Occurrence and Control of Cold Damage of Chinese Cabbage Vegetables
First, symptoms: Cabbage, Chinese cabbage, rapeseed, and other Chinese cabbage vegetables can be chilled during wintering cultivation, nursery, early maturing, and late growth of Chinese cabbage. The light leaves turn white in thin paper, and the heavy leaves seem to burn and the stalls fall. Ground. Second, the cause: Seedlings of Chinese cabbage and other common Chinese cabbages encounter zero to 5°C in the seedling stage, and the leaves suffer freezing injury. The buds have weak cold resistance, and they are vulnerable to subzero temperatures. Chinese cabbage has strong cold resistance. The temperature dropped below -5°C for a short time and began to suffer freezing. The duration was shorter and the damage was lighter, which did not result in significant freezing damage. However, if it continued for more than two days, the daily average temperature dropped to below zero, causing serious freezing damage. Third, prevention and control methods: 1. Nitrogen-enhanced potassium-enhanced potassium, promote root development and enhance cold resistance. 2, cover protection, the straw, leaves, plants, ash, etc. Shop in the rows of vegetables or cover soil 3? 5 cm to cover the heart leaves, remove the spring. 3, re-applied wax fertilizer, winter before the pig cow manure or soil miscellaneous fertilizer 1,000 ~ 2500 kg applied to the green line, the soil temperature increased by 2 ~ 3 °C, while the winter can be applied to the role of spring. 4, cultivating soil, loose soil, increase the temperature.
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