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Interaction Among Atrazine, Temperature, and Phosphorus-Induced Zinc Deficiency in Corn (Zea mays L.)¹

ABSTRACT

Corn (Zea mays L.) was grown with two levels each of P and Zn with and without atrazine in the field on recently leveled P- and Zn-deficient soil and in nutrient solutions in environmental chambers. Severe Zn deficiency symptoms were exhibited by field-grown corn receiving no Zn and were accentuated by P fertilization. Atrazine had no evident effect on deficiency development. Phosphorus and Zn concentrations in leaves, but not in grain, of field-grown corn were increased by atrazine. In environmental chambers, corn seedling growth was decreased more by atrazine toxicity than by P or Zn nutrition. Phosphorus and Zn concentrations were increased frequently by atrazine at low but not at high growing temperatures. Atrazine had little apparent effect on P-induced Zn deficiency development in the field or in environmental chambers.

¹ Contribution no. 1104, Department of Agronomy, Kansas Agr. Exp. Sta.

² Graduate Research Assistants, Associate Professor, and Professor, respectively, Department of Agronomy, Kansas State University, Manhattan, Kans.

Received for publication August 25, 1969. Accepted for publication November 4, 1969.