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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. Deherain Plots, Long Term Cropping/Soil Experiment, France [INRA.Deherain]
The Deherain long-term field experiment was started in 1875 to study the impact of fertilization on crop yield. Before 1875, the soil was cultivated with alfalfa without fertilization. Between 1929 ...

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