The influence of organic and mineral nitrogen fertilizers on microbial biomass nitrogen and extractable organic nitrogen in long-term experiments with maize

J. Černý, J. Balík, D. Pavlíková, M. Zitková and K. Sýkora
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J. Černý: Czech University of Agriculture in Prague, Czech Republic
J. Balík: Czech University of Agriculture in Prague, Czech Republic
D. Pavlíková: Czech University of Agriculture in Prague, Czech Republic
M. Zitková: Czech University of Agriculture in Prague, Czech Republic
K. Sýkora: Czech University of Agriculture in Prague, Czech Republic

Plant, Soil and Environment, 2003, vol. 49, issue 12, 560-564

Abstract: Microbial biomass nitrogen and extractable organic nitrogen in extractions by 0.05M K2SO4 and 0.01M CaCl2 were studied in a long-term experiment with successive growing of silage maize. The highest content of microbial biomass nitrogen was measured for manure treatment, by 38-133% higher than for the control. In treatments with applications of mineral nitrogen fertilizers microbial biomass N was lower on average by 22-30% against the control. Extractable organic nitrogen was also lower in treatments with mineral N fertilizers compared to the control: by 23% in ammonium sulphate treatment and by 29% in DAM. The highest content of extractable organic nitrogen was determined for manure treatment. There was a positive correlation (r = 0.44-0.9) between microbial biomass nitrogen and extractable organic nitrogen in the extractions by 0.01M CaCl2 and 0.05M K2SO4.

Keywords: long-term experiment; maize; microbial biomass nitrogen; extractable organic nitrogen (search for similar items in EconPapers)
Date: 2003
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:49:y:2003:i:12:id:4194-pse

DOI: 10.17221/4194-PSE

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