Technical points of production management after greenhouse tomato planting

Watering and fertilizing

Planting water should be poured, and the seedling water should keep up. The result of the watering principle is that the fruit is not watered. Watering should be controlled after the greenhouse is deducted with the temperature. When the first ear is seated, it begins to water when it reaches the size of the thumb. When watering, avoid the flowering period of the second ear fruit, otherwise it will affect the fruit setting rate of the second ear flower. The time for watering in winter depends on the weather. After the wind turns north, there will be no wind and sunny days for a few days. The amount of watering in winter should be small, as long as the water needed for plant growth can be met, and the artificial point-point water method or the sub-film watering method is often used. Large water irrigation can cause sudden drop in ground temperature and increase indoor temperature. In the middle and late February, the climate warmed up, and the water was poured once a day on a sunny day. After the horror, look at the weather and fertilize as appropriate.

2. Top dressing outside the roots

After planting, soil topdressing is basically not carried out. Due to the limitation of the number of times of watering with water, foliar spray fertilizer is generally used to supplement nutrients and trace elements. Foliar spray fertilizer has obvious effects on adjusting plant growth potential. Before flowering fruit, if the plant is long, spray 0.5% potassium dihydrogen phosphate; if the plant growth is weak, the leaf color is dark, spray 0.5% urea, the fruit setting period and the fruit expansion period spray 0.5% potassium dihydrogen phosphate fruit setting rate High, the fruit is swollen fast. Or spray 50-100ppm boric acid or zinc sulfate. The humidity in the greenhouse is too high, and the weather is particularly cold and rainy days are generally not easy to spray. Foliar top dressing can be used in combination with pesticides, but it must be evenly sprayed and atomized to avoid causing leaf damage. The degree of spraying should be such that the leaves do not drip, and the focus is on the back of the leaves.

3. Carbon dioxide fertilization

In the cold season, the temperature is low, the ventilation is reduced, and the carbon dioxide room is deficient, which reduces the formation and accumulation of photosynthetic products. When the indoor carbon dioxide concentration is deficient, it is the strongest photosynthetic capacity of the plant in the morning. Strengthening carbon dioxide can improve the efficiency of photosynthetic capacity of the plant and reduce the phenomenon that the leaves are small and the fruit is not long. However, it is not advisable to apply carbon dioxide during the flowering period of tomato. If carbon dioxide is applied during the expansion period of the ovary fertilization fruit, the fruit filling and premature ripening will be accelerated, and the fruit volume will not reach the variety level and the yield will be reduced.