Manure injection alters the spatial distribution of manure by concentrating it in a subsurface band which can lead to differential soil nutrient distribution and growth in small grains. This study assessed the effects of fall manure applications on soil NO₃-N, active carbon, and small grain growth compared to broadcasting and a no manure control. Soil samples were taken to represent whole plot soil means for all treatments, while in-band (IB) and between-band (BB) soil samples were taken in injected plots to assess nutrient spatial distribution after injection. Small grain forage samples were also taken IB and BB to assess the effects of manure injection on small grain growth. Soil samples were analyzed for NO₃-N, permanganate oxidizable carbon (POXC), and carbon mineralization (C-min), while small grain dry matter (DM) yield and forage quality parameters were measured from plant samples. Manure injection did not result in any differences between whole plot injection and broadcast soil NO₃-N concentrations. However, injection resulted in initially elevated soil NO₃-N concentrations IB compared to BB. There were no differences in soil POXC or C-min under manured versus unmanured soils, nor between IB and BB samples. Manure injection did not increase small grain DM yield or forage quality compared to broadcasting, nor were these measurements altered IB and BB. Even though manure injection altered the spatial distribution of soil NO₃-N, it did not affect soil C-min, POXC, or small grain growth under the conditions seen in this study. Therefore, differential small grain growth and quality is likely not a concern under injection.

中文翻译：

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粪肥注入对土壤硝酸盐、碳和小粒生长空间变异的影响

粪肥注入通过将粪肥集中在地下带来改变粪肥的空间分布，这可能导致土壤养分分布差异和小颗粒生长。_{本研究评估了与撒播和不施肥对照相比，秋季施肥对土壤 NO 3} -N、活性炭和小粒生长的影响。采集的土壤样品代表所有处理的整个地块土壤平均值，而在注入地块中采集带内（IB）和带间（BB）土壤样品以评估注入后养分的空间分布。还采集了 IB 和 BB 小粒饲料样品，以评估粪肥注入对小粒生长的影响。分析土壤样品中的 NO ₃ -N、高锰酸盐可氧化碳 (POXC) 和碳矿化度 (C-min)，同时测量植物样品中的小粒干物质 (DM) 产量和饲料质量参数。粪肥注入没有导致整块地注入和撒播土壤NO ₃ -N 浓度之间存在任何差异。然而，与BB相比，注射导致IB最初土壤NO _{3 -N浓度升高。}施肥土壤与未施肥土壤下的土壤 POXC 或 C-min 没有差异，IB 和 BB 样品之间也没有差异。与撒播相比，施肥并没有增加小粒干物质的产量或草料质量，这些测量结果也没有改变 IB 和 BB。尽管粪肥注入改变了土壤NO ₃ -N 的空间分布，但在本研究的条件下，它并不影响土壤C-min、POXC 或小粒生长。因此，小晶粒生长和质量的差异可能不是注入时需要考虑的问题。