Dry matter trait and feed composition of rice varieties for WCS in the Tohoku region of Japan
2017
Fukushima, A. (NARO Tohoku Agricultural Research Center, Daisen, Akita (Japan)) | Ohta, H. | Yokogami, N. | Tsuda, N.
This study was conducted to elucidate the effect of harvest time and varietal differences on dry matter traits and feed composition of rice for whole crop silage (WCS). Total dry weight was closely related with the growth period; it increased with the delay of harvest time and was heavier in late heading varieties than in early heading varieties. The water content of plants decreased gradually after heading similarly in both early and late heading varieties. Total digestible nutrients (TDN) estimated by using near infrared rays increased from 20 days after heading to 40 days after heading, as the weight of panicles that contained a large amount of non-fibrous carbohydrate (NFC) increased. However, the real TDN did not increase since the ratio of unhulled rice that is hard to digest also increased during ripening. Among the early heading varieties that could be harvested before the harvest of food rice, 'Bekogenki' was expected to be useful since it had a slightly larger total dry weight, slightly lower panicle weight ratio and slightly higher NFC of leaf and stem. Among the late heading varieties that could be harvested after harvesting of food rice, 'Tachiayaka' was expected to be useful since it had a larger total dry weight, extremely lower panicle weight ratio, and higher NFC and sugar content of leaf and stem.
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