A seed production system in highlands area of rice [Oryza sativa] varieties with different time of maturity

To make a effective seed production system of many rice varieties with different maturity in highlands area, the time of transplanting, the time of maturity, yield, quality and the rate of germination have been examined. The late variety 'YUMEHIKARI' showed stable yield and matured high quality when it transplanted on the period from the beginning to late in May. Furthermore, on the varieties 'KOSHIHIKARI' (extremely early variety) 'HINOHIKARI' (medium variety) and 'YUMEHIKARI' (late variety), the transplanting on early in May gave good yields and quality. And the transplanting days of 'KIRARIMIYAZAKI' (extremely early variety) was late in May. The multi-variety seed production at the same area in highlands can be possible.