北海道中央部における春播コムギの初冬播栽培に関する研究　　適正播種量について

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  • Cultivation by Early Winter Seeding of Spring Wheat in Central Hokkaido. Suitable seeding density.
  • ホッカイドウ チュウオウブ ニ オケル ハルマキ コムギ ノ ショトウマキ サイバイ ニ カンスル ケンキュウ テキセイ ハシュリョウ ニ ツイテ

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Previously we found that suitable seeding days for early winter sowing of spring wheat was about 20-25 days before the start of continuous snow covering. In the present study, we examined the effect of several germination restraint chemicals (Silicon, Acetic acid vinyl, etc.) and seeding density on the yield to endure a higher yielding than spring seeding. Using these chemicals we could increase the number of overwintering plants, and obtained a high yield with a good quality even when seeded earlier than the standard seeding days. As a result, we judged that 178 or more of the overwintering plants per m necessary to obtain over 95% of the potential yield. When the seeding density was 1.5 times or 2 times as high as the standard density for spring wheat (340 grains per in, the ear number was higher than the standard. However, the ear length and 1000 -grain weight were lower, so that the yield with a higher seeding density was similar to that with a standard seeding density. The overwintering rate was 40-89% even when seeded on suitable days. From these results, we concluded that seeding at a density of 445 grains per m sufficient to obtain 95% of the potential yield, because 178 plants per m of 445 plants) is expected to overwinter after seeding at this density.

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