Abstract
The manurial effect of magnesium and the interrelation among nitrogen, phosphorus, potassium, calcium and magnesium absorption on the tea plant were investigated by pot culture tests with yellow soil according to the same method of the previous work (part 1). Furthermore, magnesium of the tea leaves was divided into the following fractions, soluble in 70% alcohol, distilled water, 2% acetic acid, 5% hydrochloric acid, and insoluble. The results obtained were summarized as follows.
1. It was observed that magnesium was very effective in the growth of the tea plant and most effective with a double dressing of phosphate than the other plots.
2. Total-N content of the young leaves was increased and potassium content was decreased by supplying magnesium, while magnesium content was decreased with a double dressing of potassium.
3. In general, each magnesium fraction was increased by supplying magnesium, especially the water soluble and acetic acid soluble fraction were most increased, and the alcohol soluble fraction of old leaves was increased in the no potassium plot.
4. The soil supplied with magnesium had a higher pH value and a lower exchangeable acidity than that not supplied with magnesium.
