PROOF OF THE ESSENTIAL NATURE OF COPPER FOR HIGHER GREEN PLANTS

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Abstract
Confirming an unpublished earlier experiment with flax which seemed to prove that Cu is essential to that plant, a more elaborate experiment was carried out, in which barley was grown in solutions of specially purified salts and purified distilled water in a special greenhouse compartment. Ten control cultures (no Cu), 5 cultures receiving 1/16 part per million of Cu, and 5 receiving 1/8 p.p.m., were grown. The plants in the control cultures produced no seeds; those receiving Cu produced fertile heads with viable seeds.

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