The sweet corn in the photo is yellow due to a lack of nitrogen fertilizer. Applying nitrogen will help correct that problem.
One-tenth of a pound of nitrogen does not mean one-tenth of a pound of fertilizer. No fertilizer is 100% nitrogen. Fertilizers, whether synthetically manufactured or organic, contain varying levels of nitrogen. If you use ammonium sulfate as your nitrogen source, it contains ~20% N. Therefore 5 pounds of ammonium sulfate equals 1 pound of nitrogen. If you use Corn Gluten (~10% N) as your nitrogen source it will take 10 pounds of corn gluten for every pound of Nitrogen.