Project Details:

Improving yields of double crop soybean with starter and foliar fertilization

Parent Project: This is the first year of this project.
Checkoff Organization:Kansas Soybean Commission
Categories:Soil and tillage management
Organization Project Code:
Project Year:2012
Lead Principal Investigator:Dorivar Ruiz-Diaz (Kansas State University)
Co-Principal Investigators:
Stewart R. Duncan (Kansas State University)
Kent Martin (Kansas State University)
Douglas Shoup (Kansas State University)

Contributing Organizations

Funding Institutions

Information and Results

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Project Summary

Nutrient availability is highest when fertilizer is applied just prior to soybean needs. However, particularly under double crop system, fertilizer is usually applied before wheat for both crops. A good wheat crop can take up more nutrients than expected, often leaving soybeans short of nutrients and limiting soybean yields. Wheat and soybeans have different nutrient requirements and grow under different soil conditions, and fertilization of each crop separately may be beneficial and increase yields. Soil fertility research on double crop soybean after wheat is limited, and most studies focus on regular full season soybean. Producers question about possible differences in nutrient requirements, and specific nutrients that may be particularly important under double crop system compared to full season.

Information is also needed to provide data to evaluate current fertilization recommendations in Kansas. With uncertainly in fertilizer prices and with increasing average crop yields, Kansas soybean producers can maximize profits by identifying situations where fertilizer should or should not be applied.

Project Objectives

1. Determine fertilization requirements for soybean growth under double crop systems after wheat as compared to full season soybean including nutrient uptake and yield.
2. Assess soybean grain yield and early growth response to starter application of NPK, Sulfur, and micronutrients (Zn, Mn, Fe), and compare responses with and without additional foliar fertilizer application.
3. Verify potential soil parameters that could be related to responses to starter and foliar applied macro and micronutrients.
4. Determine if foliar applied fertilizers can maximize yields and increase nutrient use efficiency when combined with starter applied fertilizers.

Project Deliverables

Progress of Work

Final Project Results

Benefit to Soybean Farmers

Performance Metrics

Project Years