Abstract
In Tomo Area of Gunma prefecture, paddy rice cultivar Goropikari had been widely cultivated from 1993. This cultivar has good taste, but farmers pointed out its weak resistance to diseases and insects, low yielding ability and poor grain quality after release. Therefore, in the 2000 s, we recommended replacing it with a new cultivar Asahi-no-yume in Tomo area. Asahi-no-yume is superior to Goropikari in resistance to diseases and insects and yielding ability, but the maturation is late. Hence, the time limit of transplanting was supposed to be 15 June, but later transplanting, e.g., on 25 June after wheat crop was desired. Therefore, we examined whether Asahi-no-yume is adaptable to transplanting after 15 June in Tomo area for 3 years from 2000 to 2002. The results showed that transplanting on 25 June had the same yield and grain quality as transplanting on 15 June, and we judged it possible to cultivate rice after wheat cropping in this area.
