Studies on the Productivities of Corn as Silage Materials and Cropping Combination of Varieties Different in Maturation Dates in North-eastern Areas of Hokkaido : III. Constancy and requirement of some heat-unit accumulations for varieties

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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 : III.各種積算温度の一定性並びに品種群の必要温度
  • 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-3-各種積算温度の一定性並びに品種群の必要温度
  • 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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For the purpose of local assignment and combination of varieties different in maturing dates, the constancy and efficiency of some measures for heat-unit accumulation were investigated by data from 1963 to 1977 at various locations in Hokkaido, Japan. The results obtained were as follows: 1. The measure for heat-unit accumulation that had the least coefficient of variation through years within locations was the one accumulated temperature more than zero C. It was recognized that the heat-unit accumulated by this method had high utility than the others. It is called the simple heat-unit accumulation by the author. 2. From seeding to the best cutting stage for silage materials, that is 25-35% in dry matter percentage, the simple heat-unit accumulation in early, medium, late and latest varieties were estimated as 2,100-2,550, 2,250-2,700, 2,400-2,850 and 2,550-3,000℃, respectively. 3. The effective utilization of heat-unit accumulation on maize breeding for high yielding ability by augmenting seed germinability in low temperature conditions was discussed.

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