葉分析によるカラマツの栄養診断に関する研究

概要

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Using the Japanese larch, the relationship between nutrient elements of leaves and growth is observed for the purpose of appling a leafanalysis to nutritive diagnosis. The results are summarized as follows: (1) It is found in leafanalysis that growth depends on contents of some nutrient elements such as nitrogen, phosphorus, potassium and calcium. Thus the proper contents of these nutrient elements for rapid growth are obtained. (2) It is found that the seedlings and the adult trees have respectively different requirement of nutrient elements: the seedlings require phoshorus and calcium rather than nitrogen and potassium, while the adult trees require nitrogen and potassium rather than phosphorus and calcium. (3) The relationship between nutrient elements contents of leaves and growth of seedlings differs from that of adult trees: in seedlings phosphorus and calcium contents have close relation to growth, on the other hand in tnees nitrogen and potassium have close relation to growth. Thus in seedlings the ratio of N:P, K:P, and N:Ca has close relation to growth, while in trees the ratio of N:K plays an important role. (4) Since the nutrient element contents in leaves varied by tree ages, seasons, parts, site conditions and other factors, the application of leafanalysis to nutritive diagnosis should not be carried out without taking account of the case.
信州大学農学部の論文