Q.What Makes A Plant Start To Turn Yellow While Other Parts Are Still Green?
The veggies look like they’re growing good they just have certain sections that start to turn yellow.

Certified GKH Gardening Expert
There are many reasons a plant starts to turn yellow. If just the leaf edges are yellow, it could be a potassium deficiency. If the lower leaves are turning yellow, it could be they are getting shaded from the leaves above and that is not a problem. If you have specific plants you are concerned about, search our database for that vegetable's leaves turning yellow (www.gardeningknowhow.com).
Here is more on yellowing:
https://gardeningsolutions.ifas.ufl.edu/care/fertilizer/applying-fertilizer-to-vegetables.html