A SIMPLE-MODEL FOR ESTIMATING THE CONTRIBUTION OF NITROGEN MINERALIZATION TO THE NITROGEN SUPPLY OF CROPS FROM A STABILIZED POOL OF SOIL ORGANIC-MATTER AND RECENT ORGANIC INPUT

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dc.contributor.authorMATUS, FJ
dc.contributor.authorRODRIGUEZ, J
dc.date.accessioned2025-01-21T01:35:33Z
dc.date.available2025-01-21T01:35:33Z
dc.date.issued1994
dc.description.abstractA simple model was developed to estimate the contribution of nitrogen (N) mineralization to the N supply of crops. In this model the soil organic matter is divided into active and passive pools. Annual soil mineralization of N is derived from the active pool. The active pool comprises stabilized and labile soil organic N. The stabilized N is built up from accumulated inputs of fresh organic N during a crop rotation but the labile N is a fraction of total N added, which mineralizes faster than the stabilized N. The passive pool is considered to have no participation in the mineralization process. Mineralization rates of labile and stabilized soil organic N from different crop residues decomposing in soil were derived from the literature and were described by the first-order rate equation dN/dt = -K*N, where N is the mineralizable organic N from crop residues and K is a constant. The data were grouped K-1 by short-term (0-1 year) and K-2 by long-term (0-10 years) incubation. Because the range of variation in K-2 was smaller than in K-1 we felt justified in using an average value to derive N mineralization from the stabilized pool. The use of a constant rate of K-1 was avoided so net N mineralization during the first year after addition is derived directly from the labile N in the crop residues. The model was applied to four Chilean agro-ecosystems, using daily averages of soil temperature and moisture. The N losses by leaching were also calculated. The N mineralization varied between 30 and 130 kg N ha(-1) yr(-1) depending on organic N inputs. Nitrogen losses by leaching in a poorly structured soil were estimated to be about 10% of total N mineralized. The model could explain the large differences in N- mineralization as measured by the potential N mineralization at the four sites studied. However, when grassland was present in the crop rotation, the model underestimated the results obtained from potential mineralization.
dc.fuente.origenWOS
dc.identifier.eissn1573-5036
dc.identifier.issn0032-079X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97695
dc.identifier.wosidWOS:A1994PC56200013
dc.issue.numero2
dc.language.isoen
dc.pagina.final271
dc.pagina.inicio259
dc.revistaPlant and soil
dc.rightsacceso restringido
dc.subjectMINERALIZATION RATE
dc.subjectNITROGEN
dc.subjectSTABILIZED ORGANIC MATTER
dc.subjectCROP ROTATION
dc.subject.ods15 Life on Land
dc.subject.ods02 Zero Hunger
dc.subject.ods14 Life Below Water
dc.subject.ods13 Climate Action
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa02 Hambre cero
dc.subject.odspa14 Vida submarina
dc.subject.odspa13 Acción por el clima
dc.titleA SIMPLE-MODEL FOR ESTIMATING THE CONTRIBUTION OF NITROGEN MINERALIZATION TO THE NITROGEN SUPPLY OF CROPS FROM A STABILIZED POOL OF SOIL ORGANIC-MATTER AND RECENT ORGANIC INPUT
dc.typeartículo
dc.volumen162
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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