First, rational fertilization. Flowering faces are prone to occur under conditions of high nitrogen, insufficient phosphorus and potassium, and lack of boron. If the nutrition is excessive, the chlorophyll content increases, and the formation of lycopene is inhibited, and a large number of yellow spots appear on the tomato fruit surface. Such as boron, potassium deficiency, poor nutrition delivery, fruit necrosis brown. If the plant is prematurely decayed, it is easy to cause large macules and green stripe spots due to the formation of lycopene during the process of reddening of immature fruits. It is recommended that the base fertilizer of vegetable growers be dominated by organic fertilizers, and various nutrients should be reasonably matched.
Second, temperature regulation. The tomato fruit surface temperature of more than 32 °C is not conducive to the synthesis of lycopene, the peel will remain green or brown. Below 8°C, the formation of lycopene is disturbed and destroyed, and no longer turns red at the appropriate temperature afterwards. High night temperature and high respiratory intensity are 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 of 25 ~ 30 °C, night temperature 13 ~ 17 °C.
Third, light water regulation. When the light is too strong or too weak, it affects the color change. However, when the soil is dry and the evapotranspiration is large, the roots supply nutrients, water, and poor fruit color. 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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