Key points for management of low temperature greenhouse vegetables in winter

[Main points of winter low-temperature greenhouse vegetable management work] In winter, as the light time becomes shorter and the light intensity becomes weaker, the photosynthesis of vegetable plants will be correspondingly weakened, and the photosynthetic products will be reduced. Moreover, as the temperature in winter drops, the ground temperature in vegetable greenhouses begins to decline, which may cause problems such as the growth of vegetable plants and poor fruit growth. How should it be solved? What management should be done for low temperature vegetables in winter?

First, control the temperature

1. Adjust the temperature in the greenhouse to the suitable growth range of vegetables. The thermometer in the greenhouse can be hung on the upper part of the plant. The air temperature in different parts of the day is basically positively correlated with the height. Generally, the ground temperature can be 3-7 Â°C lower than the temperature at the growth point. If the temperature at the growth point of the crop is about 34 Â°C, the temperature at the branches and leaves of the crop is just between 27-30 Â°C, which is the optimum temperature for photosynthesis. Within the scope.

2, greenhouse cultivation, covering the mulch, soil moisture supply is sufficient, thereby accelerating the transpiration of greenhouse vegetable leaf leaves, reducing leaf temperature, its leaf temperature is generally 3-5 Â° C lower than air temperature, controlled in the appropriate temperature range of photosynthesis within.

3, increase the temperature inside the shed, which is conducive to the improvement of the ground temperature. If the ground temperature in the vegetable greenhouse is low, it will not only be detrimental to the growth and development of crop roots, but also cause poor absorption of roots of vegetable crops, which may cause a variety of physiological diseases. In general, the temperature of 5 cm deep in the soil during the day can be 5-7 Â° C lower than the temperature in the shed, and the ground temperature at 5 cm deep in the night soil is 3-5 Â° C higher than the temperature.

Second, reasonable control of greenhouse vegetable humidity

1. Control the number of times the vegetables are watered, reduce the humidity in the shed, but ensure that the water can meet the needs of crop growth.

2. Cover the greenhouse with no drip film to reduce air humidity.

3, ridge cover the mulch, maintain soil moisture, reduce evaporation, reduce air humidity

4, vegetables should be reasonably densely planted, in order to facilitate ventilation and ventilation, reduce air humidity.

5. Before covering the mulch after planting, timely cultivating the loose soil after watering can reduce evaporation and maintain soil moisture.

6. Under the premise of ensuring the temperature of greenhouse vegetables is appropriate, timely ventilation and discharge of moisture.

Third, improve the ground temperature of greenhouse vegetables

In the process of cultivating vegetables in greenhouses in winter, it is best to use transparent mulch film, which not only can improve the ground temperature, but also has the herbicidal effect. At the same time, it is necessary to do a good job of smashing the vegetable plants and adjusting the management of the field structure.

In addition, in addition to the above-mentioned management work in the low-temperature greenhouse vegetables in winter, it is necessary to supplement the vegetables with nutrients as early as possible, and do a good job in the management of pests and diseases.

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