The anaerobic potentially mineralizable N (PMN) test combined with the preplant (PPNT) and presidedress (PSNT) nitrate tests may improve corn (Zea mays L.) N fertilization predictions. Forty‐nine corn N response experiments (mostly corn following soybean [Glycine max (L.) Merr.]) were conducted in the U.S. Midwest from 2014–2016 to evaluate the ability of the PPNT and PSNT to predict corn relative yield (RY) and N fertilizer over‐ and under‐application rates when adjusted by PMN. Before planting and N fertilization, PPNT (0–30, 30–60, and 60–90 cm) and PMN (0–30 cm) samples were obtained. In‐season soil samples were obtained at the V5 development stage for PSNT (0–30, 30–60 cm) in all N rate treatments and PMN (0–30 cm) in only the 0 and 180 kg N ha⁻¹ preplant N treatments. Increasing NO₃–N sampling depths beyond 30 cm with or without PMN improved RY predictability marginally (R² increase up to 0.20) and reduced over‐ and under‐application frequencies up to 14%. Including PMN (preplant only) with PPNT or PSNT improved RY predictability minimally (R² increase up to 0.10) only for coarse‐ and medium‐textured soils, but N fertilizer over‐ and under‐application frequencies were not substantially reduced (≤12%). These marginal improvements in RY predictability and N fertilizer over‐ and under‐application frequencies, regardless of the variables used (e.g., fertilization, sampling depth, soil texture, and growing degree‐day categories), demonstrate that including PMN with soil NO₃–N alone does not improve corn N fertilization need predictions enough to recommend their use.

中文翻译：

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通过将可矿化氮测试包括在种植前和硝酸盐硝酸盐测试中来调整玉米氮管理

厌氧性潜在矿化N（PMN）试验与预种植（PPNT）和Presidedress（PSNT）硝酸盐试验的结合可能会改善玉米（Zea mays L.）N施肥的预测。2014-2016年在美国中西部地区进行了49次玉米N响应试验（主要是大豆后的玉米[ Glycine max（L.）Merr。]），以评估PPNT和PSNT预测玉米相对产量（RY）的能力。通过PMN调整后，氮肥的过量使用和不足量。在播种和施氮之前，获得了PPNT（0–30、30–60和60–90 cm）和PMN（0–30 cm）样品。在所有N速率处理的V5发育阶段，均在PS5（0–30，30–60 cm）的V5发育阶段获得季节土壤样品，仅在0和180 kg N ha ^-1时获得PMN（0–30 cm）。种植前的N处理。在有或没有PMN的情况下，将NO ₃ –N采样深度增加到30 cm以上，可以稍微改善RY的可预测性（R ²增大至0.20），并将过量使用和不足使用频率降低多达14％。仅将PMN（仅前植体）与PPNT或PSNT配合使用时，仅对于中，中质地土壤，RY的可预测性最低（R ²增加至0.10），但氮肥过量施用和施用不足的频率并未显着降低（≤12％） ）。不论使用何种变量（例如，施肥，采样深度，土壤质地和生长日数类别），RY可预测性和氮肥过量施用和施用不足频率的这些边际改进都表明，将PMN包括在土壤NO _3中单独使用-N并不能改善玉米氮肥的需求预测，足以推荐其使用。