Ammonia volatilization (N-NH 3 ) is one of the main pathways of Nitrogen loss reducing nitrogen use efficiency in coffee orchard. This work aimed at quantifying ammonia volatilization (N-NH 3 ) losses from N-sources to be used in coffee plantations fertilization in Brazil. The experiment was conducted in the field on a dystrophic red latosol (Ferralsol in FAO's classification) at the Coffee Research Sector, University of Lavras, MG, Brazil. The experimental design was of complete randomized blocks with three repetitions of the following treatments: conventional urea, ammonium nitrate and urea + 0.15% Cu and 0.4% B, urea + anionic polymers, urea + elementary sulfur (S 0) + polymers, and urea + plastic resin. These N sources were split into three doses of 150 kg ha -1 and band applied. The N-NH 3 losses by volatilization and variations of pH (H 2 O) were measured, before and after N application. The N-sources contributed to reduce the soil pH, measured after the third nitrogen fertilization. The N-NH 3 losses by volatilization (average from three applications) was as follows: urea + anionic polymers (35.8%) > conventional urea (31.2%) = urea + S 0 + polymers (31.0%) > urea + 0.15% Cu + 0.4 % B (25.6%) > urea + plastic resin (8.6%) = ammonium nitrate (1.0%).
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机译：氨挥发（N-NH 3）是氮损失的主要途径之一，降低了果园的氮利用率。这项工作旨在量化巴西咖啡种植园施肥中氮源造成的氨挥发（N-NH 3）损失。该实验是在巴西MG的拉夫拉斯大学的咖啡研究部门对营养不良的红色番茄红素（粮农组织分类为Ferralsol）进行的。实验设计是完全随机的区块，具有以下处理的三个重复：常规尿素，硝酸铵和尿素+ 0.15％Cu和0.4％B，尿素+阴离子聚合物，尿素+元素硫（S 0）+聚合物和尿素+塑料树脂。将这N个源分成150 kg ha -1的三个剂量并施加频带。在施用氮之前和之后，通过挥发和pH（H 2 O）的变化测量了N-NH 3的损失。在第三次施氮后，氮源有助于降低土壤的pH值。挥发引起的N-NH 3损失（三种应用的平均值）如下：尿素+阴离子聚合物（35.8％）>常规尿素（31.2％）=尿素+ S 0 +聚合物（31.0％）>尿素+ 0.15％铜+ 0.4％B（25.6％）>尿素+塑料树脂（8.6％）=硝酸铵（1.0％）。
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