Studies on the Productivities of Corn as Silage Materials and Cropping Combination of Varieties Different in Maturation Dates for North-eastern Area of Hokkaido : IV. Distribution map based on the heat-unit accumulation and combinations of varieties in Hokkaido district

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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 : IV.地帯区分と品種配合
  • 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-4-地帯区分と品種配合
  • 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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The maps of local climatic regions in Hokkaido were made by using the simple daily cumulative temperature (SDCT), that is (T.max+T.min)/2, where T.max is maximum temperature and T.min is minimum temperature, and the combination of varieties having different maturing dates were tested in each zone under various planting and cutting schedule. The results obtained were as follows. 1. Hokkaido district were classfied into six zones by one range of each zone having the SDCT of 150℃ (Fig.1). 2. In the zones C, D and E where the SDCT were less than 2, 600℃, it was estimated that the combinations of varieties constituted mainly with early varieties and supplementarily with medium varieties. In the zones A and B situated in the warmer areas of Hokkaido, the combinations were estimated to constitute with both medium and late varieties. 3. In the zones D and E, there was no variety at present which had dry matter contents of 30% in normal cutting stage. So, it was better to use only early maturing varieties in the present combinations. The needs of developing two groups of earlier varieties were recognized for good combination in those areas.

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