Regulating temperature tomato coloring is mainly due to lycopene, and the formation of lycopene is limited by temperature, too high or too low will affect. Studies have shown that the optimal temperature for lycopene formation is 19°C-24°C, and the greenhouse temperature lower than 14°C or higher than 32°C will affect the normal production of lycopene. Therefore, in this critical period, vegetable farmers should adjust the shed temperature at 22℃-26℃ during the day and 15℃-20℃ at night.
During the coloring period of ventilated and light-transmitting tomato fruits, ensure sufficient light to promote the color change of the fruits. To ensure the ventilation and light transmission in the shed, it is necessary to remove the extra branches, leaves, diseased leaves, and old leaves in time, remove the dust and pollutants on the shed film in time, and ensure sufficient light conditions. In addition, the sheds that have been covered with grass must be removed. Try to remove the cover as early as possible to increase the light time of the tomato fruit.
Reasonable fertilization and fertilization is also an important factor affecting tomato coloration. Unreasonable application of fertilizer will seriously affect the coloration of tomato fruit. For example, if there is too much nitrogen, green shoulder fruit will occur; when boron is deficient, the shoulder will remain green and there will be necrotic spots. Therefore, pay attention to reasonable fertilization when fertilizing. Generally, you need to add boron fertilizer once at this time. Use about one kilogram of borax per mu. If you use boron fertilizer as base fertilizer, you can use less. In addition, when the tomato fruit enters the swelling period, it must be topdressed in time. It can be flushed with a fully nutritious and fully water-soluble compound fertilizer (15:15:30 or 20:10:30), using 10-15 kg per mu. At the same time, The foliage can also be sprayed with foliar fertilizer containing boron and potassium dihydrogen phosphate to fully supplement nutrients and avoid poor fruit coloration due to unbalanced nutrient supply.
The soil should not be too dry during the scientific watering of tomato fruits. It is advisable to see dry and wet, so it is suitable for small water and frequent watering. At this stage, depending on the weather conditions and soil moisture, it is sufficient to water it once every 7-10 days.
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