The purpose of this study is to evaluate different application timings of potassium and their impact on yield and profitability.

Sufficient soil test potassium (K) levels, like those present in this plot, do not always translate into sufficient K availability. Availability of K is highly dependent on soil moisture, which is why K deficiency is most common during extremely dry conditions. Early in the season, there was an excess of moisture followed by dry conditions after the middle of July. Unfortunately, this coincides with the timing of peak K demand. We speculate that there was inadequate rainfall to move the K into the root zone when surface-applied with the 360 Y-DROP® system, which leads us to question the efficacy of this application method for K.

 Fall: Disk-Rip, Spring: Field Cultivation | 

 Post: 1 qt. Atrazine, 3 oz. Capreno® | 

10 gal. 28-0-0 2x2, 5 gal. PureGrade® Diamond 6-24-6 In-Furrow | 

*®XL, Optimum, and AcreMax are registered trademarks of Pioneer. XL® brand seed is distributed by Beck’s Superior Hybrids, Inc.

Eezy™ K24, FurrowJet™ Wings, 360 Y-DROP®

2021 Iowa Corn Thin Stand Management Study - Fungicide Response

2021 Iowa Corn Sulfur Rate & Timing Study

Potassium Timing Study

2017 Indiana Corn Potassium Timing Study

Use whenever the name of a PFR Study mentions Starter Additive, Starter Fertilizer, Potassium, Silicon, Fertilizer, and/or Lime.