Soybean Omission Trial - The Effect of Crop Inputs on Yield
Agronomy & Pest Management
Wayne Flanary
Field Specialist in Agronomy
University of Missouri Extension
St. Joseph
Abstract
The soybean omissions trial was comprised of two systems, high yield system (HYS) and a standard system (SS). The high yield system is those set of management practices which seeks to maximize yield. The standard practice system is comprised of practices which are more typical of growers with a resonable yield goal. Variety, seeding rate, row spacing, seed treatments, fertility and fungicides were factors evaluated. The treatment design compared the two systems then one practice as a treatment from the standard system was placed into the high yield system likewise one practice from the high yield system was placed into the standard system.. Five years of data indicate that lack of seed treatment and wide row spacing reduced high yield system soybean yields. However, an increase in planting population increased yields. Fungicides also increased yields. The standard systems had an increase with seed treatment, narrow row spacing and fungicide application. Early planting date had a slight increase in yield with earlier date of planting. Variety yields varied from year to year. There was a slight decrease in yield from phosphorus and potassium application.
Authors: Wayne Flanary
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Wayne Flanary Field Specialist in Agronomy, , Missouri, 64507