This is a link that has proved useful to me and others, so I'll pass it along again. Hope it helps some.

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Agoblue97 Reviewed by Agoblue97 on . A learning experience Yes I am a noob to this forum but not growing. I actually had something that has never happened. I am in the midst of losing a plant. I do not know whats wrong as of 2 weeks ago it was healthy and doing fine. I put into flower and today...it's probably not going to make it. I think Nute deficiency, specifically N. Soil Medium, proprietary blend. Unknow strain, has portrayed good characteristics in the past. Any Ideas. Low to No nutes as I prefer a more natual approach. Hence why I Rating: 5