Preventive measures: (1) Control of seedling age. The seedling age of common early maturing cultivars is controlled at about 80 days, 90-100 days for late-maturing varieties, and 25 days for autumn tomatoes. (2) 10-30 days before planting, do a good job of fertilizing the soil, covering the roof membrane and skirt membrane, and draining the ditch around the shed to ensure that the humidity in the shed during the colonization is low and the temperature is high, which is conducive to easing seedlings. (3) Control the amount of nitrogen fertilizer, deep sorghum cultivation, and promote root growth. (4) Timely and appropriate pruning, leafing, and spraying with growth regulators such as tomato spirits to promote fruit setting and inhibit excessive vegetative growth. (5) Ventilate after keeping the seedlings at a certain temperature to reduce the humidity in the shelter. After flowering and fruit setting, the skirt film was lifted and the bottom wind was released. At night, when the outside minimum temperature was higher than 15°C, it was ventilated overnight and the film was removed in the hot season. (6) Control fertilizer and water. Normal flowering fruit before the application of water, fruiting, depending on the amount of topdressing. Remedial measures: (1) Deep cultivator cuts part of the root system and controls growth. (2) Spraying paclobutrazol, diaminos and other growth regulators. (3) Hand pinching seedlings. Select crazy plants, count down from the top of the seedlings, and knead to the water between the lower nodes of the third leaf to make the conveyed tissues temporarily damaged and sprout seedlings. After 3-5 days, the wounded part can heal and recover. Normal growth.
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How to prevent tomato growers in greenhouses
The colony of tomatoes is easy to grow long after planting, manifested as thick plant stems, large and thick leaves, buds, flowers are thin and weak, inconclusive; or fine stalks, prominent stem sections, thin and pale leaves, buds, flowers thin, falling flowers and falling fruit . The main reasons for the tomato growers in the spring greenhouse are excessively wet soil, partial application of nitrogen fertilizer, excessive colonization, poor ventilation and light transmission, or even continuous rain leading to high air humidity and insufficient illumination. After the fall, the tomato is mainly due to the high temperature, nitrogen fertilizer is too much, and there is no timely colonization and prone to leggy.