Plant Soil Environ., 2003, 49(12):560-564 | DOI: 10.17221/4194-PSE

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, K. Sýkora
Czech University of Agriculture in Prague, Czech Republic

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

Published: December 31, 2003  Show citation

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Černý J, Balík J, Pavlíková D, Zitková M, Sýkora K. The influence of organic and mineral nitrogen fertilizers on microbial biomass nitrogen and extractable organic nitrogen in long-term experiments with maize. Plant Soil Environ. 2003;49(12):560-564. doi: 10.17221/4194-PSE.
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