Studies on the Relation between Abnormal Tea Leaf and Contents of Inorganic Elements (Part 2)

Occurrence of Abnormal Tea Leaf with Increasing Supply of Nickel or Manganese

Abstract

The tea plants were planted in pots filled with the field soil of the Shizuoka Tea Experiment Station and were supplied with excessive amounts of nickel and manganese to detect the toxic symptoms due to these elements.
1. The tea plant developed striped chlorotic leaves when supplied with 5 ppm. of Ni, and died with 50 ppm. of Ni.
A diffused chlorosis was observed on the leaves when supplied with 1 g. of MnO per pot.
2. There was a tendency that the striped chlorosis due to excessive nickel was detected in summer and the diffused chlorosis due to excessive manganese was detected in the fall. In winter, the striped chlorotic leaves produced brown spots, and sometimes the brown part of leaves died.
3. Zinc content was poor in the striped chlorotic leaves.
4. The soil which produced the striped chlorotic leaves contained richer exchangeable Ni, and that produced the diffused chlorotic leaves contained richer exchangeable Mn and water-soluble Mn.