Hans-Jürgen Reents

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Differences among six winter wheat varieties regarding N efficiency (NE) and its components were assessed in field trials in four locations over 3 years under conditions of organic farming (OF). N uptake and utilization efficiency, redistribution of N vs. direct N uptake during grain filling, N uptake in three periods (tillering, stem elongation/heading and(More)
For organic potato producers, the two main challenges are disease and nutrient management. Both are limited by regulations that on the one hand prohibit the use of chemical fertilizers, especially nitrogen, and on the other hand prohibit most synthetic pesticides. Late blight caused by Phytophthora infestans is commonly thought to be the most yield-reducing(More)
In order to optimize potato crop management in organic farming systems, knowledge of crop growth processes in relation to limitations and reductions by nitrogen (N) and disease is necessary. This paper examines the effect of different prevention measures (seed tuber pre-sprouting, choice of cultivars: resistance to Phytophthora infestans; earliness of tuber(More)
Genetic resistance is the most effective, economical and environment friendly method of managing tan spot of wheat caused by the ascomycete Pyrenophora tritici-repentis (Died.) Drechs. (anamorph Drechslera tritici-repentis, Died.). This study was carried out to determine the association between seedling and adult plant resistance in winter wheat cultivars,(More)
Durch die Einführung von Cross Compliance werden Verstöße gegen Umweltstandards sanktioniert. Um den Landwirt bei der Kontrolle über die Einhaltung der CC Kriterien zu unterstützen, wird in das Umweltund Betriebsmanagementsystem REPRO eine Checkliste integriert. Durch die Erfassung des kompletten landwirtschaftlichen Betriebssystems in REPRO sind viele(More)
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