MustangStudFarm
Well-Known Member
I started to develop a problem and I couldn't figure it out and I misdiagnosed it for about a week now. I've been dealing with micronutirient deficiencies and it looked very similar to an iron deficiency. Thankfully, I came across a website that clarified it for me and the hammer really hit the nail when I read it. I thought "maybe I have iron deficiency and over-fertilization causing curl".
Potassium deficiencies often resemble iron deficiencies. The tell-tale way of knowing that a potassium deficiency is a problem is by the curling leaves, the burnt edges, and leaf death.
http://www.ilovegrowingmarijuana.com/marijuana-nutrient-deficiency-potassium/
Anyways, this article is spot on for my problem and I am 90% sure about it. It's another day at the "School of hard knocks" over here. I thought that I would share my problem. I top-dressed with a little oyster shell flour the other week and I think that it set this deficiency in high gear. I had my soil tested before I planted in it and I knew what was going on, because my soil test is supposed to be 2x the desired value for K. From what I understand, potassium is the only one the needs to be adjusted for cannabis and everything else needs to be at the normal levels.
Look at the section called Base Saturation, I could use less Mg and more K. The K needs to be 2x the amount that they suggest and I really didn't do anything to fix it and I didn't start showing a def until week #5.
They just look thirsty. Potassium helps with water retention.
Potassium deficiencies often resemble iron deficiencies. The tell-tale way of knowing that a potassium deficiency is a problem is by the curling leaves, the burnt edges, and leaf death.
http://www.ilovegrowingmarijuana.com/marijuana-nutrient-deficiency-potassium/
Anyways, this article is spot on for my problem and I am 90% sure about it. It's another day at the "School of hard knocks" over here. I thought that I would share my problem. I top-dressed with a little oyster shell flour the other week and I think that it set this deficiency in high gear. I had my soil tested before I planted in it and I knew what was going on, because my soil test is supposed to be 2x the desired value for K. From what I understand, potassium is the only one the needs to be adjusted for cannabis and everything else needs to be at the normal levels.
Look at the section called Base Saturation, I could use less Mg and more K. The K needs to be 2x the amount that they suggest and I really didn't do anything to fix it and I didn't start showing a def until week #5.
They just look thirsty. Potassium helps with water retention.
