With the "eternal rye" experiment, laid out by Julius Kuhn in 1878,
the Institute of Agricultural and Nutritional Sciences of the
Martin Luther University Halle-Wittenberg has the second oldest
long-term fertilization trial of the world after Rothamstedt (UK).
In addition, four more long-term fertilization experiments as well
as one soil development trial exist in Halle, all founded by Karl
Schmalfuss in 1948/49. Wolfgang Merbach and Annette Deubel
summarize the most important results and draw conclusions for the
continuation of these internationally important experiments.
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