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林木正常生长所需要的营养元素是互相促进、互相制约、不可互相代替的.因此,当林地土壤中某种营养元素缺少或不足时,落叶松针叶或新梢生长不正常,出现缺少营养元素的外部症状.这种缺肥外部症状对指导落叶松林地合理施肥具有一定意义。
Therefore, when some nutrient elements in forest soil are lacking or not enough, the needles and shoots of larch trees grow abnormally and there is a lack of nutrients External symptoms. This lack of external symptoms of larch forest to guide the rational fertilization of a certain significance.