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No.32 (1985/12) >

 
Title :ジャイアント タイプ ギンネムの生産生に及ぼす施肥の効果 : 2 年目の成績(農学部附属農場)
Title alternative :The effects of fertilization on the Productivity of giant-type Leucaena leucocefhala : The second year results (Agricultural Experiment Station)
Authors :古謝, 瑞幸
Authors alternative :Koja, Zuiko
Issue Date :2-Dec-1985
Abstract :ジャイアント タイプ ギンネムの生産性に及ぼす施肥の効果について2年目の調査をした。試験に用いられた品種はハワイから導入されたK72aであった。試験地は琉球大学農学部附属農場の泥灰岩よりなるアルカリ性土壌であった。試験区は3処理×2地区の6区とした。1区の面積は9m^2(3×3)にした。施肥は1区当り化学肥料を500gずつ3回行った。刈取りは地上25cmから年間に6回行った。1)ギンネムの年間9m^2当りの生草収量の平均は89.4kgで, 地区及び処理間には肥料効果が殆んどなく, 有意差が認められなかった。しかし, 刈取り回数間には有意差が認められた。2)ギンネムの乾物収量については9m^2当り年間平均で21.7kgであった。生草と同様に処理と地区においても肥料効果及び有意差が認められなかった。乾物収量が生草収量に占める割合いは平均して24.2%であった。3)ギンネムの1日当りの平均生産量は生草が291.2g, 乾物が69.5g, 草丈が2.0cmであった。4)ギンネムは2回刈りと3回刈りの夏期において最も生産性が高く, 秋から冬にかけては低調であった。5)以上の結果からギンネムは施肥効果が殆んどなく, 無肥料でも栽培して生産を上げることが示唆された。
The second year investigation on the effects of fertilization for the productivity of giant-type Leucaena (K72a) was carried out from November 9,1983 to December 4,1984 in Okinawa. The soil type consists of marllike semidentsgray clay. Six plots of 9m^2 (3×3) were arranged dividing into three treatments-I : control, II : N-14 P-5 K-8 and III : N-9 P-9 K-18,and two duplications. Five hundreds grams of chemical fertilizer mentioned above was used 3 times per year to each plot. The cutting height of the plants was 25cm above the ground level. 1) The over-all mean of annual green yields of Leucaena (K72a) in 9m^2 was 89.4kg (14.9kg×6), which was 14.4kg higher than that of the first year. There was no fertilizer effects on the treatments and the blocks, and significant differences were not shown on them. The highest yields among the cutting frequency was shown in the 1st cutting, and the lowst in the 5th, and there were high significant differences among them. 2) The over-all mean of dry matter yields in 9m^2 was 21.7kg (3.6kg×6). Fertilizer effects and significant differences on the treatments and the blocks were not shown. However, there were high significant differences among the cutting frequency. The dry matter ratio for the green yields was 24.2% and it was higher specially in the seasons of fall and winter. 3) The over-all mean of daily gain (DG) of the green yields was 291.2g and significant differences were not shown on the treatments and the blocks. However, there were high significant differences among the cutting frequency, and specially the 2nd and the 3rd cutting were higher than the 1st and the 6th. The same results were obtained from the case of the dry matter yields and the stem length.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3954
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.32 p.193 -197
Appears in Collections:No.32 (1985/12)

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