Consultation: I am a farmer in Zhangye. The greenhouse watermelon I planted has become a big fist, but many fruits have cracked from the flowering navel in recent days. What should experts do?
Answer: In the fruit development stage, if the soil moisture is insufficient, the fruit expansion will be hindered, and the fruit expansion period can not be lack of water. If the watering technology is not reasonable, the soil moisture increases sharply, and the skin is very tight, it will cause cracking; if the fruit In the early stage of development, low temperature and slow development, and the sudden increase in temperature in the shed can also cause cracking; when the plant grows too much during the fruit expansion period, it can also cause cracking.
Control measures: 1. In the cultivation of watermelon in the greenhouse, pay attention to ventilation and reasonable control of temperature, especially to prevent the temperature at night is too low, resulting in hardening of the peel. The recent sudden temperature drop in various places is very unfavorable for greenhouse watermelon cultivation, so we must pay attention to heat preservation. Ways to keep warm: One is to increase the mulch; the other is to spread wheat straw or straw in the big ditch of the watermelon; the third is to hang an incandescent lamp or light bulb in the greenhouse to increase the light. 2. Special attention should be paid to irrigation technology during irrigation and top dressing during fruit expansion. Irrigation must be under a ditch irrigation under the film on a sunny day, avoid cloudy and snowy days and flood irrigation. And irrigation water should be preheated in the shed in advance. If the ditch or well water is directly introduced into the shed for irrigation, it will lead to a sharp drop in ground temperature, the occurrence of physiological wilting of the plant, and fruit cracking. 3. Potassium fertilizer should be used as the top dressing during the fruit expansion period. Do not apply excessive nitrogen fertilizer. Watermelon is a crop that likes potash fertilizer. Potash fertilizer can not only promote fruit expansion and increase sugar, but also improve the toughness of the peel and supplement the nutrients required for fruit expansion. The excessive use of nitrogen fertilizer will often promote the overgrowth of branches and vines, compete with the fruit for water and nutrients, and will also cause cracking.
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