Low fruit setting rate and difficult fruit setting are the most prominent problems in vegetable production in summer. There are four main reasons for this.

Flower bud differentiation is hindered This is the primary reason why it is difficult to set fruit in summer vegetables. In summer, the temperature is high, and shade nets should be used to cool the seedlings during the nursery period. The temperature should be maintained at 22 to 28°C to prevent the high temperature from inhibiting flower bud differentiation. After two true leaves in the vegetable seedlings were sprayed with potassium dihydrogen phosphate (300 times liquid) and mixed with more than 1.8% of the mixture of sodium nitroprusside (6,000 times liquid), the growth of the seedlings could be adjusted, and the disease resistance of the seedlings could be enhanced. During the nursery period, depending on the plant growth, it is determined whether spraying the mechanoceptin to control the plant leggy and ensure that the flower bud differentiation at the seedling stage can proceed normally.

High-temperature summer vegetables are often seen at high temperatures above 35°C. If the temperature is too high, it will reduce the adhesion of pollen and stigma, affect the pollen germination and the pollen tube elongation rate, resulting in poor pollination and fertilization, resulting in a large number of fruit and fruit off, and produce a large number of malformed fruit. Therefore, strengthening the cooling measures and controlling the greenhouse temperature within the range suitable for the growth of vegetables are the key measures to increase the fruit setting rate of vegetables.

Overgrowth of nutrients The small temperature difference between day and night, high night temperature, high soil moisture, and excessive use of nitrogen fertilizer all contribute to the excessive growth of nutrient and reproductive growth. Production can be sprayed with suitable concentrations of midgets and naphthalene acetic acid to control and promote vegetative growth to reproductive growth and transformation.

Boron deficiency in the soil, coupled with high temperature, will inhibit the absorption of boron by plants, if the boron is not supplemented, flower bud differentiation is hindered and is not conducive to fruit set. Flowering and fruit setting should be sprayed with 600 times borax or 1200 times the speed of boron, to increase the fruit set rate of vegetables.

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