About 80 different biogenic waste composts were tested by new or modified conventional microbiological methods (oxygen-consumption, DMSO-reduction, Ehand pH-drop during anaerobic incubation, reference method: self-heating-capacity) to determine the state of maturity and the effect of composts on plant growth in pot-trials. The progress in ripening of composts could be proved well by oxygen- consumption, pH-drop and self-heating-capacity, while DMSO-reduction and Eh-drop reflected maturity only with restrictions. A satisfactory prediction of plant-growth (dry-matter-production of oats) after compost-application with the help of the biological parameters was scarcely possible, only pH-drop showed a somewhat higher correlation. It was found out, however, that the effect of compost on plants could be estimated well by making use both of the C/N-ratio and of biological parameters.
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- Biological Parameters to Estimate the Effect of Biogenic Waste Composts on Plant Growth in Pot Trials
Dipl.Ing.agr. L. Popp
Prof. Dr. P. Fischer
- Springer Netherlands