My young lemon tree has yellow blotches on some of its leaves, even though the leaves are quite newly grown. This advice suggests that it's likely to be deficient in Manganese, rather than Magnesium, as the older leaves look ok.
Whenever possible, I use organic methods in the garden, so I would really appreciate advice consistent with organic gardening principles. How likely is it that some regular (home made) garden compost could help resolve this? Is there a mulch of some particular plant high in Manganese that I could apply?
Any other suggestions would be appreciated too