Predicting N2O Emission from Upland Cultivated with Pepper through Related Soil Parameters

An empirical model of nitrous oxide emission from agricultural soil has been applied. It is based on the relationship between and three soil parameters, soil mineral N(ammonium plus nitrate) content in the topsoil(0-15cm), soil water-field pore space, and soil temperature, determined in a study on clay loam and sandy loam at the pepper field in 2004. For comparisons between estimated and observed values of emissions in the pepper field, it was investigated that amount in the clay loam and sandy loam were overestimated as 12.2% and less estimated as 30%, respectively. However, emissions were overestimated as 27.1% in the clay loam and 14.7% in the sandy loam from gas samples collected once a week at the same time analyzing soil parameters. This modelling approach, based as it is well established and widely used soil measurements, has the potential to provide flux estimates from a much wider range of agricultural sites than would be possible by direct measurement of emissions.

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