The influence of long-term organic and mineral fertilization on soil organic matter
2008
Simon, T.,Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic)
Soil organic matter quantity (organic C and N content) and quality (hot water extractable C content (HWC), aliphatic compounds, microbial biomass C content, basal respiration activity) was determined in soils differently fertilized (NPK - mineral fertilization: 64.6 kg N/ha/year, FYM - farmyard manure: 38.6 kg N/ha/year, FYM + NPK: 103.3 kg N/ha/year) in a long-term field experiment established in Prague (Czech Republic) in 1955. Nine years crop rotation (45% cereals, 33% root crops, 22% fodder crops) is practiced in this experiment. Soil samples were taken from the arable layer (0-20 cm) in spring over the period of 1994-2004. Continual application of FYM and FYM + NPK significantly increased concentrations of organic C, HWC, aliphatic compounds and microbial biomass C. Mineral fertilization (NPK) increased only organic C conc. The total N conc. was increased significantly only in FYM + NPK variant. The lucerne in crop rotation contributed positively to the total N conc. C:N ratio varied from 9.96 to 10.46. Most of the measured characteristics tended to be constant or slightly increased in the studied period.
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