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Ammonia volatilization from blends with stabilized and controlled-released urea in the coffee system

机译：咖啡系统中稳定和控释尿素的混合物中的氨挥发

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Application of stabilized and controlled-release urea blends can reduce the losses of N-NH 3 as compared to conventional urea. The aim of this study was to quantify ammonia volatilization from conventional nitrogen fertilizers and blends of urea + (urea + NBPT) + controlled release urea applied in drip irrigated coffee system. The experiment was conducted under field conditions in in a Red Latosol located in Lavras-MG, Brazil. The randomized complete block design with six treatments: Urea = 450 kg ha -1 yr -1 N (100% of the recommended dose) divided in three splittings equal to 150 kg ha -1 N with an interval of 50 days; ammonium nitrate = 450 kg ha -1 yr -1 N (100% of the recommended dose) in three splittings equal to 150 kg ha -1 N with an interval of 50 days; Polyblen Extend (r) -100%= 450 kg ha -1 yr -1 (100% of the recommended dose) applied in two splittings, 315 kg ha -1 N in the 1?o split and 135 kg ha -1 N in the 2?o split; Polyblen Extend (r) -70% = 315 kg ha -1 yr -1 N (70% of the recommended dose) in two splittings, 220.5 kg ha -1 N in the 1?o split and 94.5 kg ha -1 N in the 2?o split; Polyblen Montanha (r) -100% = 450 kg ha -1 yr -1 (100% of the recommended dose) in an unique application in the 1?o split and Polyblen Montanha (r) -70% = 315 kg ha -1 yr -1 N (70% of the recommended dose) at an unique application in the 1?o split, with three repetitions. Total accumulated N-NH 3 losses followed the decreasing order: Urea (83.2 kg ha -1 N) > Polyblen Extend (r) - 100% (60.3 kg ha -1 N) > Polyblen Montanha (r) - 100% (46.8 kg ha -1 N) > Polyblen Extend (r) - 70% (35.1 kg ha -1 N) > Polyblen Montanha (r) - 70% (24.2 kg ha -1 N) > nitrate ammonium (2.0 kg ha -1 N ). The use of Polyblen Montanha (r) decreases two splittings compared to conventional sources such as urea and ammonium nitrate, by applying only 70% of the recommended dose without affecting yield and coffee crop nutrition.
机译：与常规尿素相比，稳定和控释尿素混合物的应用可以减少N-NH 3的损失。这项研究的目的是量化滴灌咖啡系统中常规氮肥和尿素+（尿素+ NBPT）+控释尿素的混合物中氨的挥发。该实验是在巴西Lavras-MG的Red Latosol的野外条件下进行的。随机完整区组设计，有六种治疗方法：尿素= 450 kg ha -1 yr -1 N（建议剂量的100％），分为三等份，每150公斤ha -1 N，间隔50天;硝酸铵= 450千克ha -1 yr -1 N（建议剂量的100％），分为三等份，每次150千克ha -1 N，间隔50天; Polyblen Extend（r）-100％= 450 kg ha -1 yr -1（推荐剂量的100％）分两次使用，一次分装时为315 kg ha -1 N，第二次为135 kg ha -1 N 2分Polyblen Extend（r）-70％= 315千克ha -1 yr -1 N（建议剂量的70％）分两次分裂，1°分裂中220.5 kg ha -1 N和94.5 kg ha -1 N 2分Polyblen Montanha（r）-100％= 450 kg ha -1 yr -1（推荐剂量的100％）在1？o分割中的独特应用和Polyblen Montanha（r）-70％= 315 kg ha -1 yr -1 N（建议剂量的70％）在1？o分离中独特的应用，重复3次。累积的总N-NH 3损失按照降序排列：尿素（83.2 kg公顷-1 N）> Polyblen Extend（r）-100％（60.3 kg ha -1 N）> Polyblen Montanha（r）-100％（46.8 kg ha -1 N）> Polyblen延伸（r）-70％（35.1 kg ha -1 N）> Polyblen Montanha（r）-70％（24.2 kg ha -1 N）>硝酸铵（2.0 kg ha -1 N） 。与常规来源（例如尿素和硝酸铵）相比，使用Polyblen Montanha（r）减少了两次分裂，方法是仅施用建议剂量的70％，而不影响产量和咖啡作物营养。

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