福岡県農業総合試験場研究報告14（1995） pp 46 - 49
イグサ品種‘いそなみ’における生育診断に基づく追肥の施用法
大隈充子・松井 洋・森藤信治・住吉 強
イグサ品種‘いそなみ’の普通刈栽培における高品質安定多収生産のための生育診断法及び生育診断に基づく適正な追肥の施用法を明らかにした。@長茎（１０５ｃｍ以上の茎）の収量１，０００ｋｇ／１０ａ以上を確保するために必要な生育診断時の窒素吸収量は，４月中旬で４ｋｇ／１０ａ，５月上旬で８ｋｇ／１０ａである。A茎長，茎数（１５ｃｍ以上の茎，本／株）及び茎色値の積は茎中窒素吸収量と相関があるので，生育診断の指標値は茎長，茎数及び茎色値の積により求められる。B５月上旬の生育診断で生育が「不良」と判定された場合，第１回追肥は８ｋｇ／１０ａ（窒素成分）施用するとよい。
［キーワード：イグサ，生育診断，窒素吸収量，追肥］
Application Method of Topdressing Based on a Growing Diagnosis in Mat Rush Cultivar 'ISONAMI'. OKUMA Mitsuko, Hiroshi MATSUI, Nobuharu MORIFUJI and Tsuyoshi SUMIYOSHI (Fukuoka Agric. Res. cent. , chikushino, Fukuoka 818, Japan) Bull. Fukuoka Agic. Res. Cent. 14 : 46-49 (1995)
This study was conducted to clarify a proper growing diagnosis and application method of topdressing based on growing diagnosis of mat rush cultivar 'ISONAMI' in middle harvesting culture. (1) To produce 1,000kg per 10 a or more yield of long stems (105cm or longer) , the amount of nitrogen absorption of stems in the middle of April and in early May were 4kg per 10a and 8kg per 10a, respectively. (2) Criterion value for the growing diagnosis was estimated by (A x B x C) , where A, B and C were plant height, number of 15cm or longer stems per plant and color value of stem, respectively, because it was significantly correlated with the amount of nitrogen absorption of stems. (3) If it was judged that the growth was not enough in early May, it is necessary to apply 8kg per 10a of nitrogen fertilizer for the first topdressing.
[Key words : Mat rush, Growing diagnosis, Nitrogen absorption, Topdressing]
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