Studies on Productivities of Corn as Silage Materials and Cropping Combination of Varieties Different in Maturation Dates for North-Eastern Areas of Hokkaido : VII. A Proposition of Hokkaido Relative Maturity Scale

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  • 寒冷地におけるサイレージ用トウモロコシの原料生産特性と早晩性品種群の配合に関する研究 : VII.北海道相対熟度(HRM)の提案
  • 寒冷地におけるサイレージ用トウモロコシの原料生産特性と早晩性品種群の配合に関する研究-7-北海道相対熟度(HRM)の提案
  • カンレイチ ニ オケル サイレージヨウ トウモロコシ ノ ゲンリョウ セイサン

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Appropriate expression on the maturity is necessary for the right combination among varieties of silage corns. Current expressions like early and "very late" as well as the relative maturity scale in current use are not accurate enough for this purpose. I propose here "Hokkaido Relative Maturity" (HRM) Scale, which takes characteristics local dependence of corn growth rate on temperature. HRM is calculated by the equation: Σ(SHU)/HU=HRM (Days), where Σ(SHU) is simple sum of heat units accumulate between seeding and the best cutting stage for silage materials, that is untile the DM value reach 30% of the whole crop, and HU is an average of daily mean temperature above 0.1℃ over twelve locations. HU is equal to 17.5℃. The HRM values of "Wase-homare" and "Hokuyu" are 130 and 147 days, respectively.

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