Project Details:

Nutrient Management for Profitable Soybean Production in Minnesota

Parent Project: This is the first year of this project.
Checkoff Organization:Minnesota Soybean Research and Promotion Council
Categories:Soil fertility
Organization Project Code:10-15-49-19-184-7527
Project Year:2019
Lead Principal Investigator:Daniel Kaiser (University of Minnesota)
Co-Principal Investigators:

Contributing Organizations

Funding Institutions

Information and Results

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Project Summary

Interest in potassium (K) fertility in soybean has increased recently. The primary source of potassium fertilizer is KCl which contains 50% chloride (Cl) by weight. Soybean yield decreases have been found during recent years and decreased grain protein and increased oil have occurred for soybean within K trials conducted across Minnesota. The goal of this work is to determine whether Cl applied to soybean may negatively impact soybean grain yield and quality and whether Minnesota soybean farmers need to avoid application of KCl directly ahead of the soybean crop or apply a different source of K fertilizer. Past research has shown yield decreases in single year K fertility trials but long-term trials are more advantageous as the impacts of weather can be assessed at each location on the build-up of Cl in the soil. Grain quality will also be assessed studying protein and oil concentration along with the distribution of amino acids. Further work will study the impacts of macronutrient (P, K, and S) application on the distribution of amino acids in the grain. Past research funded by AFREC has shown that S and K can impact cysteine and methionine content. Funding from the Minnesota soybean growers provided the foundation for the development of a database for specific nutrients to study impacts on amino acid levels in the soybean grain. Past data collected from long term plots will be utilized with newly collected samples to study changes in the distribution of amino acids in the grain following differing fertilization strategies.

Project Objectives

Objective #1: Evaluate the long-term impact of potassium rate and timing in a corn/wheat-soybean rotation on soybean grain yield and quality.
a) Quantify yield effects when K fertilizer is applied at different times and rates in a two-year rotation containing soybean.
b) Quantify changes in soybean protein and oil concentration based on long term K fertilization strategies.
c) Correlate K and Ca or Mg in plant tissue to determine impacts on soybean yield.

Objective #2: Determine if the application of Cl has negative effects of soybean grain yield and quality.
a) Quantify yield impacts for K fertilizer sources applied with and without Cl.
b) Track rates of Cl buildup in poorly drained soils.
c) Quantify plant tissue Cl concentration and correlate tissue Cl concentration to the concentration of other essential nutrients.
Objective #3: Evaluate the impacts of macro-nutrients on the distribution of essential amino acids in soybean grain.
a) Assess the impact of long term application of P, K, and S on soybean protein and oil content.
b) Assess the effect of various macronutrients (P, K, and S) on amino acid distribution using NIR.
c) Develop a database containing information related to essential nutrients’ impacts on soybean grain quality.

Project Deliverables

Progress of Work

Final Project Results

Updated June 9, 2020:

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Benefit to Soybean Farmers

Performance Metrics

Project Years