Recently, the first fruit of autumn tomatoes that were planted earlier is about to enter the coloring period. At this time, many vegetable farmers start to have headaches. Poor coloring of tomatoes occurs frequently. So how to take effective measures to help the coloring of tomato fruits evenly? In view of the coloring problem that is most concerned by vegetable farmers who grow tomatoes, the author now summarizes four measures for your reference.
1. In terms of temperature, tomato coloring is mainly based on 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.
2. During the coloring period of ventilated and translucent tomato fruit, ensure sufficient light to promote the color change of the fruit. 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 on the grass must be removed. Try to remove the cover as early as possible to increase the light time of the tomato fruit.
3. In terms of fertilization, fertilization is also an important factor that affects the coloring of tomatoes. Unreasonable application of fertilizers will seriously affect the coloring of tomato fruits. For example, if there is too much nitrogen, green shoulders will occur; when boron is deficient, the shoulders will remain green and necrotic spot. Therefore, pay attention to reasonable fertilization when fertilizing. Generally, boron fertilizer needs to be added once at this time. Use about 1 kg of borax per mu. If the base fertilizer is applied with boron fertilizer, use less. In addition, when the tomato fruit enters the swelling period, it should 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), with 5-7.5 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.
4. In terms of watering, the soil should not be too dry during the coloring period of the tomato fruit. At this stage, depending on the weather conditions and soil moisture, just water it once every 7-10 days.
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