A DYNAMIC-MODEL FOR WATER AND NITROGEN LIMITED GROWTH IN SPRING WHEATTO PREDICT YIELD AND QUALITY

Citation
M. Teittinen et al., A DYNAMIC-MODEL FOR WATER AND NITROGEN LIMITED GROWTH IN SPRING WHEATTO PREDICT YIELD AND QUALITY, Journal of agronomy and crop science, 172(2), 1994, pp. 90-103
Citations number
27
Categorie Soggetti
Agriculture
Journal title
Journal of agronomy and crop science
ISSN journal
09312250 → ACNP
Volume
172
Issue
2
Year of publication
1994
Pages
90 - 103
Database
ISI
SICI code
0931-2250(1994)172:2<90:ADFWAN>2.0.ZU;2-1
Abstract
Annual variation of bread wheat (Triticum aestivum L.) yield and quali ty has caused problems for agronomic policy in northern regions. Yield prediction methods based on visual assessment of crop may be inaccura te as they are not based on quantitative data. The aim of this study w as to develop a simple dynamic model, based on daily climatological da ta, enabling prediction of crop growth, and changes in crop yield, and grain protein concentration and starch quality. The model was built u sing field data collected in 1972-88. Spring wheat cultivars included in the study were Kadett and Ruso. The calibration of growth and Hagbe rg falling number (used as a measure of starch quality) sub-models res ulted in a highly significant positive correlation between measured an d calculated values. The calibration of nitrogen sub-models failed, ho wever, with poor correlation between measured and calculated values. T he model was tested against independent field data collected during 19 89-90, and results correlated with calibration results. The yield pred ictions based on independent field data were accurate, and the same as or similar to field trial results. However, the independent data reve aled flaws in soil-water and Hagberg falling number sub-models.