Unsuitable temperature is the main cause of poor coloring of tomatoes. Tomato prefers a cool and dry climate. The temperature difference between day and night during the flowering period is greater. The lower the night temperature is, the lower the flower bud differentiation is. The lower the first inflorescence, the lower the flowering number is. The suitable temperature for germination is 28°C to 30°C. It is not easy to germinate if the temperature is lower than 10°C or higher than 40°C. 15 °C ~ 30 °C flowering period is appropriate, below 15 °C or higher than 35 °C, poor flower development and affect the results. The fruit coloring was best when the temperature was between 18°C ​​and 26°C. When the daily temperature was above 32°C, the fruit growth and ripening were fast, and the formation of lycopene was obstructed to affect the coloration. When the temperature is too low, it will also seriously affect the coloring of the fruit. At present, if the insulation effect of the greenhouse is not good, if the temperature of the greenhouse is lower than 12°C, normal coloring cannot be performed. Second, improper management of fertilizers and water can also affect the normal color transformation. Again, poor ventilation and light transmission can also affect the normal coloration of fruit.
The following problems should be noticed when using chemicals for red: Redness is not too early: Generally, redness is best when the fruit is fully grown. If the fruit is still in the mature period, not fully grown up, eager to urge red prone to uneven coloring of the phenomenon of stagnation. The concentration of the agent should not be too high: most of the reds used for tomato use 40% ethephon, 4 kilograms for each 50 milliliters of ethephon plus water, and be used after mixing. If the concentration of the liquid is too high, the leaves of the plant's base will be damaged, causing the leaves to yellow and produce obvious symptoms of drug damage. Each time the number of red fruits per plant should not be too much: the red fruit of each plant is usually 1 to 2 at a time. Because a single plant has too much red fruit at one time, the plant is susceptible to phytotoxicity when the dose is too large. The liquid should not be contaminated with the leaves: If the liquid is contaminated by the leaves, it will cause the leaves to yellow. The specific practice of red reminder: dip the liquid with a small sponge and apply the surface of the fruit. You can also wear a cotton glove dipped in liquid and apply the fruit surface.
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