Tomatoes ripen at a temperature of 18 ℃ ~ 26 ℃ when the fruit coloring is the best, the day temperature is higher than 32 ℃, fruit growth and ripening fast, the temperature is too low will affect the formation of lycopene is blocked and affect the coloring. Seriously affect the quality of the fruit. When the temperature exceeds 32 degrees Celsius, lycopene will not be produced, resulting in tomatoes can not be red, so reasonable control of the temperature of the planting in order to allow tomatoes to produce enough lycopene, so that this tomato red.

Too much fruit retention not only can't make all the fruits swell and color, but also cause the whole plant malnutrition, so it is recommended that the bottom of the small size, and difficult to accept the light of the fruit removed, the number of red fruit should not be large at a time. Single-plant red fruits are generally 1-2 per time is good. Because a single plant red fruit is too much, the amount of drug is too large, easy to produce drug damage. Tomato ripening balanced fertilization or not will also affect the speed of tomato color change. Some tomato growers in the early tomato planting to tomatoes using excessive nitrogen fertilizer, resulting in tomatoes after the melon fruit, especially tomatoes ripening late nitrogen fertilizer is still relatively adequate.

The lack of some important trace elements, like boron, calcium, copper, molybdenum, manganese and other elements, will be unfavorable to its coloring. So if the tomatoes do not change red, but also to consider whether it is improper fertilization, timely fertilization of its in order to ensure that the tomatoes high. Potassium fertilizer should be used as a base fertilizer or the results of the early flush, for example, in the early expansion of the fruit, we can use the "Dianzun" + "energy-saving potassium" for use in conjunction with the use of potassium fertilizer can be not only can be supplemented in a timely manner.

Planting too dense light will be insufficient, it will affect the tomatoes on the color, the higher the temperature of the tomatoes will be more red. Also, tomatoes into the ripening period, will secrete a kind of lycopene, when lycopene more and more, tomatoes will be more and more red tomatoes turn color good or bad, can not only from the ripening period of this time to manage, and should pay attention to the whole of the management of a detail, especially in the light, temperature, and the management of a combination of in order to play a relatively good role.