Supply of adequate P is critical at the early growth stages of corn (Zea mays L.), particularly under a cold environment like the northern Great Plains. The mutualistic relationship between arbuscular mycorrhizal fungi (AMF) and corn roots is responsible for supplying P. However, colonies of AMF drastically decline when corn follows a non‐host crop like sugarbeet (Beta vulgaris L.) in rotation. Field experiments were conducted at two sites during 2018 and 2019 seasons to determine the corn grain yield response to six P management practices, (a) without P, (b) recommended P, (c) P₂O₅ at the rate of 112 kg ha⁻¹, (d) starter at the rate of 13.7 kg P₂O₅ ha⁻¹, (e) commercial mycorrhizal inoculant, and (f) starter and mycorrhizal inoculant. Corn grain yield did not respond to P application across 4 site‐years. Application of 112 kg P₂O₅ ha⁻¹ had significantly higher grain yield (15.6 Mg ha⁻¹) than mycorrhizal inoculant (13.5 Mg ha⁻¹) only at one site in 2018. Lowest soil available P was observed with only mycorrhizal inoculant. For one site, AMF population was significantly reduced under without P (0.79 μmol kg⁻¹ soil) than recommended P application (1.79 μmol kg⁻¹ soil). Higher than recommendation P rate, commercial mycorrhizal inoculant and starter P did not increase grain yield over without P application.

中文翻译：

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我们是否需要向玉米甜菜中添加额外的磷？

在玉米（Zea mays L.）的早期生长阶段，充足的磷供应至关重要，特别是在北部大平原等寒冷环境下。丛枝菌根真菌（AMF）和玉米根之间的相互关系是提供P的原因。但是，当玉米轮作使用非甜菜作物（如甜菜（Beta vulgaris L.））时，AMF的菌落急剧减少。在2018年和2019年的季节中，在两个地点进行了田间试验，以确定玉米对六种磷管理措施的产量响应，（a）无磷，（b）推荐的P，（c）P ₂ O _5的施肥量为112 kg ha ^-1，（d）以13.7 kg P ₂ O ₅  ha的速率起动^-1，（e）商业菌根接种剂，和（f）起始剂和菌根接种剂。玉米产量在4个工作年中均未对施磷做出反应。仅在2018年的一个地点 施用112 kg P ₂ O ₅ ha ^-1的谷物产量（15.6 Mg ha ^-1）显着高于菌根接种剂（13.5 Mg ha ^-1）。仅使用菌根接种剂，土壤中可利用的磷最低。对于一个地点，在无磷情况下（0.79μmolkg ^-1 土壤），AMF种群数量明显低于推荐的磷施用量（1.79μmolkg ^-1） 泥）。高于建议的P施用率，商品菌根接种剂和起始剂P不会比不施用P的情况下增加谷物产量。