yellowing leaves getting worse

i have 6 plants 3 snowcap and 3 bubba kush. i applied a kelp extract to my plants a little over a week ago and am wondering if that isnt causing the foliage to turn yellow. i harvest the snow cap in a few days and my bubba kush plants about a week later. is this yellowing going to continue to spread? and if so should i flush them even when its so close to harvest?

How far along are your plants? If your into flowering then it wouold be normal for some yellowing to happen starting with the lower leaves. Any pics?