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[SANET-MG] is digested liquid swine manure compost?
published online 26 June 2007
Published in Agron J 99:1119-1129 (2007)
Use of Anaerobically Digested Swine Manure as a Nitrogen Source in Corn
Esteban R. Loriaa, John E. Sawyerb,*, Daniel W. Barkerb, John P.undvallb
and Jeffery C. Lorimorc
Swine (Sus scrofa) manure is an important source of N for crop
production. The processing of manure in an anaerobic digester for biogas
production is only a partial manure treatment process and is not
designed as a disposal method. However, digestion will alter manure
characteristics, and this may affect nutrient availability to crops. The
objective of this study was to evaluate the N supply to corn (Zea mays
L.) from swine manure before and after anaerobic digestion for biogas
production. Raw and digested swine manure were late-fall applied as main
plots, with three manure N rates as subplots, and six fertilizer N rates
as sub-subplots. Response to manure and fertilizer N was determined
through soil inorganic N, plant N status and uptake, and grain yield.
After 3 yr of study, results indicated no difference between raw and
digested swine manure as a source of N for plant use in the year of
application or in the residual year. Equivalence to fertilizer N was the
same with both raw and digested swine manure, and varied between years
with 100% in 2000, 44% in 2001, and 60% in 2002. These differences are
attributed to varying growing seasons and N loss potential from time of
late fall manure application compared with the spring-applied fertilizer
N. Late fall and early spring soil sampling indicated rapid conversion
to NO3 with both sources. Results of this work indicate that digested
liquid swine manure can readily supply plant-available N and management
for corn production should be the same as with raw swine manure.
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