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Nutrition of Corn (Zea mays L.) on a Calcareous Soil: III. Interaction of Zinc and Boron with Plant Population and the Relationship between Grain Yield and Leaf Composition¹

ABSTRACT

A field experiment on corn with N, Zn, Mn, B and plant population as variables resulted in important positive interactions of plant population with applied Zn and with applied B indicating that limited Zn or B may be part of the reason for the severe yield decrease resulting from planting corn too thickly. High rates of applied Zn or B (90–180 kg/ha) were depressing to grain yield at low plant populations (40,000–53,333 plants/ha) but increased yields at high plant populations (80,000–93,333 plants/ha).

The logarithm of the nitrate-N concentration of the midrib of the sixth corn leaf at the silking stage was found to be closely correlated with grain yield up to about 1,000 ppm. The relationship between the total N concentration of the leaf blades and grain yield was less distinct. The phosphate-P concentration of the midrib and the total P concentration of the leaf blades were significantly increased by increasing applications of N. The B concentration of midribs at the point of maximum yield varied from < 60 ppm at low plant population to 120 ppm at high plant population.

¹ Authorized for publication on Sept. 10, 1964 as Journal no. 123 by the Faculty of Agricultural Sciences of the American University of Beirut, Lebanon.

² Associate Professor of Soils.

Received for publication December 16, 1965. Accepted for publication January 25, 1966.