4. Management of haze and low temperature and low sunshine weather. Haze weather and continuous cloudy weather can easily cause insufficient light, and can easily induce outbreaks and epidemics of pests and diseases. Countermeasures: First, try to fight for scattered light, as long as the temperature is not very low, you must open the grass curtain to see the light, and do not cover the curtain; the second is to clean or rinse the dust and grass residue on the shed film in time to increase the light transmittance of the film. Pruning branches and branches in time to remove old leaves; third, light supplementary temperature lamps can be turned on at the same time, hang reflective screens to increase northern light, artificially increase temperature and supplement light; fourth, reduce or stop watering and topdressing to avoid crop roots; sixth, use aerosol Or dust agent to control humidity and disease; Fifth, pick melons and fruits in time to reduce nutrient consumption, and properly spray foliar fertilizers to enhance the stress resistance of plants.

5. Remedial measures after shed vegetables are frozen. One is the temperature rise slowly, and the temperature rise cannot be closed immediately to avoid the necrosis of the frozen vegetable tissue due to the rapid rise in temperature; the second is artificial water spray to increase the air humidity in the shed, stabilize the temperature of the shed, inhibit the dehydration of the frozen tissue, and promote the tissue absorption ; The third is to cut off the frozen stems, leaves and fruits in time to prevent the tissue from becoming moldy and diseased and causing disease; the fourth is to apply quick-acting fertilizers, 0.3% urea + 0.2% potassium dihydrogen phosphate or other foliar fertilizers for foliar spraying ; Fifth, spray some protective agents and medicaments, such as abamectin, in time to prevent diseases and cure insects.

Field management measures for open field vegetables in winter

The overwintering vegetables in the open field in Shaanxi mainly include garlic, onion, spinach, lettuce, peas and other cold-resistant vegetables. The following points should be paid attention to in production:

1. Pour antifreeze water to increase cold resistance. According to the soil moisture, combined with plant growth conditions, water overwintering water at appropriate time to improve crop resistance to cold.

2. Temporarily set up wind barriers to reduce cold wind attacks. At the windward position of the vegetable fields with conditions, corn stalks or other crop stalks can be used to temporarily set up wind barriers to reduce the impact of cold wind on vegetables.

3. Check the mulch to prevent it from being damaged by wind. If the mulch is laid in the open field, if the coverage is not tight, it will be easily blown by strong winds in winter and will not have the effect of increasing temperature and moisture. Therefore, before the arrival of severe winter, check the mulch coverage of vegetable fields and properly compact with soil to avoid strong winds. Scratch the mulch.

4. Spread crop stalks or decomposed organic fertilizers, and keep them warm. In winter in garlic and spinach fields, sprinkling corn, wheat and other crop stalks, or decomposed cow dung, chicken dung, etc., can not only play a role in insulation, but also promote early spring and win high yield.

Zhengzhou Delong Chemical Co., Ltd. is a plant growth regulator production base in China, established in 2009, specializing in the production of plant protection products. If you have any questions, please feel free to contact us any time.