Q.Why Are My Corn And Bean Plants Yellowing?
They are just seedlings right now but the leaves on them are still turning yellow. We have added extra nitrogen to the soil per Google, that was their recommendation.

Certified GKH Gardening Expert
Unfortunately, your photo did not come through. There are several reasons for yellowing, from pH imbalances to over and underwatering. Make sure to test the nutrient content of the soil and the pH, prior to feeding. These articles will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
The seedlings will appreciate a dry out down to about 1 or 2 inches between waterings. A moisture meter may be necessary:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm