Effects of nitrogen topdressing time on growth, yield, grain appearance and eating quality of the rice varieties bred by Tohoku Agricultural Research Center
2017
Fukushima, A. (NARO Tohoku Agricultural Research Center, Daisen, Akita (Japan)) | Ohta, H. | Yokogami, N. | Tsuda, N.
The effects of nitrogen topdressing time were investigated in three rice varieties for ready-made meals and restaurants, 'Chihominori', 'Moeminori' and 'Eminoaki', which were bred by NARO Tohoku Agricultural Research Center (TARC). Early heading group 'Massigura', 'Chihominori' and 'Akitakomachi' and medium heading group 'Hitomebore', 'Moeminori' and 'Eminoaki' were also examined. The effects of early topdressing, late topdressing and no topdressing in the three varieties bred by TARC were not significantly different from those in the other varieties. Early topdressing increased the numbers of panicles and spikelets per area, resulting in a higher brown rice yield. Late topdressing slightly increased the number of spikelets per area and thousand grain weight, resulting in a larger brown rice yield. However, early topdressing increased milk white rice, resulting in an inferior grain appearance. Late topdressing increased the nitrogen content of brown rice, resulting in a slightly inferior eating quality. Judging from the yield, grain appearance and eating quality, usual time of nitrogen topdressing was estimated to be appropriate for the three rice varieties made by TARC. Brown rice yield of 'Chihominori' was the same as that of 'Akitakomachi'. That of 'Moeminori' was slightly larger and that of 'Eminoaki' was slightly smaller than that of 'Hitomebore'. The three varieties bred by TARC have high lodging resistance and are expected to show a high yield under high nitrogen fertilization and / or direct seeding cultivation where 'Akitakomachi' and 'Hitomebore' become lodged.
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