Effects of Phosphate and Potassium Concentrations on the Growth and Chemical Components of the Tea Plan by Sand Culture Method

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The comparison of the growth and chemical components of the tea plant which was cultured with nutrient solutions containing various concentrations of phosphate or potassium was investigated from 1961 to 1963 by sand culture method. The results obtained were summarized as follows. 1. The growth of the tea plant was increased with increasing the concentration of phosphate or potassium. But there was general tendency that the increasing rate of the growth in the 50p.p.m. plot was higher than that in the 100 p.p.m. plot, respectively. 2. Phosphate content in the tea plant increased according to the supply of phosphate, and potassium content increased according to the supply of potassium. Total nitrogen, CaO and MgO content increased according to the supply of phosphate. Furthermore total nitrogen and MgO content were increased according to the supply of potassium. 3. Tannin content of the tea leaves was decreased with supply of phosphate or potassium, but it was considered to be caused by the different maturity of the leaves. 4. Sugar and starch contents of the leaves increased with supply of phosphate. Reducing sugar content of the leaves increased, but sucrose content decreased in the without potassium plot. Reducing sugar and sucrose contents of the old leaves increased according to the supply of potassium. 5. Inorganic-P content of the leaves was highest, phytin-P content was lowest than each phosphate fraction, and it was not different between nuclein-P and phosphatid-P content. Inorganic-P content decreased in the without phosphate plot. 6. The absorption of phosphate or potassium by the tea plant was high in July, August, and September, respectively.
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Effects of Phosphate and Potassium Concentrations on the Growth and Chemical Components of the Tea Plan by Sand Culture Method

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