Effect of Timing of Nitrogen and Potassium Application in Combination with Local Application of Calcium Superphosphate on the Growth and Yield of Direct-seeded Onions (<i>Allium cepa</i> L.)

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  • Usuki Kazuei
    Large-scale Farming Research Division, Hokkaido Agricultural Research Center, NARO
  • Muro Takato
    Crop Breeding Division, Hokkaido Agricultural Research Center, NARO

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  • リン酸直下施肥と組み合わせた窒素・カリウム肥料の施用時期が春播き直播タマネギの生育・収量に及ぼす影響
  • リンサン チョッカ セヒ ト クミアワセタ チッソ ・ カリウム ヒリョウ ノ シヨウ ジキ ガ ハル マキ ジカマキ タマネギ ノ セイイク ・ シュウリョウ ニ オヨボス エイキョウ

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<p>The effect of nitrogen and potassium fertilization conditions combined with the local application (2–4 cm below the seeds) of calcium superphosphate on the bulb yield of direct-seeded onions (Allium cepa L.) was investigated. In addition, to clarify the effect of fertilization on the number of leaves during the growing period and the relationship with the number of leaves and yield, we investigated growth traits such as the early growth stage plant height and nutrient absorption in the bulb initiation stage, which may affect the number of leaves. Although the mechanism by which a fertilizer component applied before sowing, with the local application of calcium superphosphate, contributes to yield is still not completely understood, the results show that nitrogen and potassium application prior to the second leaf stage increases phosphate absorption and promotes nitrogen absorption in the bulb initiation stage. In addition, it leads to an increase in the number of leaves at the fall-over stage and the bulb weight per leaf. Moreover, this study shows that only applying calcium superphosphate locally does not increase the yield of ‘Okhotsk 222’, but that it requires combination with nitrogen and potassium application within the plow layer prior to the second leaf stage. This process promotes the absorption of nitrogen and phosphoric acid at the bulb initiation stage and contributes to an increase in bulb yield.</p>

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