I recently planted corn in my garden and I'm noticing that their leaves are a yellow-green. I did add a nitrogen fertilizer and it seemed to help a bit. However, when driving by farms I notice that the corn leaves in a farmer's field are a deep green. Are my leaves too yellow? (Picture below)
You've planted around 20 corn plants or more in 16 square feet? You need to thin your corn plants to a more reasonable number. Have you fertilized? Your corn leaves are way too yellow.
Get some basic balanced fertilizer; Osmocote 14-14-14 extended release. Easy, safe and really saves time. A balanced fertilizer with the three main ingredients have a percentage number each. Corn? If you've given it an application of high percentage formulation of nitrogen then now you have to use NPK formulation where the N is a lower percentage of P and K! If you want corn instead of leaves.
Pull all but 6 or 8 corn plants. What are you using and what have you used to give your plants the proper chemicals to do photosynthesis? Have to have fertilizer! Not compost but fertilizer. btw what soil did you put in your raised beds?