福岡県農業総合試験場24（2005）　pp 113−116

　

イグサのポット苗機械移植栽培に適した苗箱への挿し苗の大きさと育苗期間及び本田への移植適期

　

井上拓治・福島裕助・住吉強

（筑後分場）

　

　イグサ栽培におけるポット苗機械移植栽培（以下，ポット栽培）に適した苗箱への挿し苗の大きさと育苗期間及び本田への移植適期を明らかにした。苗箱への挿し苗の大きさは2茎2芽及び2茎1芽では，育苗箱内での枯死株率や移植時の欠株率が低かったが，3茎2芽と3茎1芽では枯死株率及び欠株率が高くなった。ポット苗では手植え苗に比べると総茎数は1/2以下と少なく，新芽も少なかったが、育苗期間を60日とすると50日より3cm以下の新芽が多く，本田移植後の初期生育の遅れは少なかった。ポット栽培は手植えに比べ，本田移植後の1株茎数は少なく，3月下旬までの初期生育は遅れたが，収穫時の茎数は多かった。本田への移植時期は11月上〜中旬に本田移植すると春先までの生育の遅れが少なく，手植え苗と比べて収量は同等からやや多く，イグサ原草の主要な形質等の品質は同等であった。

　以上のことから，ポット栽培に適した苗箱への挿し苗の大きさは2茎2芽及び2茎1芽，育苗期間は60日が適し，本田への移植適期は11月上〜中旬と判断された。

［キーワード：イグサ，ポット苗，機械移植，挿し苗，移植適期］

　

　The Size of Mat Rush Seedlings to be Loaded on Seedling Boxes of Pot Transplanting Machine and the Period for Raising Seedlings and Optimal Transplant Time to Paddies.　INOUE Takuji，Yusuke FUKUSHIMA and Tsuyoshi SUMIYOSHI (Fukuoka Agricultural Reseach Center, Chikushino, Fukuoka 818-8549, Japan) Bull.Fukuoka Agric.Res.Cent 24:113−116(2005)

　The size of mat rush seedlings to be put in seedling box of a transplanting machine, raising of seedling periods and optimal transplant time to suitable rice paddies were clarified. As to the sizse of the seedling stoke , those with 2stems-2buds and 2stems-1bud showed similler rotes of plant death and missing plants; those with 3stems-2buds and 3stems-1bud had higher rotes. The number of stems of the pot seedlings was about a half compared to seedlings manually transplanted and the number of tillers was also small. However, small new tillers of 3cm or less abounded from the 50days of transplanting and the growth was not hindered in the early stage, when raising of seedling periods were presumed to be 60days. In the pot culture stocks, compared to manually transplanted stocks, the number of stems per stock was fewer. The growth by the end of March was delayed, however, the number of stems in the harvesting were aboudand. Ｔhere was little dalay in the growth of the machine transplanted seedlings by the early spring when they were transplanted to a paddy field from early to mid-November. Also, the yield was a little larger on equal compared to manually transplanted stocks. The main characteristies of the mat rush of the former was equal with root of the latter.

[Key words：mat rush，pot seedling，machine transplantation，press seedling，transplantation optimal timing]