In March, the protected tomatoes will enter the middle and late stages of growth. During this period, the first to the second fruits will be listed on the market one after another. The 3rd to 4th sets of fruits will be expanded and flowering, and the vegetative growth will be of equal importance. The four aspects of temperature and humidity control, fertilizer and water supply, plant adjustment, and pest and disease control, to ensure that tomatoes can be more fruitful, fruitful, and strive for good economic benefits.
1, temperature and humidity adjustment. The focus of adjustment is to pay attention to timely ventilation, heat preservation and dehumidification. The temperature in the shed is about 20 to 28°C in mid-March. When the fruit matures, the temperature can be appropriately increased. It is advisable to maintain the maximum water holding capacity of 60 to 80% of the soil. In particular, care should be taken to avoid the effect of “cold spring†on tomato growth.
2, water, fertilizer supply. March is the tomato's vegetative growth and reproductive growth and development, demand for water, fertilizer, water should be poured, to ensure water supply, it is best to use drip irrigation watering methods, avoid flooding irrigation.
Topdressing should adhere to the principle of “balanced fertilization, a small number of timesâ€. It is best to use a combination of watering to stimulate fruit fertilizers, and 7 to 10 kg of urea and 10 kg of potassium sulfate. Can also be combined with disease prevention and pest control for foliar dressing, with Huilongbao 500 ~ 600 times liquid, or 0.5% of urea and 0.3% of potassium dihydrogen phosphate mixture sprayed 3 times, in order to promote robust plants and fruit enlargement, improve Fruit yield and quality. Carbon dioxide fertilizer should be applied after entering the result period, and 20 bags per mu.
Balanced fertilization. According to the soil nutrient content and plant growth status, timely top dressing can be carried out with 10 to 15 kg of high-potassium fast-dissolving fertilizer (12 to 15% for nutrient content, and 35% or more for potassium) per acre drip irrigation; however, the content of N, P and K should be selected. A fertilizer ratio of 0.3 to 1.8, and must ensure that the potassium content.
3, protect fruit and fruit, adjust the plant. When the lateral branches between the leaves grow to 3 to 5 centimeters in length, they are promptly removed. Generally, about 5 panicles per plant are left, and 4 to 5 fruit per ear are left. The remaining fruits and fruit should be removed in time to avoid consumption of nutrients. When the plant grows 5 panicles, the top and old leaves must be picked in time to promote fruit ripening, improve ventilation and light transmission conditions, and reduce disease.
4. Pest control. The major pests and diseases of tomatoes in protected areas in March include gray mold, epidemic disease, umbilical rot, whitefly, and tea radix, which should be controlled in time according to the conditions of diseases and insect pests. Prevention of gray mold can be used 50% of procymidazole 50 ~ 75 grams, or 50% Kaiser 16 ~ 20 grams, or 42.4% Kinda 20 ~ 30 ml. The prevention and control of disease can be used with 18.7% Kate (enoic pyrazole ester) 16-24 grams, or 58% metalaxyl manganese zinc 50-60 grams; to prevent umbilical rot can be used to wear 800 times or 0.5% chlorine Calcium solution spraying new leaves and emerging inflorescences; control whitefly can use 24% mu Twang 8 ~ 10 ml; prevention and treatment of tea glutinous rice can use 20 ~ 30 ml per mu, or 1.8% avermectin 2000 times liquid. Mu spray liquid volume 30 to 40 kg.
5, timely harvest. When the tomato fruit reaches the standard of commodity maturity, it should be timely harvested. Take care when picking to prevent mechanical damage or rot during storage.
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