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No.34 (1987/12) >

 
Title :春植えサトウキビの耕作年次にともなう生育特性の推移(附属農場)
Title alternative :Changes in the growth characteristics in spring planted sugar cane during the first crop and ratoon crops culture (Agricultural Experiment Station)
Authors :仲間, 操
野瀬, 昭博
宮里, 清松
村山, 盛一
Authors alternative :Nakama, Misao
Nose, Akihiro
Miyazato, Kiyomatsu
Murayama, Seiichi
Issue Date :5-Dec-1987
Abstract :基盤整備直後の泥灰岩土壌畑(琉球大学農学部附属農場4番圃場)において, サトウキビ(品種NCo310)を春植えし, その後一次, 二次株出し栽培下における生育の様相を追跡調査した。得られた結果の概要は以下の通りである。1) 各栽培年の最終収量は, 新植から株出しと耕作年次の進展にともない低下した。単位土地面積当りの総乾物量は, 調査期間を通して漸増し, その程度は新植で最も大きかった(図1)。2) 12月の生育量を基準にして, それ以前の生育量を相対値で表すと, 新値と株出し栽培で生育経過に明らかな違いが認められた(図4,図5)。特に, 株出し栽培では新植にくらべ初期生育が優れていることが認められた。3) 個体群生長速度(CGR)は, 新植の9∿10月に42g/m^2/dayと極めて高い値を示し, 株出し下では最大CGRが15∿17と低かった(図2)。4) 調査期間を通しての生長関数の相互の関係は, CGRがNARと密接に関係し, LAIとは余り関係しないことを示していた(表2)。5) 本研究で調査したサトウキビにおいて, 茎への乾物の分配率が調査期間を通して高く, 生育の後期にも茎への乾物の蓄積が行われていることが明らかになった(図9)。6) 葉面積を未抽出葉の展開部も含めて評価すると, LAIでは最大23%, 葉乾物重では18%, 増大することが明らかになった(図10)。
Using experiments in marl soil field right after the land consolidation (Field No. 4,Experimantral Farm, University of the Ryukyus), changes in growth characeristics of the first crop. first ratoon crop, and second ratoon crop of spring planted sugar cane, Saccharum officinarum L. var. NCo 310,were examined. Outlines of the result obtained were as follows : The final cane yield of earch crop decreased in the order of first crop, first ratoon crop, and second ratoon crop, that is, 5.5,4.6,and 3.5 tons per 10a, respectively. For each crop, the total dry matter including dead part per unit land erea graduarally increaed through all the experimental period, and the increaseing rate was greatest for the first crop (Fig. 1 and Fig. 7). When compared to the growth in respective December, the relative growth in the month preceeding to each December showed a clear difference in the growth process between the first crop and ratoon crops (Fig. 4 and Fig. 5). Growth in the early growth stage was larger in ratoon crops than in the first crop. The highest crop growth rate (CGR) of 42.3g/m^2/day, was observed between September and October in the first crop (Fig. 7). Max. CGR in the ratoonings was low, showing 17.9 and 15.8g/m^2/day for the first and second ratooning, respectively. The interrelation of growth parameters throughout the present experimental period showed a significant relation between CGR and NAR, but the relation between CGR and LAI was not significant (Table 2). The dry matter distribution ratio in the stalk for the cane in the present study was high throughout the experimental period, and it was clearly found that the accumulation of dry matter in the stalk was preferentially done even in the last stage of growth (Fig. 9). When leaf area was evaluated by including the expanded parts of not fully expanded leaves on the top of stalk, it was shown that LAI and dry weight of the leaf increased by 23 and 18 percent, respectively (Fig. 10).
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3916
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.34 p.187 -198
Appears in Collections:No.34 (1987/12)

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