1. Citrus: Gently knock or shake off the ice and snow that has accumulated on the tree using your hands or bamboo poles. Afterward, clear the snow around the base of the tree and loosen the soil within a 20-30 cm radius of the roots to prevent the entire tree from freezing. For nurseries or young saplings, you can place straw or hay on top of the snow and cover it with plastic film for additional protection.
It's the season for spring fertilization, which plays a key role in promoting new growth and laying the foundation for flowering, fruiting, and high yields throughout the year. However, due to the heavy snow and ice this year, the roots and leaves have been damaged to varying degrees, making it difficult for them to absorb nutrients effectively. Therefore, different fertilization methods should be used depending on the extent of frost damage. For trees with more severe damage, foliar sprays are recommended. On sunny days between 10 am and 4 pm, spray a 0.2%-0.4% urea solution once daily, along with a 0.1%-0.2% potassium dihydrogen phosphate solution, for 3-5 consecutive days. This not only helps replenish essential nutrients quickly but also provides moisture to the trees, preventing them from suddenly losing water due to frost damage or sudden weather changes, which could lead to wilting.
Because the trees are already damaged, the concentration of the foliar fertilizer should be lower than usual. Urea concentration should generally not exceed 0.5%, and potassium dihydrogen phosphate should not go beyond 0.3%. For trees with lighter frost damage, especially those that didn't receive adequate fall fertilization, applying a base fertilizer is recommended. It is advised to use 30–40 kg of well-composted organic fertilizer per citrus tree or 1–1.5 kg of high-nitrogen and phosphorus compound fertilizer.
Citrus fertilization should also focus on three key points:
1. In low-temperature and wet conditions, pests and diseases are more likely to occur, so fertilization should be combined with pest control measures.
2. Fertilization should be paired with proper thinning of fruits to ensure better resource allocation.
3. Improve soil temperature and root aeration by cultivating loose soil and ensuring good drainage.
2. Greenhouse Vegetables: Eggplants are the most severely affected by frost. If they suffer serious cold damage, consider replacing them with vegetables like melons, cabbages, spinach, chrysanthemum, bok choy, radishes, and other short-cycle crops that can be transplanted quickly.
For greenhouses, no basal fertilizer may be needed, but for open-field vegetables, it is recommended to apply 1,000–3,000 kg of fully matured organic fertilizer and 100% of high-nitrogen compound fertilizer.
3. Wheat Seedlings: In southern China, where rice cultivation is widespread, heavy rain and snow have increased damage and delayed the return of green wheat. The first step is to dig trenches and ditches to ensure proper drainage, connecting vertical trenches, gutters, and Tiantougou systems. These should be linked to main rivers, keeping the groundwater level at least 50 cm below the surface. Once the wheat seedlings recover, combine this with loosening the soil using a cultivator. Apply approximately 5 kg of urea or 10 kg of ammonium sulfate. Be careful not to over-fertilize at once; the best options are ammonium nitrate or nitro compound fertilizers, followed by ammonium sulfate or urea. Due to limited irrigation and soil coverage, it’s better to avoid ammonium bicarbonate. For drought-affected or frost-damaged wheat fields, use a cultivator to break up the soil and raise the temperature, helping the plants recover more effectively.
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