Abstract
In addition to its environmental implications, ammonia volatilization is the principal source of variation of fertilizer efficiency. In a larger study estimating the effect of the dissolution step of fertilizer pellets on ammonia volatilization, we analyzed the sources of uncertainties in measuring low ammonia fluxes. The air humidity, and above all the air flow rate, are important contributors to the variation in fluxes. An exponential curve obtained from a set of 35 data points is proposed to normalize the ammonia emission rates according to the air flow rate (R 2 = 0.52). Modifications of the standard laboratory method are also proposed to improve the estimation of the low ammonia fluxes over a short timescale. However, the system was kept simple to manage, and reproducible to perform a statistical analysis of the results.
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