Summary
Quantitative methods were developed for predicting and controlling concentrations of nutrients in grain and straw of oats and spring wheat based on a given or a predicted chemical composition of the young plant at a fixed Dry Matter weight level.
Models of prognosis and therapy were based on relationships between grain yield and concentrations of various nutrients in grain and straw and on relationships between concentrations of the nutrients. These relationships were derived from selected data referring to ‘pure’-effect concentrations of various nutrients at a 1 g DM weight-level and obtained from pot experiments. Such relationships between grain yield and ‘pure’-effect concentrations were non-ambiguous and clear due to the elimination of the Steenbjerg-effect.
The methods, tested by comparing predicted with experimentally obtained concentrations of nutrients in grain and straw, proved reliable for N, Ca and Na in grain and for N, P, K, Mg, Ca and Na in straw by fairly high and highly significant correlation coefficients (r=0.7−0.9 andp<0.001).
The methods of therapy are closely related to previously developed methods of diagnosis of the nutritional status of the young plant and of prognosis and control of quantity of yield.
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References
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Nielsen, J.M. Evaluation and control of the nutritional status of cereals. Plant Soil 52, 245–268 (1979). https://doi.org/10.1007/BF02184564
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DOI: https://doi.org/10.1007/BF02184564