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1993年冬季至1994年春季之间，延边地区苹果梨花芽遭受严重冻害。经试验及调查发现，花芽受冻害致死率与氮磷钾不同配合比例明显相关，磷氮比、钾氮比在0．5以下时，高磷、高钾处理花芽受害程度明显比低磷、低钾处理轻，花芽全死率明显减少，结果数明显增多；而磷氮比、钾氮比超过0．5时，虽然也有相同趋势，但不明显。
Between the winter of 1993 and the spring of 1994, flower buds of apple pear in Yanbian suffered serious frost damage. The experiment and investigation showed that the lethal rate of frost damage caused by flower bud was significantly related to the different proportions of NPK. When the P / N ratio was below 0.5, the damage degree of flower bud treated with high P and K was obviously lower than that of low P, Light treatment of potassium resulted in a significant decrease in the total mortality of flower buds and a significant increase in the number of results. However, the same trend was noticed when the P / N ratio and K / N ratio exceeded 0.5.