ABSTRACT Mesoporous C (MC) has potential for controlling NH3 volatilization from fertilizer urea because of a high capacity for sorption of ions and gases, and so does sodium alginate (SA), a natural superabsorbent that has received considerable attention for developing slow-release fertilizers. Following stirred-flow experiments to evaluate both amendments for slowing urea release in water, novel studies were conducted that determined their impact on transformations of urea N during aerobic incubation of a sand and silt loam using 15N tracer techniques to unambiguously differentiate fertilizer from soil N. Neither amendment showed appreciable slow-release behavior nor had any significant effect on urea N transformations in the silt loam; however, NH3 volatilization from the sand was significantly decreased by up to 47% with SA and by up to 38% with MC, while SA also significantly increased NO3 − production by 42–114%. Taken together with the inherent advantages of a natural material that is widely available, economical, and biodegradable, the results reported indicate that SA has more potential than MC for enhancing the fertilizer value of urea.

中文翻译：

---

海藻酸盐和介孔碳提高尿素肥料价值的潜力

摘要 介孔碳 (MC) 具有高吸附离子和气体的能力，因此具有控制肥料尿素中 NH3 挥发的潜力，海藻酸钠 (SA) 也是如此，它是一种天然超强吸收剂，在开发缓释肥料方面受到了广泛关注. 在搅拌流实验评估减缓尿素在水中释放的两种改良剂之后，进行了新的研究，确定了它们在砂和粉砂壤土的有氧孵化过程中对尿素 N 转化的影响，使用 15N 示踪技术明确区分肥料和土壤 N。两种改良剂均未表现出明显的缓释行为，也未对粉砂壤土中的尿素氮转化产生任何显着影响；然而，沙子中的 NH3 挥发使用 SA 显着降低了 47%，使用 MC 降低了 38%，而 SA 也显着增加了 NO3 - 产量 42-114%。结合可广泛使用、经济且可生物降解的天然材料的固有优势，报告的结果表明，SA 比 MC 在提高尿素肥料价值方面具有更大的潜力。