Boron deficiency results in 'hollow heart' in many crops, a state occurring more and more often in organic produce in NZ. Glen That's interesting. I wonder why? According to my book on plant nutrition B deficiency can occur: on very light soils water logged soils high pH soils, after liming in form of B-Ca-Al silicate precipitation drought Might any one of these reasons apply? If the soils are actually deficient, what would be the solution? Add boron rich rock dust (mica rich rock dust) and then grow green manures that are deep rooted and use a lot (brassicas, rye corn, alfalfa) to keep th B in the top soil, add dandelion to the compost? Christiane
