Cultivation characteristic of new rice variety “Yumeobako”

To clarify a cultivation method of “Yumeobako”, we examined its growth characteristics, fertilizing method and harvesting time from 2004 to 2009. The results are summarized as follows; 1. In same basal nitrogen application (0.5kg/a), “Yumeobako” can yield more than “Akitakomachi” about 6kg/a. But, high basal nitrogen application (0.7kg/a) resulted in higher brown rice yield in “Akitakomachi”, but not in “Yumeobako”. No significant relationship was observed between the number of panicle per square m and the number of spikelets per square m, and the number of panicles per square m showed a significant negative correlation with the number of spikelets per panicle in “Yumeobako”. 2. The top dressing of nitrogen applied at the meiotic stage resulted in bigger 1,000 grain weight and higher percentage of ripened grain, compared with top dressing at other stages or no top dressing. 3. Target of yield was reasonable between 63 and 66kg/a, in this case; number of panicles per square m was about 400～430, number of spikelets per panicle was 76, number of spikelets per square m was 30,400～33,000, percentage of ripened grains was 84, 1,000 grain weight was 24.5g. And we suggested the ideal growth index (plant height, number of tillers and leaf color) at several growth periods. 4. Rice harvested before 1,050℃ (temperature accumulated after heading) had a high green rice kernel ratio, and after 1,150℃ had a high ratio of heavily and slightly craked rice. We are of the opinion that harvest temperature of 1,050～1,150℃ would provide the good visual grain quality. 5. Tiller production of “Yumeobako” was more than of “Akitakomachi”, but the percentage of bearing tillers of “Yumeobako” was lower than of “Akitakomachi”. The weight of brown rice per panicle of “Yumeobako” was heavier than of “Akitakomachi”, because of bigger 1,000 grain weight of all bearing tillers.