In March, the protected tomato will enter the middle and late stages of growth. In this period, the first to second fruits will be matured, and the third to fourth fruits will be expanded and flowering. The vegetative growth and reproductive growth will be important. Management of temperature and humidity adjustment, fertilizer and water supply, plant adjustment and pest control to ensure that tomatoes can produce more results, achieve good results, and strive for good economic benefits.
1, temperature and humidity adjustment. The key point of adjustment is to pay attention to timely ventilation, heat preservation and dehumidification. The temperature in the shed is 20-28 °C in the middle of March, and the temperature can be appropriately increased when the fruit is ripe; the humidity should be 60-80% of the maximum water holding capacity of the soil. In particular, care should be taken to avoid the effects of “cold spring†on tomato growth.
2. Water and fertilizer supply. March is the vegetative growth and reproductive growth of tomato and the advancement period. The water needs a large amount of fertilizer. It should be poured in small water to ensure the water supply. It is best to use drip irrigation and watering.
Topdressing should adhere to the principle of “balanced fertilization, a small number of timesâ€. It is best to combine the watering and chasing the fruit fertilizer, and apply 7 to 10 kg of urea and 10 kg of potassium sulfate. It can also be combined with disease prevention and pest control for foliar topdressing, sprayed with Huilongbao 500-600 times liquid, or 0.5% urea and 0.3% potassium dihydrogen phosphate mixture for 3 times to promote plant robustness and fruit enlargement. Fruit yield and quality. After entering the results period, carbon dioxide fertilization should be carried out, and 20 bags per acre are suspended.
Balance fertilization. According to the soil nutrient content and plant growth status, the top dressing can be applied 10-25 kg of high-potassium instant fertilizer per hectare (nutrient content nitrogen 12-15%, potassium 35% or more), but the nitrogen, phosphorus and potassium content should be selected. 1 to 0.3 to 1.8 fertilizer, and must ensure potassium content.
3, preserve fruit and fruit, adjust plants. When the lateral branches between the leaves are 3 to 5 cm long, they are removed in time. Generally, each plant leaves about 5 spikes of fruit, and 4 to 5 fruits per ear, and the rest of the flowers should be removed in time to avoid consumption of nutrients. When the plant grows 5 spikes, it is necessary to pick the top and the old leaves in time to promote fruit ripening, improve ventilation and light transmission conditions, and reduce disease.
4. Pest control. In March, the main pests and diseases of tomato in protected area include gray mold, epidemic disease, umbilical rot, whitefly, and sassafras, which should be timely controlled according to the condition of the disease. For the control of gray mold, 50% of procymidone can be used for 50-75 grams, or 50% of Kaiser 16-20 grams, or 42.4% of Jianda 20-30 ml. For the prevention and treatment of epidemics, 18.7% Kate (enoylpyrazole ester) 16-24 g, or 58% metalaxyl manganese zinc 50-60 g; prevention of umbilical rot can be used with Dyle calcium 800 times liquid or 0.5% chlorine Calcium solution sprays new leaves and newly emerged inflorescences; control of whitefly can be used in 24% mu of 8 to 10 ml; control of tea yellow can be used in 20 to 30 ml of gold, or 1.8% of avermectin 2000 times liquid. The amount of liquid spray for acre is 30 to 40 kg.
5. Harvest at the right time. When the tomato fruit meets the criteria for commodity maturity, it should be harvested in time. Handle gently when picking to prevent mechanical damage or rotten fruit during storage.
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