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Risk and Benefits of Changing Farmersí Common Soybean Seeding Rates
March 2016

By Peter Kyveryga, Ph.D.
Director of Analytics
Iowa Soybean Association
Phone: 515-294-0872


Executive Summary
(5 min 18 sec)

Full Presentation
(14 min 48 sec)


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for PC, Mac, and
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for iPhone


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Summary: With higher seed cost and lower commodity prices, there are many questions about optimizing soybean seeding rates and variable rate soybean planting. This presentation will discuss results of multi-year on-farm studies to identify when and where farmers can increase or decrease their normal or common soybean seeding rates. The focus will be on the predictive power of on-farm trials and the economic benefit of changing common soybean seeding rates for categories with different plant row spacing, planting dates, rainfall, soil, and field topography. Risk analysis indicates no significant effects of spatial factors on soybean yield response to higher seeding rates but higher probability of economic yield response after May 20 planting in normal years or after June 15 in years with delayed planting.

Responsibility: United Soybean Board (USB) farmer-leaders develop and maintain partnerships with U.S. land grant universities and U.S. ag-focused research organizations such as the Plant Management Network to increase the transfer of checkoff-funded applied and practical production research information to U.S. soybean farmers. USB neither recommends nor discourages the implementation of any advice contained herein, and is not liable for the use or misuse of the information provided.

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