Factors Affecting the Effect of Nitrogen Application after Anthesis on Grain Protein Content and Yield of Spring Wheat Variety "Haruyokoi" in Northern Hokkaido

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  • 北海道北部地域における春まきコムギ「春よ恋」に対する開花期以降の尿素葉面散布が子実タンパク質含有率と収量に及ぼす効果およびその変動要因
  • 栽培 北海道北部地域における春まきコムギ「春よ恋」に対する開花期以降の尿素葉面散布が子実タンパク質含有率と収量に及ぼす効果およびその変動要因
  • サイバイ ホッカイドウ ホクブ チイキ ニ オケル ハルマキ コムギ ハルヨ コイ ニ タイスル カイカキ イコウ ノ ニョウソ ヨウメン サンプ ガ シジツ タンパクシツ ガンユウリツ ト シュウリョウ ニ オヨボス コウカ オヨビ ソノ ヘンドウ ヨウイン

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Abstract

Spring wheat variety “Haruyokoi” was cultivated with different basal nitrogen applications at three locations in northern Hokkaido. Foliar spray of nitrogen as urea was conducted three times (0.92 g m-2/time per application) at the anthesis time, 7 days later, and 14 days later, and the grain protein content (GPC) and yield were investigated. These three applications resulted in a significant increase in GPC. Yield and 1000-grain weight were also increased. In lodged plants or younger plants with yellow leaves, the effect was not strong. The relationship between GPC with foliar application (y) and GPC without foliar application (x) was shown by the regression formula; y=0.790x+3.6 (9.6 < x < 13.9, n=25, r=0.973, p < 0.01). Because the nitrogen content varied with the amount of basal nitrogen applied, we suppose that the effect of foliar application is influenced by the nitrogen fertilization condition.

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