The Internet's Finest Tropical Fruit Discussion Forum!"All discussion content within the forum reflects the views of the individual participants and does not necessarily represent the views held by the Tropical Fruit Forum as an organization."
OK. Maybe I'll send off a handful of leaves for a tissue analysis. Spectrum does it for a reasonable price.
Quote from: Cookie Monster on May 31, 2016, 08:08:12 PMOK. Maybe I'll send off a handful of leaves for a tissue analysis. Spectrum does it for a reasonable price. Got a link?Doesn't look like a Ca deficiency to me either. Have seen that symptom in citrus and believe it's a Mg deficiency. Whatever, epsom salts helped.
The middle of the leaf looks like Manganese deficiency, but I do not recognize the wide dark green outer margin.Maybe deficiency of Boron or Zinc can cause indirect Calcium deficiency?
Excess K causes Ca, Mg and Bo to be difficult to uptake as these are antagonistic nutrients. I think it causes alkalinity so a second raft of nutrient may so harder to absorb, Sulphur to correct would make the Ca and Mg uptake worse and even cause Mo deficiency and so there is a cycle. the leaf could be Mg deficient with other things going on. Lots of mulch might help.