agger802 - 12/8/2011 10:51 Just pulled the tissue analysis I took back in 2008 from MU. I took samples from severely affected plants, moderaley affected, and healthy plants. From my picture I posted of the field you can see the variance. In the severely affected plants: 481 ppm of Fe (normal is 10-200 ppm) 12 ppm of Zn (normal is 15-60 ppm) phosphorus was on the line for low and optimum range actually. Wasn't as low as I thought. As the plants got heathier, that analyses showed less Fe and more Zn within the tissue test. Boron and Mn were optimum in all stages and analyses. I agree that the leaf lesions are a little different that "typical" zinc defiency symptoms that I typically see too. However the shortened internodes are classic zinc symptomology. Diagnosis form the lab was zinc deficiency and iron toxicity. Here's another picture that looks a little more like typical zinc issues. Yes, the plants in this photo look a bit more characteristic of Zn def. Yes, 12 ppm Zn would be catastrophically low in the plant. I don't think 480 ppm Fe in the tissue is meaningful. I.e., it's not the problem. Shortened internodes would also be a symptom of P def. And several micros. I don't give too much deference to what the lab cranks out for 'interpretation' -- i.e., what they say is deficient, low, medium, high, toxic. Some of those values haven't been updated in 40 years and are way off the mark. respectfully, | 
what problems can high Fe levels in the soil create?
