ISHS Acta Horticulturae 178: Symposium on Nutrition, Growing Techniques and Plant Substrates
NUTRIENT CONTENT OF TOWN WASTE COMPOST AS A BASIS FOR FERTILIZER RECOMMENDATIONS OF TOWN WASTE CONTAINING SUBSTRATES |
| Authors: | D. Alt, M. Höfer |
| Abstract:
Town waste compost may be used succesfully as a component of substrates for growing woody or other ornamental plants in containers. However according to the high salt content (on average 9,1 g salt/l substrate) it is recommended to dilute the town waste compost 1:1 with peat or bark. Standardization of fertilizer programs has to take into consideration the nutrient content of the compost. Therefore we analysed 10 –12 composts/year during a sampling period of 5 years. N-contents are on average very low, however in some cases so high that they must be known to avoid overfertilization. P-contents were normal but availibility is probably too low, so extra supply may be necessarry. Contrary K-contents are very high, therefore no potassium should be supplied at the beginning of the cropping period. Mg and trace elements are high, therefore no further supply to mixtures of peat and town waste is necessary. | |
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