Summary
In Ap horizons of typical arable soils under cereals in Northwest Germany, biological activity was estimated by measuring microbial activity. Twelve soils on local farms and six soils on a research farm were analysed. Microbial biomass, dehydrogenase activity, and alkaline phosphatase activity were compared with the biological availability of P, an index describing the relationship among several P fractions that has been used in ecological agriculture. The correlation between the microbial biomass and dehydrogenase and alkaline phosphatase activity was strong but the correlation between the biological availability of P and the enzyme activities was weak. In contrast, in the farm fields, there was a significant correlation between the microbial biomass and the biological availability of P. The correlation between the biological availability of P and pH was highly significant (r=0.65–0.93***). Explanations for these correlations are discussed and proposals for further investigations are made. (1) Is the pH effect a direct chemical one or an indirect biological one? (2) Which soil organisms affect the biological availability of P in contrast to the microbial biomass, dehydrogenase activity, and alkaline phosphatase activity? (3) Is the method suitable for the investigation of all arable soils?
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Beyer, L., Wachendorf, C., Balzer, F.M. et al. The use of biological methods to determine the microbiological activity of soils under cultivation. Biol Fertil Soils 13, 242–247 (1992). https://doi.org/10.1007/BF00340583
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DOI: https://doi.org/10.1007/BF00340583