First, prevent empty fruit. 1 Select the variety. The winter greenhouse tomato can choose those varieties with strong anti-low temperature ability, tight flesh, and medium-sized fruits. Such as from the introduction of beauty in Israel, Canada and Asia. 2 Reasonable fertilization. Plant flowering and fruit enlargement period, the appropriate amount of nitrogen fertilizer to prevent excessive nitrogen fertilizer causes plants to grow. Phosphorus and potassium fertilizers should also be applied at the same time to promote nutrient transfer to flower and fruit parts and reduce the incidence of empty fruit. 3 leaf spray fertilizer. Foliar application of 0.3% -0.5% potassium dihydrogen phosphate, to supplement the plant's demand for phosphorus, potassium. 4 regulate temperature. In the case of a cloudy snow day, when the temperature in the shed is not reduced, the light should be exposed to prevent leggy growth. In the case of continuous cloudy days, warming measures should be taken in the shed to prevent the root system from being damaged due to freezing and affecting the plant's absorption of water. When the greenhouse is watered in the winter, it should be selected on sunny days, and the water temperature should be controlled at 10°C or more. Second, prevention and treatment of premature aging. 1 Reasonable rotation. The most effective way to prevent premature senility caused by continuous cropping is to implement non-solana fruit vegetables for more than 3 years of rotation, strive for changes in pods, vary from year to year, and maintain a stable soil structure. 2 increase organic fertilizer. Under the precondition of ensuring the required nitrogen, phosphorus, and potassium during the growth of tomatoes, decomposed organic fertilizers, biological bacterial fertilizers, and trace elements such as copper, iron, and zinc are also added to increase soil organic matter and improve soil permeability. Tomato roots create a good environment for growth. 3 Cultivate strong seedlings. Warm winter shed tomatoes for 40-50 days, according to estuary vacant morning and evening arrangements for reasonable nursery time. The seedlings were separated when the tomatoes had 3 true leaves. The spacing was 1010 cm. 4 control leggy. In order to prevent seedlings from growing in length, it is better to adopt physical methods such as increasing the area of ​​the nursery bed, appropriately controlling the watering, increasing the spacing between the seedlings and other measures. When hormones are used to correctly use the concentration, attention should also be paid to the use time. Generally, the best effect is to be used before the four true leaves of the seedlings. 5 planting sugar. When tomatoes are planted, white sugar is added to the planting hole. The dosage of each hole is 10-15 grams, which is not only beneficial to the production of adventitious roots in tomatoes, but also promotes slow seedlings and prevents premature aging. Third, falling flowers and falling fruit. 12,4-d. 2,4-D can stimulate plant growth at low concentrations, prevent flowering, and inhibit growth at high concentrations, but the use of slightly higher concentrations tends to produce malformed fruit. The application concentration is 10-20 mg/kg, when the temperature is high, the concentration is low, when the temperature is low, the concentration is high, and the red food additive is added as a mark to avoid the repeated deformity caused by the flowering. Silk flowers should be opened on the same day as appropriate, too early and late will reduce the treatment effect, small buds should not be handled. It is best to leave flowers in the middle to stay in the middle according to the number of fruit per ear. This ensures that the fruits are in order. When smearing, apply a small amount of 2,4-d solution with a brush to smear the detached layer of the stalk and prevent it from dripping on young leaves and growing points. 2 tomato spirits. Tomatoes can decorate flowers and paint flowers, and can also be sprayed directly. It is not easy to produce malformed fruit and is safe to apply. Its use concentration is 30-50 mg/kg, which is also adjusted with the temperature. When applying, in strict accordance with the requirements of the instructions for preparation, the solution will be poured into a small bowl, add red, will open a 3-4 flower spikes dip, gently shake the inflorescence, so that excess solution into the bowl . However, after the initial use, the fruit enlargement was slower and gradually accelerated after half a month. 3 High yield agent No. 2. High-yield agent No. 2 combines the advantages of tomato spirit and 2,4-d, so the effect of flower preservation and fruit protection is good, but the effect of applying the flower stalk is not good and it needs to be sprayed. Its use concentration is 20-30 mg/kg. That is, use a small sprayer to spray on the flower head. When spraying, cover the growth points and leaves with a piece of paper to cover the flowers with drops of water. Fourth, prevention and treatment of diseases. The major diseases of tomato in winter greenhouses include tomato late blight, tomato virus disease, tomato gray mold, and tomato early blight. 1 tomato late blight (also known as the disease). The selection of disease-resistant varieties, a reasonable rotation; control of temperature and humidity, can not flood irrigation, timely ventilation and humidity, reduce air humidity; timely pruning, hiccups, removal of the old leaves, to improve light conditions. If a diseased plant is found, remove it immediately and use a chemical to control it. Spray it with 45% chlorothalonil smoke agent or 5% chlorothalonil dust agent 1 kg per 667 square meters, or use 75% chlorothalonil wettable powder 500 times. Liquid, or 72% DuPont Ke Lu 500 times, spray once every 7 days, even spray 3-4 times. 2 tomato virus disease. The use of trisodium phosphate to purify virus from the seed band; strengthen field management to avoid uneven dryness and humidity in the field; balanced fertilization and cultivation of robust plants; timely prevention and control of insect pests such as aphids to reduce the degree of infection. When the seedlings were colonized, they were sprayed with weak virus attractants or inoculated with attenuated vaccines, or with a 1.5% solution of Lingzhi emulsion 1000 times, or a 20% virus A wettable powder 500 times for prevention. In the early stage of disease, 1000 times potassium permanganate was used to prevent and treat. 3 tomato gray mold. Use sterile soil to prepare nutrient soil. The bed surface is disinfected with 50% carbendazim 500 times. Strengthen ventilation management to reduce air humidity and prevent condensation at leaves. Air humidity should be kept below 80% to avoid cloudy watering or After the watering, it was even cloudy; clean the garden, timely removal of diseased fruit, diseased leaves. Prior to colonization, spray the seedlings with 50% fast keratin 1500 times solution or 50% carbendazim 500 times to prevent problems. 4 Tomato early blight (also known as ringworm disease). Seed treatment, crop rotation, reasonable close planting, strengthen field management, appropriate watering, timely ventilation and humidity removal; increase application of phosphorus and potassium fertilizer, improve plant resistance, timely removal of diseased fruit, diseased leaves. For every 667 square meters available 45% chlorothalonil or 10% fast-king smoke agent 200-250 g fumigation; or 50% carbendazim wettable powder 500 times, thiophanate-methyl 800 times, 50% fast Ling 1000 times liquid spray control, spray once every 7 days, and even spray 3-4 times. Fifth, pest control. The main insect pests in winter greenhouses include roundworms, whiteflies, and spotted fly. 1 locust. In the winter shed, yellow boards are used to trap and kill locusts and other pests. That is, use a 10020 cm board with a yellow paint and a coat of engine oil. Between the rows or between the plants, 30 to 40 pieces per 667 square meters above the top of the plant. When the board is full of insects, repaint it. A layer of motor oil, usually 7-10 days 1 time. Or with a width of about 10-15 cm silver gray film hanging around, spaced about 10 cm, drive flooding. 2 B. tabaci. With 10% imidacloprid wettable powder 3000 times or 25% Praxanthine wettable powder 1000 times spray control. 3 spotted lilies. It is sprayed with a 1.8% Epheddine emulsifiable concentrate 3000-5000 times solution or a 25% Nongjing Net Emulsion 1500 times solution. Kitchen Products,Customized Bamboo Straw,Bamboo Straw With Logo,Bamboo Straw With Brush Yangzhou Tongfun Red International Trading Co,Ltd. , https://www.i-ecbio.com