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How much fertilizer is too much for Earth's climate?
![tractor in a corn field at the NSF Kellogg Biological Station LTER site.](/news/mmg/media/images/corn.fertilizing.KBS.LTER.0001_f.jpg)
Applying nitrogen fertilizer to corn at the NSF Kellogg Biological Station LTER site.
Credit: J.E. Doll, MSU
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![A Michigan corn field east of the Kellogg Biological Station LTER site.](/news/mmg/media/images/corn.farmscape.KBS.LTER.0001_f.jpg)
A Michigan corn field east of the Kellogg Biological Station LTER site.
Credit: J.E.Doll, MSU
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![View of a Kellogg Biological Station LTER experiment to test how crops respond to nitrogen.](/news/mmg/media/images/nutrient.gradient.KBS.LTER.0001_f.jpg)
View of a Kellogg Biological Station LTER experiment to test how crops respond to nitrogen.
Credit: K. Stepnitz, MSU
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![corn in mid-August at the Kellogg Biological Station LTER site.](/news/mmg/media/images/corn.KBS.LTER.0006_f.jpg)
Good crop: Corn in mid-August at the Kellogg Biological Station LTER site.
Credit: J.E.Doll, MSU
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![Researcher AJ Ozanich collects greenhouse gas samples in a Kellogg Biological Station corn field.](/news/mmg/media/images/greenhouse.gas.sampling.KBS.LTER.0002_f.jpg)
Researcher AJ Ozanich collects greenhouse gas samples in a Kellogg Biological Station corn field.
Credit: K. Stepnitz, MSU
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![LTER scientist Kevin Kahmark next to equipment analyzing samples in the lab.](/news/mmg/media/images/greenhouse.gas.labwork.KBS.LTER.0001_f.jpg)
LTER scientist Kevin Kahmark analyzes greenhouse gas samples in the lab.
Credit: K. Stepnitz, MSU
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