Data from: Ammonia volatilization from putting greens foliarly-fertilized by conventional or stabilized urea

Low cost, high N-content, and favorable handling characteristics of urea fertilizer (46-0-0) make its use common in turfgrass management. While many investigations confirm incomplete recovery of foliarly-applied urea-N by turfgrass putting greens, the efficacy of urease-inhibiting additives, calcium-maleic-itaconic polymer or N-(n-butyl) thiophosphoric triamide (NBPT), in preventing NH3 volatilization is currently undocumented. Meanwhile, NH3 emissions reduce air and water quality. From 2014 to 2015, NH3 volatilization was measured 0- to 24-hours following foliar application of conventional or stabilized urea fertilizers to ‘Penn G2’ creeping bentgrass (Agrostis stolonifera L.) putting greens at a 20 kg ha–1 N rate in four separate trials. Using a 63% ‘trapping-efficiency’ flux chamber system under the duration and conditions described, 11.1% of conventional or calcium-maleic-itaconic polymer-amended urea-N was lost as NH3. Alternatively, combined amendment by NBPT and dicyandiamide (DCD) prevented 1.3 to 1.4 kg ha–1 NH3-N emissions, reducing volatilization loss to only 3.8 to 4.6% of the foliarly-applied urea-N.尿素肥料（46-0-0）具有低成本、高氮含量与优良施用特性，使其在草坪草管护中应用广泛。尽管多项研究证实，高尔夫果岭草坪对叶面喷施的尿素态氮回收率较低，但脲酶抑制剂添加剂（包括马来酸-衣康酸钙聚合物或N-(正丁基)硫代磷酰三胺（NBPT））在抑制氨挥发方面的效果目前尚未见报道。与此同时，氨挥发排放会降低空气与水体质量。2014至2015年，研究人员开展四项独立试验，以20 kg·ha⁻¹的施氮量，向种植‘Penn G2’匍匐翦股颖（Agrostis stolonifera L.）的高尔夫果岭喷施常规尿素或稳定化尿素肥料，并在喷施后0至24小时内测定氨挥发量。采用捕集效率为63%的通量箱系统，在上述试验周期与环境条件下开展测定，结果显示，常规尿素或经马来酸-衣康酸钙聚合物改性的尿素态氮中，有11.1%以氨的形式损失。与之相比，采用NBPT与双氰胺（DCD）复配改性的尿素肥料，可减少1.3至1.4 kg·ha⁻¹的氨态氮排放，将挥发损失率降至叶面喷施尿素态氮的3.8%至4.6%。