At present, the flowering temperature of spring-planted tomato is not stable, and the low temperature may cause the fruit to fall. The vegetable growers should strengthen the management from the aspect of fertilizer, water, pests and diseases. 1. Fertilization management: Fertilizers should be applied on the basis of sufficient base fertilizers, with particular emphasis on potash fertilizers. The base fertilizers are best used with decomposed farmyard fertilizers and superphosphate. Topdressing is applied thinly before fruit setting, reapplied after fruiting, and top dressing is performed in portions. When a flower of a spike blooms 3-4, it can be preserved with tomato spirit, etc., and the concentration is lower at low temperature. 2, water management: flowering results, plant growth needs more water, to ensure uniform water supply. Slow seedling period to the first spike fruit to sit, generally do not water, prevent cropped plants caused by falling fruit; the first ear fruit swelling, the second spike fruit to sit, increase the number of watering, timely watering when the young fruit expansion. 3, plant adjustment: non-self-sealing type of tomato can be 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. 4. Pest control: Diseases mainly include early blight, leaf mold, gray mold, and ulcer disease. At the beginning of the disease, Bordeaux's solution can be used for prevention and treatment. 70% thiophanate-methyl can be used to control 800-1000 times and 75% chlorothalonil 600 times. Insect pests mainly include Helicoverpa armigera, Pieris rapae, and locusts, etc., and Nanonong, S. sinensis and other drugs have good control effects on cotton bollworm and cabbage caterpillars, and S. utilis or worm eggs have good control effects. Aphids can be sprayed with imidacloprid.
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