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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation and control of the nutritional status of cereals (1979)
    Springer
    Plant and soil 52 (1979), S. 229-244 
    Details
    ISSN: 1573-5036
    Keywords: Chemical composition ; Diagnosis ; Grain ; Nutritional status ; Oats ; Prognosis ; ‘Pure’-effect ; Quantity ; Spring wheat ; Steenbjerg-effect ; Straw ; Therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A quantitative therapy method was developed for predicting and controlling grain yields of oats and spring wheat based on methods of diagnosis and yield pronosis and on effects of supplementary applications of nutrients on the chemical composition of the young plant at a fixed Dry Matter weight-level. The characteristic interactions integrated in the models of therapy and depending on kind, source, amount and combination of the nutrient applications on the chemical composition of the young plant allow selection of the best possible nutrient therapy under the given circumstances. The therapy method, tested by comparing predicted with experimentally obtained nutrient concentrations in the young plant, was proved reliable by the high and highly significant correlation coefficients (r〉0.9;p〈0.001). The correctness of the basic concepts underlying the therapy method, was thus indirectly confirmed and the possibility to use the method in agricultural practice would appear promising.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184563
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation and control of the nutritional status of cereals (1982)
    Springer
    Plant and soil 64 (1982), S. 403-423 
    Details
    ISSN: 1573-5036
    Keywords: Chemical composition ; Correction model ; Diagnosis ; DMw.-level ; Fertilization system ; Field Conditions ; Prognosis ; Pure-effect ; Spring-sown cereals ; Therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372523
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation and control of the nutritional status of cereals (1980)
    Springer
    Plant and soil 55 (1980), S. 465-483 
    Details
    ISSN: 1573-5036
    Keywords: Chemical composition ; Diagnosis ; Grain ; Nutritional status ; Oats ; Prognosis ; Pureeffect ; Spring wheat ; Steenbjerg-effect ; Straw ; Therapy ; Trophogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Based on grain yield and the chemical composition of grain and straw at maturity, a quantitative method of estimating the nutritional status of the young plant and the corresponding nutritional conditions of the growth medium was developed from results of three years' of factorial fertilizer pot experiments with oats and spring wheat. In trophogenetic methods, yield and chemical composition of older plants form the basis for the conclusion on soil fertility at sowing time with the aim to decide on future fertilizer policy. Contrary to earlier trophogenetic methods, the present method includes the nutritional status of the young plant—based on a well-defined stage of development (DMw-level) and pure-effect concentrations of nutrients—as an intermediate link in the above conclusion. The method follows the reversed direction of procedures based on the models used for diagnosis and prognosis of grain yield and chemical composition of plant parts at maturity previously outlined. The reliability of the method was proved by comparing trophogenetically determined and experimentally obtained nutrient concentrations in the young plant. The coefficients of regression and correlation were both close to 1, and the latter was highly significant. Together with the methods of diagnosis, prognosis and therapy, trophogenesis completes the framework enclosing all possibilities of using the plant analysis in evaluation and control of the nutritional status of the plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182706
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Evaluation and control of the nutritional status of cereals (1979)
    Springer
    Plant and soil 52 (1979), S. 245-268 
    Details
    ISSN: 1573-5036
    Keywords: Chemical composition ; Diagnosis ; Grain ; Nutritional status ; Oats ; Prognosis ; ‘Pure’-effect ; Quality ; Spring wheat ; Steenbjerg-effect ; Straw ; Therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184564
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    Paper (German National Licenses)
    Fulltext
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