Now, it's just a few cold days. If it is not properly managed, tomatoes can easily be stained poorly. The vegetable growers can use the following four measures to promote tomato coloring.
Strictly control the temperature. Temperature is an important factor to ensure good coloring of tomato. According to the biological characteristics of tomato, when the temperature is 18°C-26°C, the coloration of tomatoes is better. When the temperature is higher than 32°C, the formation of lycopene is hindered to affect coloration. When the temperature is lower than 12°C, Can not be normal coloring. Therefore, greenhouses in the winter must be strengthened insulation measures, it is best to control the daytime temperature in the shed at 25 °C -30 °C, night temperature control at 14 °C -15 °C, day and night temperature control at 12 °C -15 °C, to avoid tomatoes Discoloration failure due to temperature discomfort.
Increase lighting. 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 addition, the dust on the film should be wiped in time to increase the transmittance of the film.
Increase ventilation and light transmission. Plant density should not be too large, we must ensure that the shed ventilation and light transmission is good, so that the chance of plants appear brown fruit will be reduced. Through the timely removal of excess branches, old leaves, diseased leaves, residual leaves and hanging reflective screens on the back wall, etc. to increase the lighting time of fruit in the shed and promote fruit coloring.
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. Potassium fertilizer can be applied with water in the initial stage of tomato fruit, and 8-10 kilograms per acre is appropriate. The lack of boron in tomatoes often causes the fruit to appear as green husks in a batch, that is, residual green patches remain on the shoulders of the fruit or in the vicinity of the fruit pedicle and remain unchanged. Should apply 0.8-1 kg of boron fertilizer per acre when applied to basal fertilizer, or spray boron fertilizer 3 times when the first spike flower is open. You can use 1500 times of quick boron or 600 times of borax to spray to promote tomato coloring. Uniform.
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