Kinetic models fitted to nitrogen mineralization potential in soils amended with municipal compost and urban sewage sludge

Filipe Pedra, Alfredo Polo, Corina Carranca, Alexandra Ribeiro, Herminia Domingues

Research output: Contribution to journalArticlepeer-review

Abstract

An experimental incubation was conducted to study and describe the dynamics and kinetics of nitrogen (N) mineralization, using six
different kinetic models, on two different soils, amended with municipal solid waste compost (MSWC) and sewage sludge (SS). For this
purpose, a pot experiment was carried out, under semi-controlled conditions and without crop, in a complete randomised block design,
with application of seven levels of organic amendments (0, 15, 30 and 60 t ha-1 for both MSWC and SS). The two contrasting texture soils were an Haplic Podzol (PZha) and a Calcic Vertisol (VRcc). The soil samples were collected at the end of 1st, 2nd, 3th, 4th and 8th weeks and mineral N was measured. The kinetic models applied showed a lower fitting for the PZha soil than to the VRcc soil. However, for both soils the best determination coefficients were obtained with the simple and the double exponential models. The results suggested that to choose the model that better fits N mineralization data soil texture must be considered and soils should be modeled separately.
Original languageEnglish
Pages (from-to)144-146
Number of pages3
JournalDynamic Soil, Dynamic Plant 5
Volume2
Issue numberNA
Publication statusPublished - 1 Jan 2011

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