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叶片内的化学成份,有助于阐明树的根系在土壤里吸收什么营养元素。从生长最好的果园里适当采取的叶样,不论果园在何处,其主要营养成份的浓度相似。
The chemical composition of the leaves helps to clarify what nutrients the tree’s roots absorb in the soil. Properly taken leaf samples from the best growing orchards where their orchards are located have similar concentrations of their main nutrients.