First, prevention by species selection. The tomato "flower face" is related to the breed first. Different varieties have different resistances. When cultivated, try to choose the species with low flower face rate.
Second, prevent through reasonable fertilization. In the case of high nitrogen, phosphorus and potassium deficiency, boron deficiency can easily occur. First, if the vegetative growth is excessive, the chlorophyll content increases, which inhibits the formation of lycopene and causes a large number of yellow spots on the tomato fruit surface. Second, the lack of boron and potassium causes poor nutrient transport, and the fruit is necrotic and brown due to lack of nutrients. Thirdly, during the late growth period of tomato, the plants exhibited premature senescence, which could easily result in the mature fruits. In the process of reddening, due to insufficient nutrition supply, the formation of lycopene was small, and large patches of yellow spots and green stripe appeared. It is recommended that the base fertilizer for vegetable growers be dominated by organic fertilizers, and various nutrient elements should be properly matched.
Third, prevention through temperature regulation. Relevant data show that the tomato fruit surface temperature exceeds 32 °C, is not conducive to the synthesis of lycopene in the fruit, resulting in residual green or brown skin. Below 8°C, the formation of lycopene is disturbed and destroyed, and it is no longer turning red at the appropriate temperature afterwards. In addition, the night temperature is too high, respiratory intensity, is not conducive to the accumulation of nutrients, manifested as poor fruit development. Therefore, pay attention to the appropriate temperature in the development of tomato fruit, to control the temperature at 25-30 °C, the night temperature at 13-17 °C.
Fourth, through the light moisture prevention. Light and moisture affect tomato photosynthesis and transpiration. If the light is too strong or too weak, it will affect the color change. When the soil is dry and the evapotranspiration is large, the roots supply nutrients and water, and the fruit color is poor. Farmers can improve the ventilation and light transmission through pruning. However, at high temperatures, do not let the sun shine directly on the fruit. Take care to keep a leaf above the fruit. Watering to see dry see wet degree, to avoid roots, root damage.
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