The influence of organic and mineral nitrogen fertilizers on microbial biomass nitrogen and extractable organic nitrogen in long-term experiments with maize
2003
Cerny, J. | Balik, J. | Pavlikova, D. | Zitkova, M. | Sykora, K. (Ceska Zemedelska Univ., Prague (Czech Republic))
Microbial biomass nitrogen and extractable organic N 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 N was measured for manure treatment, it was by 38-133 % higher than for the control. In treatments with applications of mineral N fertilizers microbial biomass N was lower by 22-30 % than in the control. Extractable organic N was also lower in treatments with mineral N fertilizers in comparison with the control: by 23 % in ammonium sulphate treatment and by 29 % in DAM. The highest concentration of extractable organic N was determined for manure treatment. There was a positive correlation (r=0.44-0.9) between microbial biomass N and extractable organic N in the extractions.
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