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Iowa State University

Soybean

Plant Sciences

Graduate Theses and Dissertations

2008

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Soil And Fertilizer Potassium Impacts On Corn And Soybean Grain Yield, Potassium Uptake, And Within-Field Grain Yield Variation, Matthew William Clover Jan 2008

Soil And Fertilizer Potassium Impacts On Corn And Soybean Grain Yield, Potassium Uptake, And Within-Field Grain Yield Variation, Matthew William Clover

Graduate Theses and Dissertations

Two studies were conducted in Iowa to better understand how potassium (K) fertilization affects grain yield, vegetative growth, and K concentration of different parts of modern corn (Zea mays L.) hybrids and soybean (Glycine max L. Merr.) varieties. One study was based on one- to three-year strip-trials (63 site-years) conducted from 2001 to 2007 to evaluate the effects of K fertilization on corn and soybean grain yield and post-harvest soil-test K (STK) measured with the ammonium acetate extractant. Replicated treatments were 0 and 168 kg K ha-1. Potassium increased yield as evaluated by strip averages in 21 of 63 ...