Beginner Gardening: What is wrong with the lower leaves on this GAC Plant?, 1 by mocjack

mocjack wrote:
What do you think is wrong with the lower leaves on this GAC http://davesgarden.com/guides/pf/go/174939/ plant?

They are turning an almost orange color. It looks a little more yellow in the picture than it is. The upper part of the vine seems just fine. The plant is only about 9 weeks old and is in a 8-gallon pot until spring when I can take it outside. It just appears like these lower leaves are doing this.

If it is insufficient fertilizer, can you recommend what I might use? I bought some of the "neptune's harvest" product but have not tried it yet.

-Jack