Studies of improvement in utilization of sorghum silages, 6: Effects of cultivar, growth stage and seeding time of hybrid sorghums on fermentation quality of silage.
1990
Miaki T. | Tanaka S. | Kawamura O. | Shinkai K.
A sorghum-sudangrass hybrid cultivar (SSIV: sweet sorgo) and four sorghum hybrid cultivars (FS401R: Hybrid sorgo, FS902: Big sugar sorgo, FS304: Hi-sugar sorgo and P956 : Hi-calo sorgo)sown on 8 may were harvested at six growth stages: vegetative, booting, booting-early heading, flowering, milk ripe and dough ripe for silage making, and their aftermath silages were prepared on 25 September. Also three sorghum hybrid cultivars (FS401R, FS902 and FS304) sown on 5 August were harvested on either 1 October or 13 October for silage making. When the plant materials used contained TNC content above 15%, all silages were excellent in fermentation quality. Sorghums having TNC of lower than 10% however, were poor in fermentation quality. In a range of 10-15% TNC content there were large differences in fermentation quality among the five sorghum cultivars. The fermentation quality of silages prepared in the vegetative and booting stages was greatly influenced by cultivar and seeding time. Sorghum silages sown in August and harvested in October were better in fermentation quality in the vegetative and booting stages than those sown in May and harvested in July or August.
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