A dynamic model for water and nitrogen limited growth in spring wheat to predict yield and quality

Matti Teittinen, Tuomo Karvonen, Jari Peltonen

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    Abstract

    Annual variation of bread wheat (Triticum aestivum L.) yield and quality has caused problems for agronomic policy in northern regions. Yield prediction methods based on visual assessment of crop may be inaccurate as they are not based on quantitative data. The aim of this study was to develop a simple dynamic model, based on daily climatological data, enabling prediction of crop growth, and changes in crop yield, and grain protein concentration and starch quality. The model was built using field data collected in 1972–88. Spring wheat cultivars included in the study were Kadett and Ruso. The calibration of growth and Hagberg falling number (used as a measure of starch quality) sub‐models resulted in a highly significant positive correlation between measured and calculated values. The calibration of nitrogen sub‐models failed, however, with poor correlation between measured and calculated values. The model was tested against independent field data collected during 1989–90, and results correlated with calibration results. The yield predictions based on independent field data were accurate, and the same as or similar to field trial results. However, the independent Hata revealed flaws in soil‐water and Hagberg falling number sub‐models. Copyright © 1994, Wiley Blackwell. All rights reserved
    Original languageEnglish
    Pages (from-to)90-103
    JournalJournal of Agronomy and Crop Science
    Volume172
    Issue number2
    Publication statusPublished - 1994
    MoE publication typeA1 Journal article-refereed

    Keywords

    • dyanmic model, grop growth, nitrogen uptake

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