Key Points of Tomato Field Management in March
In March, tomatoes in the protected field will enter the middle and late stages of growth. In this period, 1 to 2 fruits will be matured and listed on the market. The 3 to 4 fruits will be fruit expansion and flowering. Temperature and humidity adjustment, fertilizer and water supply, plant adjustment, and pest control are four aspects of management to ensure that tomatoes can produce more fruits and produce better fruits, and strive for good economic benefits.
1. Temperature and humidity adjustment. The focus of regulation is to pay attention to timely ventilation, heat preservation and dehumidification. The temperature in the shed is 20-28 ° C in early March. The temperature can be appropriately increased when the fruits are mature. The humidity should be 60 to 80% of the maximum soil water holding capacity. In particular, care should be taken to avoid the effects of "cold spring cold" on tomato growth.
2. Water and fertilizer supply. March is the period of vegetative and reproductive growth of tomatoes. It requires a large amount of water and fertilizer. It should be poured in small water to ensure water supply. It is best to use drip irrigation, and avoid flood irrigation.
Topdressing should adhere to the principle of "balanced fertilization, a small amount of multiple times", it is best to combine watering to promote fruit fertilizer, and topdressing 7 to 10 kg of urea and 10 kg of potassium sulfate per acre. It can also be used for foliar topdressing in combination with disease prevention and insect control, spraying three times with a solution of Huilongbao 500-600 times, or a mixture of 0.5% urea and 0.3% potassium dihydrogen phosphate to promote plant robustness and fruit expansion Fruit yield and quality. After entering the result period, carbon dioxide fertilization should be carried out, with 20 bags hanging per acre.
Balanced fertilization. Topdress fertilizer in time according to soil nutrient content and plant growth status, 10 ~ 15 kg of high-potassium instant fertilizer can be applied per acre of drip irrigation (nutrient content of nitrogen: 12-15%, potassium above 35%); 1 to 0.3 to 1.8 fertilizer, and must ensure potassium content.
3. Protect the fruit and sparse the fruit, adjust the plant. When the side branches between the leaf axils reach 3 to 5 cm in length, they are removed in time. Generally, about 5 ears of fruit are left per plant, and 4 to 5 fruits per ear of fruit are left. The remaining flowers and fruits should be dredged in time to avoid consuming nutrients. When the plant grows 5 spikes, the top and old leaves must be picked in time to promote fruit maturity, improve ventilation and light transmission conditions, and reduce disease.
4. Pest control. In March, the main pests and diseases of tomatoes in the protected area were gray mold, blight, umbilical rot, whitefly, and tea yellow mite, etc., and timely control should be carried out according to the disease and insect condition. For the prevention and treatment of gray mold, 50 to 75 grams of 50% Pythium can be used per mu, or 16 to 20 grams of 50% Kaiser, or 20 to 30 milliliters of 42.4% Jianda. For the prevention and treatment of epidemic diseases, it is possible to use 18.7% Kate (enoyl · pyrazolate) 16 to 24 grams per mu, or 58% metalaxyl manganese zinc 50 to 60 grams; to prevent umbilical rot, use 800 times liquid or 0.5% of Da Le calcium Calcium chloride solution sprays new leaves and newly emerged inflorescences; 24% of acres can be used to control whitefly, 8 to 10 ml of Twang; 20 to 30 ml of golden branches can be used to prevent tea yellow mites, or 1.8% of avermella 2,000 times solution. The amount of spraying solution per mu is 30-40 kg.
5. Harvest in time. Tomato fruits should be harvested in a timely manner when they reach commercial ripeness standards. Handle with care when picking to prevent mechanical damage or rotten fruit during storage.
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