The effects of manure and NPK fertilizers on the soil microorganisms in a Danish long-term field experiment [microbial biomass, microbial activity, enzymatic activity]
1980
Eiland, F. (Statens Planteavls-Laboratorium, Lyngby (Denmark))
Microbial biomass, microbial activity and enzymatic activity were examined in soil samples originating from a field experiment, which was initiated in 1893 at the Askov Experimental Station. The unmanured, manured and fertilized plots, respectively, were since that time treated in the same way. The results of the microbiological investigations varied with the time of the soil samplings. On an average of all soil samplings, plate counts of fungi, ATP content, oxygen uptake and dehydrogenase activity yielded the highest results for the fertilized soil, lower results for the manured soil and the lowest results for the unmanured soil (control). Plate counts of bacteria and the biomass determined by fumigation according to Jenkinson yielded the highest results for the manured soil. In general, the differences between the microbiological results for unmanured, manured and fertilized soils were small.
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