砂耕試験による温州ミカンの異常落葉に関する研究

IR Web Site

Bibliographic Information

Other Title
  • 砂耕試験による温州ミカンの異常落葉に関する研究(農学部門)
  • サコウシケン ニ ヨル ウンシュウ ミカン ノ イジョウ オチバ ニ カンスル ケンキュウ
  • Studies on "Abnormal defoliation" of Satsuma orange trees under sand culture (Agriculture)

Search this article

Description

In order to investigate "Abnormal defoliation" of Satsuma orange trees, the experients were carried out from 1965 to 1967 on manganese absorption of Satsuma orange trees under sand culture. The results were as follows : 1) The plant growth decreased with high level of N concentration. Particularly, this tendency was recognized remarkably in the fibrous roots growth. With increasing Mn concentration, the growth decreased, whereas this tendency was depressed with high level of Ca. 2) The Mn content in the leaves increased with high level of Mn and greatly increased with decreasing level of N. This trend, however, was not noticed under Ca concentration. 3) The P content in the leaves was not affected by N or Mn concentration. The content of Ca and Mg was more affected by N concentration than Mn. The content of K and Ca reduced with high level of Mn concentration, but in this case only Mg content increased. 4) Under the various kinds of root stock and PH of solution, the Mn content in the leaves was not changed. 5) It was recognized that the fibrous roots in all parts of the trees involved the relative abundance of Mn and Mn content decreased in the order : leaves, shoots, middle roots and trunks. 6) The content of Ni, Zn and Cu in the leaves was not changed by Mn content. 7) With increasing Mn concentration, respiratory activity in the roots reduced. In this case, the content of protain-N in the leaves reduced, but Amino-N and Amide-N increased. It has been suggested that "Abnormal defoliation" of Satsuma orange trees is caused by excessive Mn absorption. From the above observations, however, "Abnormal defoliation" was not always caused by the simple factor. It is, therefore, presumed that various factors as declining of tree vigor will affect during a long period on "Abnormal defoliation" of Satsuma orange trees.

Journal

Details 詳細情報について

Report a problem

Back to top