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Effect of cattle slurry fractions on nitrogen mineralization in soil

Published online by Cambridge University Press:  27 March 2009

F. Diaz-Fierros ,
M. Carmen Villar ,
F. Gil ,
M. Carballas ,
M. Carmen Leiros ,
Tarsy Carballas  and
Ana Cabaneiro
F. Diaz-Fierros
Affiliation:
Instituto de Investigaciones Agrobiologicas de Galicia (C.S.I.C), Apartado 122, 15080 Santiago de Compostela, Spain
M. Carmen Villar
Affiliation:
Instituto de Investigaciones Agrobiologicas de Galicia (C.S.I.C), Apartado 122, 15080 Santiago de Compostela, Spain
F. Gil
Affiliation:
Instituto de Investigaciones Agrobiologicas de Galicia (C.S.I.C), Apartado 122, 15080 Santiago de Compostela, Spain
M. Carballas
Affiliation:
Instituto de Investigaciones Agrobiologicas de Galicia (C.S.I.C), Apartado 122, 15080 Santiago de Compostela, Spain
M. Carmen Leiros
Affiliation:
Instituto de Investigaciones Agrobiologicas de Galicia (C.S.I.C), Apartado 122, 15080 Santiago de Compostela, Spain
Tarsy Carballas
Affiliation:
Instituto de Investigaciones Agrobiologicas de Galicia (C.S.I.C), Apartado 122, 15080 Santiago de Compostela, Spain
Ana Cabaneiro
Affiliation:
Instituto de Investigaciones Agrobiologicas de Galicia (C.S.I.C), Apartado 122, 15080 Santiago de Compostela, Spain
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Summary

The mineralization kinetics of nitrogen in acid soils, and their modification by the addition of an organic fertilizer (cattle slurry), were studied by incubating a humic cambisol for 36 weeks using a method based on that of Keeney & Bremner (1967). The cumulative curve of the quantity of nitrogen mineralized in soil not given fertilizer departs significantly from Stanford's theoretical model, which predicts linear dependence of nitrogen mineralized upon √t. The observed kinetics are interpreted as due to the superposition of two mineralization processes involving different substrates.

The cumulative mineralized nitrogen curves for soil samples enriched with the various slurry fractions likewise reflect complex kinetics involving at least two main substrates. Consideration of the net mineralized nitrogen shows that F,, the solid fraction with the highest C/N ratio, clearly induced immobilization of nitrogen during the first 130 days of incubation, and analysis of the NO3/NH4 ratio suggests that this immobilization was probably at the expense of nitrate. F3, the liquid fraction, first induced a brief period of mineralization and then stabilized nitrogen levels, giving rise to a reduction in net mineralized nitrogen. The addition to the soil of F2, the semi-liquid fraction, produced results intermediate between those of the other two fractions.

In conclusion, the increase in organic nitrogen in the soil after addition of cattle slurry depends in the short term on the liquid and semi-liquid fractions, whereas long-term effects involve both the stable residues of these fractions and the more solid fraction. The labile fraction of the pool of mineralizable N benefits more than the recalcitrant fraction, and the time constants of the mineralization process are reduced.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 110 , Issue 3 , June 1988 , pp. 491 - 497
Copyright
Copyright © Cambridge University Press 1988

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