1. Reasonably adjust the light and temperature in the shed. Illumination is a key factor in determining the temperature in the shed, so adjusting the illumination and regulating the temperature are consistent. When the temperature in the shed exceeds 35 °C and lasts for more than 2 hours, the flower bud differentiation of the vegetables will be hindered, resulting in poor flowering and fruit setting, falling flowers and fruit.
2. Rational use of growth regulators. In the seedling stage of 3~4 leaves, in order to promote the differentiation of female flowers, it is possible to spray ethephon to promote the differentiation of female flowers, but it should be noted that lower concentrations should be used when the summer temperature is high. After planting, in order to control the plant growth, it can be sprayed 500 times or more than 1500 times to regulate the vegetative growth and reproductive growth of vegetables, and improve the fruit setting rate of vegetables.
3. Pay attention to the management of fertilizer and water in the late spring vegetables. 1. In summer, the temperature is high, and it should be watered in time. In the later stage of vegetable growth, high-nitrogen and high-potassium fertilizers can be applied with water to promote the growth of plants and fruits, and the water-soluble fertilizer can be applied. 2. Foliar spraying of foliar fertilizer containing trace elements such as boron and calcium can play a role in maintaining flowers and fruits.
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