Relation between the Absorption of Applied Phosphorus by Tea Plant and Available Phosphorus Content of Soil

The relation between absorption of applied phosphorus by tea plant and available phosphorus content (Truog's method) of tea soil was investigated by pot, field and laboratory experiments with radio active phosphorus (32P). When the available phosphorus content ex-ceeded 30-40mg. (P2O5)/100g. in red yellowish soil and 20mg./100g. in "kuroboku" soil and 10 mg./100 g. in volcanic ash soil, the ratio of applied phosphorus content to total phosphorus content of the tea leaves and young stalks decreased less than 5 %. So, it will be suggested that these content level of available phosphorus relates closely to the fertility of these soils. When the radioactive phosphorus was applied to the low available phosphorus plot, more amount of applied phosphorus was absorbed in inorganic-P and phosphatid-P fractions in new and mature tea leaves, but the phosphatid-P content of those parts of tea plant was lower than that of the high available phosphorus plot.