Abstract
Wild rice (Zizania palustris L.) can be used as a crop for a paddy field in fallow. Plant length of wild rice was longer than that of paddy rice. Panicle number of wild rice was large, which promises a high yield. In upland conditions, the amount of water and nutrients absorbed was insufficient and the wild rice died. The crop growth rate (CGR) was limited by leaf area index in the first half of the growth period and NAR tended to contribute to CGR in the latter half of the growth period. The maximum efficiency of solar energy utilization was 2.1%. The average yield of wild rice was 141kg/10a. Early maturing short-culmed populations of wild rice were selected by mass selection. Lysigenous aerenchyma was observed in roots, stems and leaves. Other traits of wild rice were generally in common to those of paddy rice. Pollen shedding reached its peak in the morning, but on cloudy days, its peak was later than on sunny days. The percentage of self-fertilization was 4.7%.
