A comparison of in situ methods for measuring net nitrogen mineralization rates of organic soil amendments.
J Environ Qual
; 33(3): 1098-105, 2004.
Article
en En
| MEDLINE
| ID: mdl-15224949
ABSTRACT
In situ incubation methods may help provide site-specific estimates of N mineralization from land-applied wastes. However, there are concerns about the reliability of the data generated by the various methods due to containment artifacts. We amended a sandy soil with either poultry manure, biosolids, or yard-waste compost and incubated the mixtures using four in situ methods (buried bags, covered cylinders, standard resin traps, and "new" soil-resin traps) and a conventional laboratory technique in plastic bags. Each incubation device was destructively sampled at 45-d intervals for 180 d and net N mineralization was determined by measuring the amount of inorganic N that accumulated in the soil or soil plus resin traps. Containment effects were evaluated by comparing water content of the containerized soil to a field-reference soil column. In situ incubation methods provided reasonable estimates of short-term (< 45 d) N mineralization, but long-term (> 45 d) mineralization data were not accurate due to a variety of problems specific to each technique. Buried bags and covered cylinders did not retain mineralized N due to water movement into and out of the containers. Neither resin method captured all of the mineralized N that leached through the soil columns, but the new soil-resin trap method tracked field soil water content better than all other in situ methods evaluated. With further refinement and validation, the new soil-resin trap method may be a useful in situ incubation technique for measuring net N mineralization rates of organic soil amendments.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Contaminantes del Suelo
/
Fertilizantes
/
Nitrógeno
Tipo de estudio:
Evaluation_studies
Límite:
Animals
Idioma:
En
Revista:
J Environ Qual
Año:
2004
Tipo del documento:
Article
País de afiliación:
Estados Unidos