How to prevent yellow leaves of vegetables in greenhouses

Vegetable cultivation in greenhouses often occurs when vegetables just after planting have yellowing of new leaves and wilting of plants. In severe cases, the trees die, and cucumbers are the most serious. After vegetables are planted, the reason why new leaves turn yellow and plants wilt and die is mainly due to improper management after planting that causes root damage. The following work should be done:

There are two main reasons for the root injury of overwintering vegetable roots caused by root promotion: one is that some vegetable farming uses unreasonable fertilizer, and the one-time use is too large or the use of insufficiently decomposed manure causes the vegetable to burn roots. At this time, water should be watered as soon as possible to dilute the soil Concentration of medium fertilizer; second, excessive watering at low temperature causes retting. At this time, ventilation should be strengthened, the humidity in the shed should be reduced, and the field loosening should be combined to improve the air permeability of the soil and promote the early emergence of new roots. For particularly severely injured plants, rooting agent and cytokinin can be irrigated.

Raising leaves is an important measure to accelerate plant recovery while promoting roots. First of all, we must supplement the nutrition of the leaves. When vegetable roots are injured, their ability to absorb nutrients is weakened, and plants are bound to show symptoms of iron deficiency and zinc deficiency. You can spray 2-3 times with zinc and iron-containing foliar fertilizer, or spray cytokinin mixed nucleotide foliar fertilizer. . In addition, pay attention to preventing and controlling leaf diseases. Especially after the root system of vegetables is injured, the growth of the plant will become weaker, and the disease resistance will be reduced accordingly. Therefore, the leaf diseases should be prevented as soon as possible. You can spray with chlorothalonil 600 times of 800 times of flumazin.

The root system of tip-open leaf vegetables is injured, and the top tips must not grow long, so it is recommended that vegetable farmers take timely measures to solve it. It can be sprayed with foliar fertilizer and plant growth regulators, such as Aidoshou or Brassinolide.

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