Tony Vyn, Purdue University (IMAGE)

Purdue University

Tony Vyn, Purdue University

Caption

Purdue agronomist Tony Vyn found that high yields were linked to corn's absorption of nutrients at specific ratios -- 5-to-1 for nitrogen to phosphorus and 1-to-1 for nitrogen to potassium.

Credit

Purdue University / Tom Campbell

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Please credit Purdue University / Tom Campbell.

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