Before the arrival of the low temperature days, spray anti-disease or foliar fertilizer in advance to enhance the low temperature resistance of vegetables. In continuous snowy weather, the temperature inside the shed is low, and measures should be taken to increase the temperature inside the shed. Conditional heating can be done by heating the fire, heating the furnace to increase the temperature in the shed, and ensuring the safety of vegetable plants over the low temperature season.
In the case of cloudy days, the grasshoppers should be exposed early in the morning, make full use of the scattered light to increase the illumination of the greenhouse, and add light to the reflective curtain on the back wall of the greenhouse; clean the greenhouse film in time to ensure that the membrane is clean and clean, and increase the light transmittance. It is also possible to install fluorescent lamps, biogas lamps, etc. in the shed to enhance the photosynthesis of plants. In order to reduce the occurrence and development of vegetable diseases in the facility, the indoor air humidity should be reduced as much as possible. In the winter, watering should be strictly controlled. When the crops are dry, you can choose to spray small water under the membrane on sunny days. When using drugs to control vegetable diseases, try to use dust or aerosol.
Timely remove the old leaves of the lower part of the plant, enhance the direct sunlight to the ground, increase the ground temperature, promote the growth of new roots, reduce the transpiration of the foliage, and prevent excessive water loss and wilting. On a continuous cloudy day, after the sudden change of the weather, do not completely uncover the grasshoppers, prevent the stagnation of the saplings in the weather caused by the severe weather, and the temperature in the shed will increase suddenly, so that the seedlings will increase the water transpiration and cause wilting. The way to manage, that is, the interval is uncovered, the cover is turned back, and the cover is repeatedly uncovered, and the plants are no longer wilted, and after the growth is resumed, the grasshoppers are all uncovered. For sheds that are less chilled, it is necessary to remove the young fruit in time to ensure the nutrients needed for plant growth, to prevent premature senescence of the plant due to low temperature and low light, and to remove the sheds that cannot be recovered in time to replant other vegetable crops.
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