The Tropical Fruit Forum

I have watermelon plants planted in 2 locations. One gets afternoon sun and the other gets morning sun till sunset. The one that gets sun all day have small small and pale green leaves. The one that gets afternoon sun has more lush growth, leaves are bigger and a lush green color. They both get the same amount of water and fertilizer. The only difference is the amount of sun they get. It seems like the one that gets only afternoon sun is growing better than the one that gets sun all day. Does anyone know why there's a difference in the size of the leaves? Thanks!