I do not know if I can help but I will try. Firstly, you do not want wood chips in your soil. It fosters insects, fungus and bacteria amongst other issues. Secondly, you have not provided any info about watering habits, PH or nutrients. My best guess at this time is that you have overwatered your plants and the PH is way out of adjustment causing nutrient lockout. If you provide more detailed information, I am sure that someone can be more specific and salvage your grow, but you need to act fast.