Phosphorus deficiencyRecently on some leaves brown spots have started coming.
What are these and how do I sort it?
Thanks
Wrong. Calcium deficiency shows on newest growth. And phosphorus is one of the 3 main nutrients needed from the start. Nothing says magnesium deficiency at all. But whatever.I'd say cal/mag deficiency. How much phosphorus do seedlings need? May need some nitrogen, but not much. Alfalfa meal top dressing and worm tea should fix the problem.