Strengthen insulation measures. Temperature is an important factor to ensure good coloring of tomato. When the temperature is 18～26°C, tomato coloring is better. When it is higher than 32°C, the formation of lycopene is hindered to affect coloration. When it is lower than 12°C, it cannot be normalized.

Science fills light. In the deep winter, grass cover should be as early as possible to cover the late cover, in order to extend the tomato's light exposure time. After snow stopped in cloudy snow weather, under the premise of ensuring that the temperature in the shed does not decrease, weeds should be uncovered to make vegetables more visible. In order to ensure that the vegetables have sufficient light, a light curtain can be added to the wall at the usual time. In addition, the dust on the film should be wiped in time, and the photosynthetic nutrient film fertilizer should be sprayed to help the plants absorb a lot of light fertilizer, light energy, light, compatible with conventional fertilizers, and nutrient supply to plant growth and development to the limit. When the tomato is nearly mature, the leaves around and below the fruit can be removed. The diseased leaves must be removed in time to promote the normal coloring of the fruit.

Apply potassium and boron fertilizers in a timely manner. Potash is good for tomato coloring, but it should be given in advance. Because of the slow effect of potassium fertilizer after application, if the tomato coloring period is supplemented, it will often not obtain the desired effect. In the flowering, young fruit period, the expansion of the timely spraying fruit Zhuang Ti Ling, enhance the quality of pollen fertilization, cycling fruit set rate, promote fruit development.

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