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Spring tomato management
Temperature during the flowering period of spring planting tomato is not stable, and the low temperature may cause flowering and fruit falling. Therefore, the management of flower and fruit period should be strengthened from the aspects of fertilizer, water, pests and diseases. First, fertilizer management: Tomato is a large amount of fertilizer crops, fertilizer should be applied on the basis of sufficient base fertilizer, in particular, pay attention to potash fertilizer, base fertilizer is best to use farmyard manure, superphosphate and so on. Top dressing is to be applied thinly before setting fruit, reapply after fruiting, and top-dressing. When a flower of a spike blooms 3-4, it can be preserved with a tomato spirit, etc. The concentration varies with the temperature, and the low temperature concentration is lower. Second, water management: flowering results, plant growth needs more water, to ensure that the water supply. In general, the period from the seedling stage to the first fruit is appropriate, and watering is appropriately limited. Generally, water is not sprayed to prevent the plants from growing in length, resulting in falling fruit. The first fruit is swollen and the second fruit is sitting, increasing the frequency of watering. Immerse the young fruit when it is watering. Third, the plant adjustment: non-self-sealing type of tomato can use single stalk pruning or double stalk pruning. Take a single stalk and pruning, leave 7 ear fruit around the individual, excess removal, timely removal of lateral buds and timely sparse thinning fruit, to maintain fruit evenly. Generally, 7-8 fruits are kept per ear, and when the fruit grows to about 2 cm in diameter, the deformed fruit and diseased fruits are removed and 4-5 fruits are retained. Fourth, pest and disease control: The disease mainly has early blight, leaf mold, gray mold, ulcer disease. At the beginning of the disease, Bordeaux's solution can be used for prevention and treatment. 70% thiophanate-methyl, 800-1000 times, 75% chlorothalonil 600 times, or quick-acting spray can be used for prevention and treatment at the later stage. Insect pests mainly include Helicoverpa armigera, Pieris rapae, and aphids, which harm the leaves and fruits. Tianrun Insecticide 1 or Tianrun Insecticide 2 has better control effects on Helicoverpa armigera and Pieris rapae. The control effect is also good. Aphids can be controlled by imidacloprid or by spraying mist.