The low fruit setting rate and difficult fruit setting are the most prominent problems in the production of summer vegetables, mainly caused by the following four reasons.
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Flower bud differentiation is blocked. This is the primary reason why the summer vegetables are difficult to sit on. The temperature in summer is high. When the seedlings are nursed, the shade net should be covered to cool down, and the temperature should be kept at 22 °C ~ 28 °C to prevent high temperature from inhibiting flower bud differentiation. After the vegetable seedlings have 2 true leaves, spray potassium dihydrogen phosphate (300 times solution) and add more than 1.8% sodium nitrophenolate (6000 times liquid) to adjust the growth of the seedlings and enhance the disease resistance of the seedlings. During the nursery period, depending on the growth of the plant, it is decided whether or not to spray the promoter to control the growth of the plant, and to ensure that the flower bud differentiation during the seedling period can proceed normally.
High temperature is often seen in high-temperature vegetable production at temperatures above 35 °C. Too high a temperature will reduce the adhesion of pollen to the stigma, affect the pollen germination and the elongation rate of the pollen tube, resulting in poor fertilization, causing a large amount of flower fruit to fall off and producing a large number of deformed fruit. Therefore, strengthening the cooling measures to control the shed temperature within the range of suitable vegetable growth is a key measure to increase the fruit setting rate of vegetables.
Nutrient overgrowth, small temperature difference between day and night, high night temperature, high soil moisture, and excessive use of nitrogen fertilizer are all causes of excessive vegetative growth and insufficient reproductive growth. Production can be sprayed with appropriate concentration of auxin and naphthalene acetic acid for control to promote the transformation of vegetative growth to reproductive growth.
Boron deficiency in boron-deficient soil, coupled with high temperature, will inhibit the absorption of boron by plants. If boron fertilizer is not replenished, flower bud differentiation is hindered, which is not conducive to fruit setting. During the flowering and fruiting period, 600 times of borax or 1200 times of speed borax should be sprayed to increase the fruit setting rate of vegetables. (念é›)
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