Summary
Methods of diagnosis, yield prognosis and therapy, main part of a fertilization system for spring sown cereals, based on results from pot experiments were successfully transferred to results from field experiments in Scandinavia under widely varying conditions.
At the selected DMw-level of 0.2 g per plant the optimal chemical composition of the young plant associated with highest obtained yields was: 5.0% N, 0.55% P, 5.2% K, 0.10% Na, 5.3% (K+½ Na), 0.15% Mg, 1.0% Ca, 60 ppm Mn and 8 ppm Cu.
The optimal chemical composition was independent of species and variety, soil type and region, allowing the methods to be based on solely one set of models.
The selected DMw-level-model niveau or standard dry weight-was low compared with that for pot cultures making early diagnosis and therapy possible under field conditions.
A correction model was developed in order to estimate the chemical composition of the plant at model niveau from the chemical composition of the plant sampled at any time during early growth and with the view to apply the fertilization system to agricultural practice.
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References
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Note: As the present paper solely deals with the transfer of a particular fertilization system from pot to field conditions, the references are restricted to the previous papers in this series.
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Nielsen, J.M. Evaluation and control of the nutritional status of cereals. Plant Soil 64, 403–423 (1982). https://doi.org/10.1007/BF02372523
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DOI: https://doi.org/10.1007/BF02372523