Four measures for uniform coloring of autumn tomatoes
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℃～24℃, and the greenhouse temperature lower than 14℃ or higher than 32℃ 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 transparent 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 shed has been covered with grass, 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 that affects tomato coloration. If the fertilizer application is unreasonable, it 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 the base fertilizer is applied with boron fertilizer, you can use less. In addition, when the tomato fruit enters the swelling period, it should be topdressed in time. It can be flushed with a full-nutrient and fully water-soluble compound fertilizer (15:15:30 or 20:10:30), with 5 to 7.5 kg per mu. At the same time, The leaves 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.
Scientifically watering the soil during the coloring of tomato fruits should not be too dry, it is advisable to see dry and wet, so it is suitable for small water and frequent watering. At this stage, according to weather conditions and soil moisture, water it at intervals of about 7 to 10 days.
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