Leaf - Injection
But the experiment in leaf-injection seem to me among the most interesting things going on at East Mailing now. " By injecting minerals one or more at a time . . . into a selected part of a plant as small as a single intravenal area or as large as a main branch or whole tree . . mineral deficiencies can be diagnosed extremely rapidly." For example, a Kentish cherry-orchard (cherry land is of very high value) had been a problem for years. A clear line of demo/. cation went through it, showing healthy trees in full bearing on one side, sickly and non-bearing trees on the other. Leaf-injection analyses showed what had never been shown before—a deficiency of manganese in the sickly trees. Injection of manganese revealed encouraging results, the trees putting out dark, healthy growth, and later injections on a curative scale have solved the problem of that orchard for many years. There must be scores of similar cases waiting to be tackled and solved. I ought to say, perhaps, that leaf-injection is not an amateur's business, and that injecting your decaying apple trees with a hypodermic syringe filled from the children's chemistry set will not yield the correct results. If you have a problem in chlorosis send it to 'the research-station.
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