Phosphorus fertilizer recommendations for continuously cultivated maize in consideration with the effect of arbuscular mycorrhizal fungi in Konsen, Japan

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  • 根釧地域の飼料用トウモロコシに対するアーバスキュラー菌根菌の効果を考慮したリン酸施肥基準
  • コンセンチイキ ノ シリョウヨウ トウモロコシ ニ タイスル アーバスキュラーキン コンキン ノ コウカ オ コウリョ シタ リンサン セヒ キジュン

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Abstract

<p>Arbuscular mycorrhizal fungi (AMF) are known to colonize plant roots and improve the phosphorus (P) uptake by their host plants, including maize (Zea mays L.). However, few studies have addressed the extent to which the application of P fertilizer can be reduced in the presence of AMF. Thus, the present study aimed to determine which P fertilizer application rates could be used without reducing the yield of continuously cultivated maize in Konsen, Japan.</p><p>The results of our field experiments demonstrated that maize yield was not significantly affected by reducing the application rate of P fertilizer, except when no P fertilizer was applied. Relative early growth rate was a useful measure for evaluating the effect of reduced P fertilizer application on maize yield. P fertilizer application rates that did not result in reduced yield were different depending on factors such as soil type, available phosphorus content, and AMF colonization. Based on relative early growth rate, we tentatively determined that P fertilizer application rates could be reduced by 20％ of the present standard in fields where maize is continuously cultivated.</p><p>The application of P fertilizer to maize could be further reduced if the effects of AMF on the P uptake of host plants are quantified more precisely under various cropping conditions.</p>

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