Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the IIIrd International Symposium on Models for Plant Grwoth, Environmental Control and Farm Management in Protected Cultivation (Hortimodel2006) |
| Publisher | International Society for Horticultural Science |
| Pages | 157-164 |
| Number of pages | 8 |
| ISBN (print) | 9066056096, 9789066056091 |
| Publication status | Published - Oct 2006 |
Publication series
| Name | Acta Horticulturae |
|---|---|
| Volume | 718 |
| ISSN (Print) | 0567-7572 |
Abstract
NICOLET is a single organ, three-state-variable vegetative model, originally developed for lettuce, with focus on the compositional relationships among water, carbon and nitrogen, in their various forms (soluble, structural, organic, etc.). It recognizes the decrease with age of organic N content, dry matter content, and specific leaf area. At the same time, plant nitrate concentration responds to changes in the environment, particularly in the nutrient solution. In this study, the NICOLET model is fitted to data from a two-year N-nutrition experiment with cauliflower. Compared to previous calibration attempts, the new data are for a crop different than lettuce and include leaf area measurements. Since the model has many parameters (twenty-four in this version), a balanced treatment of all of them may end up in one of many local extrema. Therefore, a first-order calibration, in stages guided by the structure of the model, is used, fitting only a few parameters at a time. This approach results in good fits, for both years with the same set of parameters, of total dry matter, dry matter content, reduced-N content and specific leaf area. However, a good prediction of nitrate concentration requires a different parameter set for each year.
Keywords
- Crop growth, Crop models, Crop nitrate, N nutrition, Parameter estimation
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Horticulture
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
Proceedings of the IIIrd International Symposium on Models for Plant Grwoth, Environmental Control and Farm Management in Protected Cultivation (Hortimodel2006). International Society for Horticultural Science, 2006. p. 157-164 (Acta Horticulturae; Vol. 718).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Model guided calibration
T2 - Nitrogen in cauliflower
AU - Seginer, Ido
AU - Stützel, Hartmut
PY - 2006/10
Y1 - 2006/10
N2 - NICOLET is a single organ, three-state-variable vegetative model, originally developed for lettuce, with focus on the compositional relationships among water, carbon and nitrogen, in their various forms (soluble, structural, organic, etc.). It recognizes the decrease with age of organic N content, dry matter content, and specific leaf area. At the same time, plant nitrate concentration responds to changes in the environment, particularly in the nutrient solution. In this study, the NICOLET model is fitted to data from a two-year N-nutrition experiment with cauliflower. Compared to previous calibration attempts, the new data are for a crop different than lettuce and include leaf area measurements. Since the model has many parameters (twenty-four in this version), a balanced treatment of all of them may end up in one of many local extrema. Therefore, a first-order calibration, in stages guided by the structure of the model, is used, fitting only a few parameters at a time. This approach results in good fits, for both years with the same set of parameters, of total dry matter, dry matter content, reduced-N content and specific leaf area. However, a good prediction of nitrate concentration requires a different parameter set for each year.
AB - NICOLET is a single organ, three-state-variable vegetative model, originally developed for lettuce, with focus on the compositional relationships among water, carbon and nitrogen, in their various forms (soluble, structural, organic, etc.). It recognizes the decrease with age of organic N content, dry matter content, and specific leaf area. At the same time, plant nitrate concentration responds to changes in the environment, particularly in the nutrient solution. In this study, the NICOLET model is fitted to data from a two-year N-nutrition experiment with cauliflower. Compared to previous calibration attempts, the new data are for a crop different than lettuce and include leaf area measurements. Since the model has many parameters (twenty-four in this version), a balanced treatment of all of them may end up in one of many local extrema. Therefore, a first-order calibration, in stages guided by the structure of the model, is used, fitting only a few parameters at a time. This approach results in good fits, for both years with the same set of parameters, of total dry matter, dry matter content, reduced-N content and specific leaf area. However, a good prediction of nitrate concentration requires a different parameter set for each year.
KW - Crop growth
KW - Crop models
KW - Crop nitrate
KW - N nutrition
KW - Parameter estimation
UR - http://www.scopus.com/inward/record.url?scp=37849187387&partnerID=8YFLogxK
U2 - 10.17660/ActaHortic.2006.718.17
DO - 10.17660/ActaHortic.2006.718.17
M3 - Conference contribution
AN - SCOPUS:37849187387
SN - 9066056096
SN - 9789066056091
T3 - Acta Horticulturae
SP - 157
EP - 164
BT - Proceedings of the IIIrd International Symposium on Models for Plant Grwoth, Environmental Control and Farm Management in Protected Cultivation (Hortimodel2006)
PB - International Society for Horticultural Science
ER -