It was revealed in an extensive survey that the occurrence of apple Valsa canker (Valsa ceratosperma) is correlated negatively with potassium content in bark.
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。
It was revealed in an extensive survey that the occurrence of apple Valsa canker (Valsa ceratosperma) is correlated negatively with potassium content in bark.
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。
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