Affected by the strong cold air in the north, many of the mandarin oranges grown in Guangdong, Guangxi, Fujian and other places have been damaged by freezing. If the pre-flowering fertilizer can be applied in time, the tree potential can be restored, the development of young fruit can be promoted, and the deformed fruit can be reduced. . The specific fertilization methods are as follows:
The frozen honey pomelo must be applied before the application of small cold and cold, with high-quality organic fertilizer and complete NPK fertilizer, and phosphorus and potassium fertilizer and biological fertilizer. The result tree of five years or more, 15~20 kg of manure and poultry manure per plant, 0.75~1 kg of potassium sulphate (15:15:15) potassium sulphate compound fertilizer, superphosphate or calcium magnesium phosphate fertilizer ~1.5 kg, potassium sulfate 0.25~0.5 kg, compound biological fertilizer 0.5~0.75 kg.
After thoroughly mixing and mixing all the fertilizers, wrap the water around the canopy, dug the annular groove with a depth of 25 to 30 cm, spread the evenly mixed fertilizer in the annular groove, cover the soil, and cover the fertilizer. Live, and then apply 40~50 kg of clear water or biogas slurry to each tree or simmer the decomposed manure and manure water, so that the water completely penetrates into the soil and does not flow out.
In addition, it is necessary to carry out the root dressing in time. Sprayed 0.1% borax, 0.1% magnesium sulfate, 0.1% zinc sulfate, 0.2% urea, 0.3% potassium dihydrogen phosphate, 600 times Amino Acid compound micro-fertilizer, 1000 times triacontanol, 1500 times every 7-10 days. 0.001% natural brassin mixture can be sprayed continuously for 2~3 times.
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