イチジク樹の肥料要素吸収量に関する研究

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1. With two 6-year-old fig trees (MASUI DAU-PHINE) planted in the orchard of the Horticultural High School of Osaka Prefecture, the yearly amounts of the five nutrients absorbed were estimated, by separating all parts of _??_ tree (trunk, branches, and roots) into new and old tissues, and analyzing them for nitrogen, phosphorus, potassium, calcium, and magnesium. 2. The results showed that the dry weights of a whole tree and its new tissues were 8.03kg and 6.08kg respectively, The latter was 75.7% of the former. The weights of new tissues of various parts of a tree were as follows: fruits, 3.31kg; leaf, 1.00kg; one year old branches, 0.40kg; tops (not including leaves, fruits, and one year old branches), 0.8kg; fine roots, 0.07kg; roots (not including fine roots), 0.49kg; total, 6.08kg. 3. In comparing each new tissue as to the content of each of the five nutrients, the highest value of N was found in the leaves and immatured fruits; that of P2O5 in roots of medium and large size; that of K2O in fruits, medium and small roots, and that of CaO and MgO in leaves. In addition, new bark tissues always indicated a higher value of all ele-ments than the new wood tissues. 4. The total amounts of each five nutrients con-tained in new tissues of a tree were: N 70.0g, P2O5 20.3g, K2O 79.6g, CaO 104.5g, and MgO 22.6g. On the basis of this data, the yearly amounts of the nutrients absorbed by 100 trees which were planted in a field of 10 ares, with a production of 2696.35kg, came to N 7.00kg (index number 10.0), P2O5 2.03kg (2.9), K2O 7.96kg (11.3), CaO 10.45kg (14.9), and MgO 2.26kg (3.2).
園芸学会の論文

イチジク樹の肥料要素吸収量に関する研究

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