Cultivation method for high quality and stable yield in the malting barley cultivar 'Asuka Golden'
2015
Yamaguchi, M. | Toyoshima, T. | Oyama, M. | Oozeki, M. | Sekiwa, T. | Suzuki, Y. | Usui, M. | Kato, T. | Sotome, T.
In 2012, in the Tochigi prefecture, a new malting barley cultivar 'Asuka Golden' was adopted as the recommended cultivar. Since then, its cultivation has been expanding. To promote 'Asuka Golden' production, we investigated the effects of fertilizer and seed amounts, and seeding date on its growth, yield components, and malting qualities. Unlike the cultivar 'Sachiho Golden', the plump-grain weight of 'Asuka Golden' did not significantly vary when we applied a standard or increased level of fertilization. This was because in the 'Asuka Golden' cultivar the proportion of plump-grain decreased as the amount of fertilizer increased. The malt extract content showed a more or less adequate value at the standard level of fertilization. At a low seed-amount level, the number of ears in 'Asuka Golden' was greater than that in 'Sachiho Golden', while the plump-grain weight was similar in both cultivars. However, at a high seed-amount level, the plump-grain weight decreased more in 'Asuka Golden' than in 'Sachiho Golden'. Regarding the seeding date, an early seeding date (late October) decreased the thousand grain weight while a late seeding date (late November) delayed maturation and increased the crude protein content. Based on our results, we concluded that the optimum amount of basal nitrogen fertilizer was 0.55-0.65 kg/a and optimum seed amount was 0.65-0.70 kg/a, which is lower than normal levels. In the southern part of this prefecture, the proper seeding date was the third to fourth pentad of November.
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