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1. Askov Long-Term Experiments on Animal Manure and Mineral Fertilizers - Lermarken [Denmark.Askov]
The ASKOV Long-term Experiments on Animal manure and Mineral Fertilizers began in 1894. This area was first cultivated around 1800, and was previously open mixed heath and deciduous scrubland. The ...


2. Morrow Plots, Long Term Agriculutral Experiment, Illinois [UI.Morrow]
The exact origin of the Morrow plots on the campus of the University of Illinois is obscure, but they are reputed to be the oldest continuous agronomic research study in the USA. Some evidence indicates ...


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