Effects of Various Management Practices on Growth and Forage Yield of New-sorgo

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  • ニューソルゴーの灌漑および栽培管理法に関する研究
  • ニューソルゴー ノ カンガイ オヨビ サイバイ カンリホウ ニ カンスル ケンキュウ

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The effects of irrigation, amount of fertilizer, row spacing, plant population, cutting frequency and cutting height on growth and forage yields of New-sorgo (interspecific hybrid between Sorghum vulgare PERS. and S. sudanense (PIPER) STAPF.) were investigated in 1963 and 1964. The results obtained are summarized as follows : 1. Irrigation increased forage yields by the increase of growth rate in fresh weight per unit area. The interaction between irrigation and cutting frequency was significant in 1964, that is, the effects of irrigation increased strikingly when cutting period was short. Short cutting period augmented the effects of irrigation because these cutting procedures mitigated the retard of regrowth after cutting. 2. Heavy fertilization increased forage yields by the increase of plant height, but the interactions between heavy fertilization and other treatments were not significant. Heavy fertilization increased remarkably the forage yields of first cutting, but lessened the increases of these on second and following cuttings as a result of the retardation of regrowth. 3. Narrow row spacing and dense population increased forage yields in consequence of the increase of number of stem per unit area and the promotion of growth rate. The interactions between these treatments and cutting frequency were significant, that is, the effects of narrow row spacing and dense population increased remarkably when the period of cutting was short. In narrow row spacing and dense population the growth rates after cuttings were rapid but when the next time of cutting was too late the retard of regrowth came out. On the contrary when the period to next cutting was short the retardation of regrowth was mitigated. 4. As described above short cutting period increased forage yields by mitigating the retardation of regrowth. The interactions between cutting period and row spacing or plant population were significant. In the practices such as narrow row spacing, dense population and irrigation the retard of regrowth after cutting were liable to happen. In these cases it is desirable to cut in short period. 5. High cutting decreased slightly forage yields by the increase of remaining parts after cutting. Amounts of remaining parts after cutting influenced little on subsequent regrowth ; there-fore it is not necessary to make high cutting in New-sorgo culture.

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