Minor element studies with soybeans. I. Varietal reaction to concentrations of zinc in excess of the nutritional requirement
1943
Earley, E.B.
The deleterious substance responsible for the death of the soybean plants attempted to be grown in the greenhouse during the fall of 1937 and spring of 1938 was zinc which had dissolved from the nutrient solution pump. There exists a distinct varietal variation among soybeans in reaction to approximately 0.3 p.p.m. (2.3 mgms per plant) of zinc in a slightly acid nutrient solution when plants are grown in crushed quartz. Hudson Manchu will successfully tolerate 8 andperhaps 12 times the external concentration of zinc as will Peking. The mechanism of varietal reactions of soybeans to zinc was not determined, although differential absorption and tolerance are discussed in this connection. The reaction of soybean varieties to zinc showed no correlation to percentage of oil or protein of the seed. Likewise, there appeared to be no consistant relationship between color of seed and plant reaction to zinc. Among the varieties studied, with the exception of Biloxi and Virginia, early maturity and resistance and late maturity and susceptibility appear to be associated. Also, with regard to size of seed and varietal reaction to zinc, it may be stated that the most resistant varieties were the largest seeded ones, while the most susceptible varieties were the smallest seeded ones.
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