ISHS Acta Horticulturae 563: International Conference on Environmental Problems Associated with Nitrogen Fertilisation of Field Grown Vegetable Crops
FERTILISING VALUE AND MINERALISATION OF NITROGEN FROM ORGANIC FERTILISERS (POT AND INCUBATION EXPERIMENTS) |
| Authors: | C. Cordovil, F. Cabral, M. Dachler |
| Keywords: | clay soil, horn meal, municipal solid waste, potato, poultry manure, ryegrass, sandy soil |
| Abstract:
Excessive use of mineral fertilisers can result in economic and environmental penalties. Alternatively organic wastes can be recycled to provide a source of plant nutrients, especially N, as well as enhancing future crop production by improving soil quality. An incubation experiment was carried out using different wastes: municipal solid wastes (MSW), poultry manure (PM) and horn meal (HM), and a Cambic arenosol soil. Incorporation of the wastes always led to an increase of potentially available N in the soil/residue mixture. Mineralisation rates were higher when residues were incorporated into the soil, compared to soil organic matter alone. A pot experiment was set up with a 1:1 mixture of Chernozeme soil and quartz sand, using ryegrass (Lolium perene L.) and potato (Solanum tuberosa L.) as test crops. The fertilising values of MSW, PM and HM were compared with a range of mineral nitrogen fertiliser rates (0.0, 0.5, 1 and 2 g N/pot). Residues tested on ryegrass had similar effects on growth as the application of 0.5 g N. Plants grown with 1 and 2 g N produced higher total yields, although on the first cut the dry matter obtained was lower. HM seemed to be more efficient than other residues in terms of growth and uptake of N by both species tested. | |
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