In winter, vegetables in greenhouses are prone to weak yellow leaves. The main symptoms are that the plant grows weak, the leaves are yellow, and the yield is low, which seriously affects the economic interests of the farmers. So what is the cause of the weak vegetable? How do we manage the weak vegetable phenomenon? The following small series will specifically talk about the causes and prevention measures of weak vegetables in vegetables.
The main reason for the weak yellowing of greenhouse vegetables:
The first reason is that the early plants have more fruits and insufficient nutrient supply, and the ground temperature is lower, and the root absorption capacity is weakened. To improve this situation, it is necessary to start from rooting, especially from the seedling stage. Cultivate strong roots.
Specific prevention measures:
(1) Pouring the first three waters and drawing them continuously
Not only vegetables in vegetable greenhouses, but also all vegetable roots have a tendency to be fertilized to water. According to this characteristic of the root system, it is necessary to guide the deep rooting of the roots. The watering in the management of the seedling period is summarized in one sentence as “fixed waterâ€. To be small, the seedling water should be large, and the water should be late." The principle that should be followed in the plan is the principle of “near the seedling, the late stage, the far side, and the initial stageâ€, ensuring that the roots are less and the soil is breathable.
(2) Covering the mulch at night
Many vegetable farmers are accustomed to covering the mulch immediately after the value is fixed. In fact, this is unfavorable for the growth of vegetables, especially vegetables with a longer wintering season. It is best to carry out the watering after the watering. The mulch should be supported by steel wire or sling, and should not be attached to the ground to avoid affecting the permeability of the soil.
(3) Do a good job in seedling control
It is necessary to know that there are few leaves in the seedling stage, less nutrients are produced, the aboveground part grows faster, the nutrients consumed are more, the nutrients obtained by the root system are relatively reduced, and the activity is weak. Therefore, the above-ground control of seedling management is to promote root growth. Especially after the setting of autumn 茬 vegetables, the temperature in the vegetable greenhouse is high, and the vegetables are prone to grow up, which affects the flowering and fruit setting in the later stage. Generally, vegetables grow to four or six leaves, which are at the beginning stage of vigorous growth. According to the growth of the plants, they can be sprayed with Shunxi, Ai Duo, etc. in advance.
The second reason is that the winter temperature is low, the fertilizer absorption rate is low, and the nutrient crops cannot be absorbed.
Specific prevention measures:
(1) Balanced fertilization. According to the demand for nutrition in different periods of vegetable growth, balanced fertilization of nitrogen, phosphorus and potassium should be applied. Nitrogen fertilizer should be changed to reduce nitrogen, stabilize phosphorus and increase potassium. Organic fertilizer, NPK and trace element fertilizer should be combined with application.
(2) Adding organic fertilizer and biological fertilizer to improve the soil and improve the buffer capacity of soil fertilizer.
(3) Then it is to control the amount of compound fertilizer, it is best to use water-soluble fertilizer, such as the water-soluble fertilizer of Hebei Mengbang, because the water-soluble fertilizer can be completely absorbed in the case of low ground temperature, and will not cause accumulation of fertilizer solution and excessive damage. root.
Other prevention measures:
1. The vegetable in front of the shed has a weak tree phenomenon. The biggest reason is the lack of temperature and light. Therefore, it is necessary to do the insulation work here. For example, if you want to cover the shed on the front of the shed at night, you need to cover the grass, or set a two-layer film on the front of the shed to not only increase the insulation effect, but also reduce the humidity in front of the shed.
2. If there is a weak tree phenomenon at the vegetable door, you can set a cotton curtain at the door of the shed, and set a buffer film to buffer the cold wind from the door into the shed to reduce the weak vegetable damage at the door of the shed. .
3, such as the greenhouse changed in the year before, may wish to open a width of 50 cm in the lateral direction of the shed, with the same length of the shed, fill the crop straw and strain, set up a straw reactor to increase the temperature here. Prevent the occurrence of weak trees.
For weak trees scattered in the shed, they cannot be ignored. If these weak trees cannot rejuvenate quickly, it is easy to become weaker under the cover of other strong trees.
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