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Nitrogen Fertility Gradient
The nitrogen study is a long-term study located at the LTER Main Site complex, in which a continuous corn cropping system is fertilized at 9 different nitrogen levels in order to show the extent to which nitrogen limits plant productivity in any given field season. Nitrogen applications range from 0 to 291 kg N / ha . Plots are 5 x 30 m arranged in each of 4 replicate blocks. This experiment was established in 2000. In 2003 an irrigation treatment was added. Click on the image for a printable map of the study area.