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Nitrogen mineralization from organic farming fertilizers applied to a sandy loam soil

SUMMARY:
The application of on-farm composts is recommended to organic farmers as probably the most suitable ways of disposing wastes and increasing the amount of soil organic matter. However, an environmentally sound management of the use of these composts in organic farming demands a better knowledge of the rate of release of available nitrogen (N) from compost-amended soils to achieve both economic and environmental benefits.

So, a 4-month laboratorial aerobic incubation study was conducted in a sandy loam soil, under controlled conditions, to determine the nitrogen (N) mineralization rates of 5 on-farm composts and 3 commercial fertilizers all of them fulfilling the requirements for organic farming. Results show that no significant release of N occurred from the on-farm composts and at the end of the incubation study only 1.9-12% of the organic N added was mineralized. On the contrary for the commercial fertilizers mineralization occurred more intensively at the initial stages of the incubation, and at the end of this period the mineralization rates varied in a range between 26.6-42.5%. Incubation data were well described by the one-pool exponential mineralization model proposed by Stanford and Smith (1972), to estimate potentially mineralisable nitrogen from different mixtures of soil plus organic farming fertilizers.

Copyright:	© European Compost Network ECN e.V.
Quelle:	Orbit 2006 (September 2006)
Seiten:	6
Preis:	€ 0,00
Autor:	Fernanda Cabral H.M. Ribeiro E. Vasconcelos C.M.D.S. Cordovil Prof. A. Cristina Cunha Queda
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