薏苡的乾物質生產過程

The Process of Dry Matter Production on Job's Tears

周明和(Ming-Ho Chou)

《花蓮區農業改良場研究彙報》 4期 (1988/04) Pp. 7-8

摘要

花蓮地區春秋作氣候因子迴異，致薏苡生長潛能表現各異，本試驗之目的即為探討春秋作產量差異之原因及乾物質生產過程變化，以作為改進生產之依據，於民國75年秋作至76年春作利用台中選育1號、岡山種與中里種等三品種在本場試驗田舉行。試驗結果指出薏苡單株乾物質累積能力春作高於秋作，較具高產潛能之品種單株乾物重亦最大。LAI與CGR在兩期作均呈極顯著之正相關；NAR與LAI在兩期作則呈極顯著之負相關。春作產量高於秋作主因在供源方面具有較高之LAI與CGR值，積儲方面具有較大之積儲容積（SinkSize）與積儲活性（GGR值高）。品種間具較高產潛能之品種主因係具有較大之供源、積儲強度。薏苡產量之高低係受LAI、CGR、NAR、GGR與HI等生長介量之控制。

並列摘要

In order to find the processes of dry matter productivity on Job's tears, growth analysis was performed at experimental farm of Hualien District Agricultural Improvement Station in the fall crop of 1986 and the apring crop of 1987. The results showed that the dry matter productivity in spring crop was higher than that in fall crop, and high yielding variety gave higher dry matter accumulation. Also, LAI in spring crop maintained greater value over longer period during the grain effective filling stage. In both crop seasons, LAI showed significant positive correlation with CGR but negative correlation with NAR, suggesting that LAI played a more important role than NAR in determinating the biomass productivity of Job's tears. The results also showed that the difference of grain yield between two crop seasons was strongly associated with assimilate supply and demand, ie, controlled largely by growth parameters, such as LAI, CGR, NAR, GGR, HI etc. To understand the source-sink relations and partitions of assimilate, further studies would beneeded.