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What are the key management points for garlic under plastic mulch during the green-up stage?

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1. Clean the plastic mulch surface to increase its light transmittance. The key to garlic green-up is temperature, and management during this period focuses mainly on raising soil temperature. For garlic covered with plastic mulch, coverings on the film such as leaves, completely dead garlic leaves and dust should be removed as early as possible to clean the film surface, so as to increase light transmittance and raise soil temperature. Damaged plastic mulch should be repaired promptly to increase heat preservation and warming effects and promote early green-up of garlic. 2. Open and clear ditches. Garlic roots are not tolerant of wet conditions; waterlogging in the field during spring rain can easily cause root rot, and drought can also affect normal garlic growth.

1. Clean the plastic mulch surface to increase its light transmittance. The key to garlic green-up is temperature, and management during this period focuses mainly on raising soil temperature. For garlic covered with plastic mulch, coverings on the film such as leaves, completely dead garlic leaves and dust should be removed as early as possible to clean the film surface, so as to increase light transmittance and raise soil temperature. Damaged plastic mulch should be repaired promptly to increase heat preservation and warming effects and promote early green-up of garlic.

2. Open and clear ditches. Garlic roots are not tolerant of wet conditions; waterlogging in the field during spring rain can easily cause root rot, and drought can also affect normal garlic growth. Ditches must be opened and cleared so that water can drain away when there is excess and irrigation can be applied when there is drought. At the same time, do a good job of earthing up around the roots.

3. Remove weeds promptly. Warmer temperatures favor weed growth. Weeds not only compete for soil nutrients but also push through and tear the plastic mulch, seriously affecting garlic growth. Weeds should be removed promptly and eliminated while still young and tender.

4. Strengthen fertilizer and water management. For garlic covered with plastic mulch, watering and topdressing can be done at noon after Awakening of Insects (Jingzhe), applying 25 kg per mu of nitrogen-phosphorus-potassium compound fertilizer with the irrigation. Do not apply ammonium bicarbonate or urea with the irrigation. After irrigation, cultivate promptly to raise soil temperature and protect roots and promote seedling growth. If special drought conditions occur, one watering can be given in late March. In principle, do not water too early, otherwise it may easily cause disease or secondary growth of garlic. Then carry out shallow hoeing to loosen the soil, raise temperature and preserve soil moisture. If leaf tips turn yellow around Qingming, carry out a second topdressing promptly and promptly increase the number of waterings, generally watering once every 10 to 15 days, to promote plant growth.

5. Strengthen pest and disease control and improve garlic stress resistance

Due to the influence of temperature, to prevent pest and disease outbreaks in garlic, after garlic enters the green-up stage at the end of March, choose a sunny afternoon for foliar spraying with Yingtianji Kang 500-fold solution or high-lipid film 800-fold solution, to promote early root growth, prevent late spring cold, and improve stress resistance. For plots without disease, apply protective treatments; for diseased plots, apply both protective and curative treatments, and spray once generally with a fungicide, plant growth regulator and foliar fertilizer, such as Yingtian No. 2 450-fold solution, to promote robust garlic growth. In plots with severe disease, avoid early watering for green-up; delay watering time according to weather and soil moisture conditions, to provide a good environment for garlic root regeneration and cultivate robust plants.

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