Sidedressing liquid swine (Sus scrofa) manure (LSM) on corn (Zea mays L.) may provide additional time to apply manure and help better match crop‐nutrient demand with nutrient supply. A 2‐yr, on‐farm study was conducted in Minnesota to assess three sidedress nutrient sources—injected LSM via dragline hose, anhydrous ammonia (AA), and urea ammonia nitrate (UAN)—against a non‐sidedressed control. At planting, all treatments (including the control) received 46 kg N ha⁻¹ as starter fertilizer. At sidedressing, 157 kg N ha⁻¹ of available N was targeted for application with the different N sources at the fourth leaf collar stage of corn (V4). Sidedressing did not affect plant population compared with the non‐sidedressed control in 2018, but sidedressed LSM reduced plant population by 6% relative to the control in 2019, likely due to wet soil conditions and manure injection settings that partially buried plants. In 2018, LSM produced comparable grain yield and net return to sidedressing costs as AA and UAN, despite lower soil ammonium and nitrate levels in the 0‐ to 15‐cm soil layer approximately 12 d after application. In 2019, LSM led to 18–25% lower grain yield than AA and UAN and lower net returns because of a combined plant population reduction and an application of 50 kg plant available N ha⁻¹ less than expected. Sidedressing corn with LSM is a viable alternative to commercial fertilizers, although to realize consistent results, better fine‐tuning of application rate, depth, and speed under different soil moisture conditions may be needed.

中文翻译：

---

液态猪粪作为玉米的氮肥

在玉米（Zea mays L.）上补充液体猪（Sus scrofa）粪肥（LSM）可能会提供更多的施肥时间，并有助于更好地满足作物对养分的需求与养分的供应。在明尼苏达州进行了一项为期2年的农场研究，以评估三种作物的营养素来源（通过拉索软管，无水氨（AA）和硝酸尿素氨水（UAN）注入的LSM）与非肥料的对照。播种时，所有处理（包括对照）均以46 kg N ha ^-1作为起肥。追肥时157 kg N ha ^-1N的可利用氮的目标是在玉米（V4）的第四个叶领阶段与不同的N源一起施用。与2018年的非对照相比，追施对植物种群没有影响，但是相对于2019年的对照，追施LSM使植物种群减少了6％，这可能是由于潮湿的土壤条件和肥料注入设置部分掩埋了植物。尽管施用后约12 d，0至15 cm土层中的土壤铵盐和硝酸盐含量较低，但LSM在2018年产生了与AA和UAN相当的谷物单产和净返耕成本。在2019年，LSM导致谷物产量比AA和UAN降低18–25％，并且净收益降低，这是由于植物种群减少和应用了50 kg可用植物N ha ^-1低于预期。尽管要获得一致的结果，在不同土壤湿度条件下可能需要更好地调整施用量，施用深度和施用速度，但使用LSM替代玉米是​​可行的替代商业肥料的方法。