the photosynthesis of the leaves, produce more nutrients, and avoid the inhibition of respiration. 6. When using black pumpkin as rootstock, cucumbers tend to bloom. The use of imported Japanese pumpkin as rootstock, cucumber less frost, pay attention to use rootstock.
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