Die Anwendung der Ertragskurvenberechnung nach von Boguslawski und Schneider bei der Auswertung aktueller N-Steigerungsversuchsserien |
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| Authors: | Johannes Heyn Dr |
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| Institution: | 1. Hessisches Dienstleistungszentrum für Landwirtschaft, Gartenbau und Naturschutz , Fachgebiet 43, Am Versuchsfeld 13, D-34128, Kassel johannes.heynt-online.de |
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| Abstract: | Abstract Yield curve calculation according to von BOGUSLAWSKI and SCHNEIDER as well as the EDP calculating programme, derived from it by Horst and Heyn (1988 Horst H Heyn J 1988 Ein PC-Programm zur Errechnung von Ertragskurven nach der dritten Annäherung an das Ertragsgesetz von v. Boguslawski und Schneider LUFA Kassel, hausintern Google Scholar]) and later also Kowert (2001 Kowert A 2001 Erstellung eines PC-Programmes zur Ermittlung von Ertragskurven bei Düngungsversuchen Diplomarbeit FH Osnabrück, FB Agrarwissenschaften, Studiengang Landwirtschaft Google Scholar]), are described. With the version at hand objective and reproducible results can be calculated in a fast and user-friendly way. This program enables an exact definition of the maximum yield and the best fertilisation required; also every yield value on the basis of a given amount of nutriment can be deduced. Thereby results of tests and series with differing variations can be offset against each other together. Like this wide research series with accordingly high significance can be evaluated. Of course other parameters can be calculated in addition to the yield, too. This yield curve calculation is particularly suitable for the evaluation of research on N-increase. Considering Hessian research on winter wheat, winter barley, winter rye, rape seed and sugar beet as example, the effects of increasing mineral N-fertilisation on the yield, the adapted financial gross earning and the N-removal with the main product of a crop are indicated. The N-fertilisation aiming at the greatest natural yield of the tested fruit winter wheat, winter barley, winter rye, rape seed and sugar beet, requires an amount of about 145 to 225 kg N/ha. The economical optimisation of the N fertilisation is about 30 to 40 kg/ha lower with cereals compared to about 90 kg/ha lower with rape and sugar beet. The optimisation of the N-fertilisation as to the financial gross earning leads to a significant increase of the supply-removal-account into an uncritical range for all fruits. The amount of the N-fertilisation should not be fixed on the natural yield, but on parameters of cost-effectiveness. This leads to economical and ecological advantages. |
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| Keywords: | yield curve N-fertilization trial series rentability N-removal crops |
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