Relative Effects of Zinc and Copper Deficiencies on Lucerne and Subterranean Clover

Abstract

The symptoms of zinc deficiency in subterranean clover (var. Dwalganup) and lucerne (var. Hunter River) are described. Bronze spotting was caused by the localized collapse of cells of the upper epidermis. Spherical coacervates which occurred in the underlying cells were different in appearance in the two species. Microchemical tests indicated the presence of phosphorus compounds in the membrane enveloping the coacervates of subterranean clover. The "little leaves" were variable in thickness owing to hypertrophy of the palisade cells. Reduced light delayed the date of appearance of these symptoms.