Abstract
A study was undertaken to quantify N mineralization and immobilization in a loamy-clayey soil upon application of K15NO3-N and 4 types of organic amendments (2 composts of domestic waste of different age (Cl and C3), residual waste from a treatment plant (B) and farmyard manure (F)). The study was carried out during a one month incubation at 25 °C. In the first experiment, the soil was incubated at a moisture content of 2/3 field capacity. In the second experiment, we had a wetting and drying cycle: wetting at 2/3 field capacity for 10 days, followed by drying for 10 days and re wetting to 2/3 field capacity for 10 days.
The mineralization and immobilization processes depended on the nature of the organic amendments, their degree of stability and their N content. The N-mineralization was correlated with the C/N ratio,%N, Hemicellulose (NDF-ADF), (cellulose + hemicellulose + lignin)/N ratio (NDF/N) and (lignin + cellulose)/N ratio (ADF/N). The N-immobilization was only correlated with the %ADF (% lignin and cellulose). The cycles of wetting and drying considerably increased the N mineralization. Application of organic amendments favoured the process of N immobilization. It decreased with the degree of stability of the organic materials. In contrast, wetting and drying cycles markedly decreased the amount of N-immobilization. Loss of nitrogen (2–20%) was attributed especially to the denitrification.
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Jedidi, N., Van Cleemput, O., M’Hiri, A. (1996). Effect of wetting and drying cycles on N mineralization/immobilization in soil amended with organic materials. In: Van Cleemput, O., Hofman, G., Vermoesen, A. (eds) Progress in Nitrogen Cycling Studies. Developments in Plant and Soil Sciences, vol 68. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5450-5_14
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DOI: https://doi.org/10.1007/978-94-011-5450-5_14
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