Ammonia Volatilization from Ammonium or Ammonium-Forming Nitrogen Fertilizers

Environmental losses of soil-applied N-fertilizers through ammonia volatilization were examined. Volatilization trials were established in the vegetative phase of wild blueberry production in Nova Scotia (NS) and Prince Edward Island (PE) in 2004 and 2005. Treatments consisted of no fertilizer (control) and N applications (35 kg N ha-1) of ammonium sulphate (AS), diammonium phosphate (DAP), urea (U) and sulphur coated urea (SCU). When compared with the control, results indicated significantly elevated volatilization rates for U (303% NS in 2004, 274% PE in 2005), SCU (273% NS in 2004, 205% PE in 2005) and DAP (178% PE in 2005). Results indicate that volatilization losses are significant, site specific and may contribute to reductions in nutrient availability. Key words: Nitrogen, wild blueberry, environmental losses, ammonia, volatilization

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Corn Cropping System And Nitrogen Fertilizers Technologies Affect Ammonia Volatilization In Brazilian Tropical Soils

10.21203/rs.3.rs-1051385/v1 ◽

2021 ◽

Author(s):

César Ferreira Santos ◽

Sheila Isabel do Carmo Pinto ◽

Douglas Guelfi ◽

Sara Dantas Rosa ◽

Adrianne Braga da Fonseca ◽

...

Keyword(s):

Ammonia Volatilization ◽

Cropping System ◽

Tropical Soils ◽

Nitrogen Fertilizers ◽

Corn Yield ◽

N Removal ◽

Tillage System ◽

The Mean ◽

N Use ◽

T System

Abstract With the advance of the no-tillage system (NT system) in Brazil, the adoption of technologies for nitrogen fertilization in these soils become essential for increasing the efficiency of N use in the system. In this sense, the objective of this study was to quantify ammonia losses, N removal in grains, and with 2nd crop yield in NT system and conventional (T system) planting areas that received application of different N fertilizers and their technologies. Ammonia volatilization, N extraction in grains and corn yield in response to the application of conventional fertilizers were compared to urease inhibitors treated urea in NT and T systems. The treatments were: no-N (Control); Prilled urea (PU); urea + NBPT (UNBPT); urea + Cu + B (UCuB); ammonium nitrate (AN), and ammonium sulfate (AS). In the NT system, the N-NH3 losses were 49% greater than in the T system; without differences for corn yield. The fertilizers as AN, and AS had the lowest N-NH3 losses, regardless of tillage system. UNBPT reduced the mean N-NH3 loss by 33% compared to PU. UNBPT (1,200 mg kg-1) and UNBPT (180 mg kg-1) reduced by 72% and 22% the N-NH3 losses compared to PU in the NT system.

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Ammonia volatilization and yield components after application of polymer-coated urea to maize

Revista Brasileira de Ciência do Solo ◽

10.1590/s0100-06832014000400016 ◽

2014 ◽

Vol 38 (4) ◽

pp. 1200-1206 ◽

Cited By ~ 7

Author(s):

Eduardo Zavaschi ◽

Letícia de Abreu Faria ◽

Godofredo Cesar Vitti ◽

Carlos Antonio da Costa Nascimento ◽

Thiago Augusto de Moura ◽

...

Keyword(s):

Grain Yield ◽

Ammonia Volatilization ◽

Soil Surface ◽

Nitrogen Fertilizers ◽

Control Treatment ◽

Favorable Effect ◽

Nutritional Characteristics ◽

Coated Urea ◽

Polymer Coated Urea ◽

Spad Readings

A form of increasing the efficiency of N fertilizer is by coating urea with polymers to reduce ammonia volatilization. The aim of this study was to evaluate the effect of polymer-coated urea on the control of ammonia volatilization, yield and nutritional characteristics of maize. The experiment was carried out during one maize growing cycle in 2009/10 on a Geric Ferralsol, inUberlândia, MG, Brazil. Nitrogen fertilizers were applied as topdressing on the soil surface in the following urea treatments: polymer-coated urea at rates of 45, 67.5 and 90 kg ha-1 N and one control treatment (no N), in randomized blocks with four replications. Nitrogen application had a favorable effect on N concentrations in leaves and grains, Soil Plant Analysis Development (SPAD) chlorophyll meter readings and on grain yield, where as coated urea had no effect on the volatilization rates, SPAD readings and N leaf and grain concentration, nor on grain yield in comparison to conventional fertilization.

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