トウモロコシの物質生産に関する研究 : 第3報 個体群光合成構成因子の生育に伴う変化とその相互作用

抄録

Five varieties of corn seeds (Golden Cross Bantam, Kohshu Tomorokoshi, Koh No.3, White Dent Corn and Chokoh No.161) were sown under three different levels of spacing (30cm × 30cm, 45cm × 45cm, 60cm × 60cm) to know the changes and interaction of plant factors constituting canopy photosynthesis. Results obtained are as follows. 1. Within the limit of this experiment, leaf amount regulated the dry matter production of corn. Therefore, high correlation between LAI and CGR was observed at any growth stages. 2. However, if limited the range of LAI in addition to devide growth stage into three (early vegetative stage, active vegetative stage and ripening stage), contribution rate of other plant factors against CGR became clear. That is, during the stages having only poor amount of leaf area, the larger the value of light extinction coefficient K', the higher the CGR obtained. But after leaf amount was plentifully attained, vice versa. 3. Deviding the growth stage and LAI in the same way as 2, positive correlation between NAR and CGR were observed at any growth stages