Author(s): Hiroyuki Ii; Tatemasa Hirata; Hiroshi Matsuo; Tsugio Nakajima; Masataka Nishikawa
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Keywords: Nitrogen contamination; Fertilizer; Tea plantation; Oligotrophy; Eutrophy
Abstract: Two kinds of ponds originated from tea plantation catchments. One was an eutrophic pond which contained abundant photosynthetic plankton because of an ample supply of nitrate and phosphorus from a tea plantation catchment in Fukuoka prefecture. The another pond was an oligotrophic pond which had few photosynthetic plankton because no phosphorus was supplied from its nearest tea plantation catchment in Shizuoka prefecture. In both tea plantations, sufficient nitrogen and phosphorus fertilizer were added into soil. Therefore, in the case of the Shizuoka tea plantation, phosphorus was thought to have combined with aluminum and fixed in the soil.
Year: 1999