Sammanfattning

A laboratory study was performed to determine decomposition of fatty aicds and mineralization of C and N from slurries in soil. Fatty acids present in slurries decomposed within 1 - 2 days at 25-degrees-C in soil. Parallel to the fatty acid decomposition, immobilization of N was measured in soil. The correlation between the initial fatty acid concentrations in the slurries and the amounts of N immobilized were found to be highly significant (R2 = 0.97). It was concluded that fatty acids act as an easily decomposable C source for microorganisms and cause immobilization of N. Immobilization of N was followed by a curvilinear mineralization of N in all slurry-treated soils. Despite mineralization, only fresh pig slurry and anaerobically digested pig slurry showed a net release of N over 70 days whereas cattle slurry and anaerobically fermented pig slurry did not. The percentage of slurry C evolved during 70 days was fresh pig slurry, 65%; anaerobically fermented pig slurry, 48%; anaerobically digested pig slurry, 45%; and anaerobically fermented cattle slurry, 42%.

Nyckelord

ACETATE; PROPIONATE; BUTYRATE; N-IMMOBILIZATION; ANIMAL SLURRY

Publicerad i

Biology and Fertility of Soils
1993, Volym: 15, nummer: 3, sidor: 161-164
Utgivare: SPRINGER VERLAG

SLU författare

• Kirchmann, Holger

  • Institutionen för markvetenskap, Sveriges lantbruksuniversitet
    

• Lundvall, Anders

  • Institutionen för markvetenskap, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Jordbruksvetenskap
Markvetenskap


Publikationens identifierare

DOI: https://doi.org/10.1007/BF00361605

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/44237