Greenhouse Watermelon Crack Prevention
Inquiries: I am a farmer in Zhangye County. The greenhouse watermelon I planted has become a big fist. However, in recent days, many fruits have started to crack from the flowering umbilicus. What should an expert do?
Answer: In the fruit development stage, if the soil moisture is insufficient, the fruit enlargement will be hindered, and the fruit enlargement period will not be able to lack water. If the watering technique is unreasonable, the soil moisture will increase sharply, and the peel will be tight and cause cracking; if the fruit In the early stages of development, when it encounters low temperatures, it develops slowly, and the sudden increase in temperature in the shed can also cause fruit cracking. In fruit enlargement, overgrowth of plants can also cause cracking.
Control measures: 1. In the greenhouse cultivation of watermelons, should pay attention to ventilation, reasonable control of temperature, in particular, to prevent the night temperature is too low, resulting in hardening of the peel. The recent sudden drop in temperatures around the country is very detrimental to the cultivation of watermelons in the greenhouse, and we must pay attention to insulation. Insulation methods: First, to increase the cover; Second, wheat straw or straw in the watermelon groove; Third, in the greenhouse hanging incandescent lamps or light bulbs to increase light. 2. Irrigation fertilizer during fruit enlargement must pay special attention to irrigation techniques. Irrigation must be a sunny ditch irrigation under the film, should not be cloudy snow and flood irrigation. And irrigation water should be warmed up in the shed beforehand. If the ditch or well water is directly introduced into the shed, irrigation will lead to a sharp drop in the ground temperature, and physiological wilting of plants will result in fruit cracking. 3. Top dressing should be dominated by potassium fertilizer during fruit enlargement, and excessive nitrogen topdressing should not be applied. Potassium fertilizer is a potash fertilizer crop. Potash fertilizer not only promotes fruit enlargement, increases sugar content, but also improves the toughness of the peel and supplements the nutrients needed for fruit enlargement. Excessive use of nitrogen fertilizers tends to promote overgrowth of vines, compete with fruit for water nutrients, and cause fruit cracking.
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