Yielding ability of rice varieties and lines for feed in the Tohoku region of Japan
2018
Fukushima, A. (Agri-Food Business Innovation Center, NARO, Tsukuba, Ibaraki (Japan)) | Ohta, H. | Yokogami, N. | Tsuda, N.
Yielding abilities of elite high yield varieties 'Fukuhibiki' and 'Bekoaoba', a new high yield variety 'Iwaidawara', and a new high yield line 'Ouu418' were examined, using the data of the performance test for breeding. These varieties, which were for feed, showed higher yield, compared with the varieties for staple food under the condition of standard nitrogen application. The varietal difference in yield was enlarged by high nitrogen application (HN). The yield did not significantly vary with variety or line by HN. By contrast, 'Bekoaoba' and 'Ouu418', which had a short culm and strong lodging resistance, had slightly higher yield by extremely HN. However, the increase in yield was only 2%, suggesting that it was difficul to increase the yield by extremely HN. Yielding abilities of 10 varieties and lines including other new lines for feed and 6 varieties for staple food were compared. All 10 varieties and lines had the smaller number of panicles per area and the larger sink size per panicle (=the number of spikelet per panicle * single grain weight). However, we found no lines showing significantly higher yield, compared with the high yield varieties 'Fukuhibiki' and 'Bekoaoba'. We concluded that breeding for extremely high yield was difficult and that breeding for varieties with a stable high yield and that allow large scale - low cost cultivation was more important.
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