在辽西地区国光苹果大树园,完善腐烂病树病情分级标准,适当增加样本数,将生长期叶分析改为春季发芽前树皮分析。研究发现,树皮中含钾量与腐烂病发生程度之间呈极显著负相关;经初步验证,结果一致。矫治试验结果表明,春季增施钾肥,可提高树皮含钾量并减轻腐烂病发生程度。 In the apple tree garden of Guoguang in western Liaoning, the grading criteria of the disease of rotten diseased tree was perfected, and the number of samples was appropriately increased. The analysis of leaf in growth period was changed to the analysis of bark before spring germination. The results showed that there was a significant negative correlation between the content of potassium in bark and the occurrence of rot disease. The results were consistent after preliminary verification. Correction test results show that increased potassium fertilizer in spring can increase the potassium content of the bark and reduce the extent of rot disease.