Abstract
Relationship between the efficiency of solar energy utilization and growth parameters in seven sugarcane varieties were studied at the experimental field of Okinawa Agricultural Experiment Station.
Changes with time of efficiencies of solar energy utilization were drawn as a parabolic-like curve with the maximum value in June and July.
Significant varietal difference in Eu was found only in early and middle periods. It was considered that different values of Eu related more to magnitude of net assimilation rate than to size of leaf area index.
Eu of RK65-37 and RK65-368 was higher than Eu of NCo310 in early and middle periods of growth, but Eu of NCo310 was higher than Eu of other varieties in late period of growth. In selection of varieties with higher Eu exceeding NCo310, in addition to keeping higher LAI, more stress should be placed on selection of varieties with higher NAR.
