Management according to the appearance of pepper plants in greenhouse

Whether the greenhouse pepper is suitable for temperature, light, soil nutrition and moisture from seedling stage to full fruit stage can be shown from plant appearance. The cotyledons are small and slender at seedling stage, which is caused by high temperature at night and small temperature difference between day and night. The symptoms of insufficient light are more obvious. If they are not adjusted in time, hypocotyls will elongate and cotyledons will fall off early. After two cotyledons are unfolded, the temperature at night decreases and the temperature difference between day and night increases, which can make the cotyledons wider and the hypocotyls about 3 cm long.

Two true leaves are fully unfolded, and when the third true leaf is unfolding, flower buds form inside the plant and enter the reproductive growth stage. The night temperature is too low to easily form three-branched branches, sometimes one branch has two branches combined to become incomplete branches. Under the condition of lower temperature and good nutrition, it can grow healthily and form three-branched branches. It is difficult to form three-branched branches under high temperature or insufficient.g illumination. Therefore, it is necessary to control the appropriate temperature during the day, lower the temperature appropriately at night, uncover the cover early and cover late, strive for more sunshine, and expand the nutrient area of seedlings appropriately. With the increase of leaf number and leaf area, the number of branches and flowering increased. If nitrogen fertilizer is excessive, the upper young leaves appear uneven and the leaves shrink.

Sometimes this state occurs due to red spider damage. The middle part of the plant has prominent ribs, forming a compound bottom shape, and then the leaves of the plant are twisted, the leaves are relatively large, and the petiole is also long. From the leaf shape, nitrogen and phosphorus fertilizer appropriate, leaf tip was long triangle; potassium sufficient, leaf width was slightly round. The petiole is long at high temperature; short at low temperature and the leaves droop. When soil moisture is insufficient, petioles bend and leaves droop; when soil moisture is excessive, petioles open.

The whole leaf droop is caused by the weak root system, most of the nutrients and growth hormones accumulated above the root neck, so the petiole grows upward and bends. In addition to excessive soil moisture, excessive fertilization and root diseases also occur. Poor growth of plants, yellowing from lower leaves, in addition to nitrogen deficiency, is the result of damage to roots.