The purpose of this study is to test the effectiveness of starter products at different planting dates.

2017 Kentucky Soybean Starter Fertilizer Study - Timing

In theory, starter fertilizers are most likely to be beneficial early in the season, when cold, wet soil conditions limit mineralization and ultimately, nutrient availability. While temperatures were not cold with the May 11 planting date, they were relatively cooler when compared to the later planting date of June 1. Additionally, the frequent, heavy rains early in the season resulted in anaerobic soil conditions during early soybean development of the May 11 planting date. Additionally, a large response was observed with XL® 493R4™*brand, the slower emerging variety tested.

 Post: 1.5 pt. Flexstar®, 0.3 oz. FirstRate®, 1 qt. Roundup PowerMAX®, 4.5 oz. Anthem® Maxx | 

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

2021 Iowa Soybean SINGULATION STUDY 15 IN. ROWS

2021 Iowa Soybean STARTER FERTILIZER STUDY 2X2X2

Starter Fertilizer Study

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