ABSTRACT This study sought to identify whether piggery effluent-derived nitrogen sources can be formulated with urea and nitrification inhibitors to better synchronize nitrogen (N) supply with crop demand than conventional urea fertilizer alone. A 288 pot pasture growth and leaching growth accelerator trial (5 pasture cuts) was completed with a factorial treatment structure of three N sources (2.63 g N [kg soil]−1 applied as 100% urea-N, 8% struvite-N + 92% urea-N, and 8% piggery pond sludge-N + 92% urea-N), five rates of three nitrification inhibitors (including 3,4-Dimethylpyrazole phosphate, DMPP; limonene+ethanol; and dicyandiamide, DCD), and matrix encapsulated forms of these inhibitors. Applying a combination of piggery sludge with urea increased N uptake during the first 4 weeks of plant growth (by 65%), though total N uptake throughout the trial (22 weeks) did not differ across the N-sources. The microbial community of the soil to which the sludge was added was significantly different from the un-amended soil at the conclusion of the trial. All inhibitor formulations significantly decreased leaching losses of mineral-N relative to the control (by 14 to 61%). The use of DMPP decreased initial nutrient uptake, deferring uptake until later in the experiment. Inhibitor addition resulted in microbial community effects that persisted throughout the trial. The study demonstrated that a piggery-derived N-source and a nitrification inhibitor can be used to manipulate plant N uptake to occur later or earlier in a growing period with equal cumulative uptake, achieving an 11% increase in residual N store, and decreased N leaching losses.

中文翻译：

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氮源和硝化抑制剂会影响季节性氮供应吗？

摘要 本研究旨在确定猪舍污水来源的氮源是否可以与尿素和硝化抑制剂一起配制，以比单独的传统尿素肥料更好地使氮 (N) 供应与作物需求同步。使用三种 N 源（2.63 g N [kg 土壤]-1 作为 100% 尿素-N、8% 鸟粪石-N + 施用）的因子处理结构完成了 288 个盆栽牧场生长和浸出生长加速器试验（5 次牧场切割） 92% 尿素氮和 8% 猪舍池污泥氮 + 92% 尿素氮），三种硝化抑制剂（包括 3,4-二甲基吡唑磷酸盐，DMPP；柠檬烯+乙醇；和双氰胺，DCD）的五种比率，以及这些抑制剂的基质封装形式。在植物生长的前 4 周（增加 65%），使用猪舍污泥和尿素的组合增加了氮的吸收，尽管整个试验（22 周）的总氮摄取量在 N 源之间没有差异。在试验结束时，添加了污泥的土壤的微生物群落与未改良的土壤显着不同。与对照相比，所有抑制剂制剂显着降低了矿物氮的浸出损失（降低了 14% 至 61%）。DMPP 的使用降低了初始养分吸收，将吸收推迟到实验后期。添加抑制剂导致微生物群落效应在整个试验过程中持续存在。该研究表明，猪舍衍生的 N 源和硝化抑制剂可用于控制植物 N 吸收，使其在生长期发生较晚或较早发生，累积吸收量相等，从而使残余 N 储存量增加 11%，并减少 N浸出损失。