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Effect of Soil Potassium, Potassium Fertilizer, and Method of Placement Upon Lodging in Corn (Zea mays L.)¹

ABSTRACT

A quadratic regression equation including selected linear interactions was fitted to lodging percentages of corn grown on a Hartsells loam with varying K soil test levels and K fertilizer rates applied in the row and broadcast. The study was conducted over a 3-year period and main effect variables for year, soil test K, and fertilizer K, as well as selected linear interactions, were included in a regression analysis. Both soil and fertilizer K significantly decreased percent lodging, and there was a significant difference in lodging among years. The significant soil K and fertilizer K interaction indicated that the effect of fertilizer K upon lodging varied with soil-test level. There was also a significant interaction of fertilizer K with year indicating that the effect of K upon lodging varied among years.

¹ Contribution from the Department of Agronomy, University of Tennessee, Knoxville.

² Associate Professor of Agronomy, University of Illinois at Urbana-Champaign formerly Assistant Extension Agronomist, University of Tennessee, and Professor of Agronomy, University of Tennessee, respectively.

Received for publication April 15, 1969. Accepted for publication August 5, 1969.