A simple model to predict N mineralisation of greenhouse soils
- Author
- Joost Salomez (UGent) , Karoline D'Haene, Georges Hofman (UGent) and I Vandevelde
- Organization
- Abstract
- The formulation of a correct N fertilisation advice, besides a measurement of N-min at the start of the growing period, mainly depends on the possibility to predict the N mineralisation out of soil organic matter. This study aimed to model the N mineralisation of greenhouse soils, using both easily available and easily measurable parameters. Two laboratory incubation experiments were set up. The first incubation experiment allowed to deduct a zero-order model, N-t = kt, in which N-t = N mineralised [kg N ha(-1)], k = N mineralisation rate constant [kg N ha(-1) day(-1)] and t = time [days], whereas the temperature dependence of the N mineralisation rate constant was deduced out of the second incubation experiment. The N mineralisation rate constant further depends on the N mineralisation potential of the soil and on the 'soil's age', i.e. being the time the soil has been glass-covered, eventually leading to the following simple N mineralisation model: N-t = (-9.965 + 0.104 N-KCl + 0.336 T + 0.095 O)t, with N-KCl = N-min in a hot KCl-extract (100degreesC) [kg N ha(-1)], T = temperature [degreesC] and O = soil's age [years]. Though the via the model calculated (k(mod)) and experimentally obtained (k(exp)) N mineralisation rate constants were closely related and a linear relationship was found k(mod) = 0.872 k(exp) (R-2 = 0.719, alpha<0.01), further research is necessary to evaluate this model in-situ. In the long run it will be incorporated into a nitrogen fertilisation advice system for greenhouse crops.
- Keywords
- SULFUR MINERALIZATION, NET NITROGEN, NITROGEN MINERALIZATION, rate constant, N mineralisation kinetics, soil organic matter, incubation experiments, TEMPERATURE, MOISTURE, CARBON
Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-152419
- Chicago
- Salomez, Joost, Karoline D’Haene, Georges Hofman, and I Vandevelde. 2002. “A Simple Model to Predict N Mineralisation of Greenhouse Soils.” In Acta Horticulturae, ed. R Booij and J Neeteson, 571:143–148. Leuven, Belgium: International Society for Horticultural Science (ISHS).
- APA
- Salomez, J., D’Haene, K., Hofman, G., & Vandevelde, I. (2002). A simple model to predict N mineralisation of greenhouse soils. In R. Booij & J. Neeteson (Eds.), Acta Horticulturae (Vol. 571, pp. 143–148). Presented at the Workshop on Towards an Ecologically Sound Fertilisation in Field Vegetable Production, Leuven, Belgium: International Society for Horticultural Science (ISHS).
- Vancouver
- 1.Salomez J, D’Haene K, Hofman G, Vandevelde I. A simple model to predict N mineralisation of greenhouse soils. In: Booij R, Neeteson J, editors. Acta Horticulturae. Leuven, Belgium: International Society for Horticultural Science (ISHS); 2002. p. 143–8.
- MLA
- Salomez, Joost, Karoline D’Haene, Georges Hofman, et al. “A Simple Model to Predict N Mineralisation of Greenhouse Soils.” Acta Horticulturae. Ed. R Booij & J Neeteson. Vol. 571. Leuven, Belgium: International Society for Horticultural Science (ISHS), 2002. 143–148. Print.
@inproceedings{152419, abstract = {The formulation of a correct N fertilisation advice, besides a measurement of N-min at the start of the growing period, mainly depends on the possibility to predict the N mineralisation out of soil organic matter. This study aimed to model the N mineralisation of greenhouse soils, using both easily available and easily measurable parameters. Two laboratory incubation experiments were set up. The first incubation experiment allowed to deduct a zero-order model, N-t = kt, in which N-t = N mineralised [kg N ha(-1)], k = N mineralisation rate constant [kg N ha(-1) day(-1)] and t = time [days], whereas the temperature dependence of the N mineralisation rate constant was deduced out of the second incubation experiment. The N mineralisation rate constant further depends on the N mineralisation potential of the soil and on the 'soil's age', i.e. being the time the soil has been glass-covered, eventually leading to the following simple N mineralisation model: N-t = (-9.965 + 0.104 N-KCl + 0.336 T + 0.095 O)t, with N-KCl = N-min in a hot KCl-extract (100degreesC) [kg N ha(-1)], T = temperature [degreesC] and O = soil's age [years]. Though the via the model calculated (k(mod)) and experimentally obtained (k(exp)) N mineralisation rate constants were closely related and a linear relationship was found k(mod) = 0.872 k(exp) (R-2 = 0.719, alpha{\textlangle}0.01), further research is necessary to evaluate this model in-situ. In the long run it will be incorporated into a nitrogen fertilisation advice system for greenhouse crops.}, author = {Salomez, Joost and D'Haene, Karoline and Hofman, Georges and Vandevelde, I}, booktitle = {Acta Horticulturae}, editor = {Booij, R and Neeteson, J}, isbn = {9789066058156}, issn = {0567-7572}, keyword = {SULFUR MINERALIZATION,NET NITROGEN,NITROGEN MINERALIZATION,rate constant,N mineralisation kinetics,soil organic matter,incubation experiments,TEMPERATURE,MOISTURE,CARBON}, language = {eng}, location = {Wageningen, The Netherlands}, pages = {143--148}, publisher = {International Society for Horticultural Science (ISHS)}, title = {A simple model to predict N mineralisation of greenhouse soils}, url = {http://www.actahort.org/books/571/571\_16.htm}, volume = {571}, year = {2002}, }