Uniform Stand and Narrow Rows are Needed for Higher Double-crop Soybean Yield
- David L. Holshouser *a,
- Robert D. Grissob and
- Robert M. Pitmanc
- a Tidewater Agricultural Research & Extension Center, Virginia Polytechnic Institute and State University, Suffolk 23434
b Biological Systems Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24060
c Eastern Virginia Agricultural Research & Extension Center, Virginia Polytechnic Institute and State University, Warsaw 22572
Double-crop soybean producers do not always realize a yield benefit when they convert from a 15-inch planter to a 7.5-inch grain drill. Poor seed singulation with drills was suspected to limit narrow-row yield response. Experiments were conducted to determine if a precision drill with 7.5-inch row spacing and accurate soybean seed singulation would improve stand uniformity and/or increase yield over a standard grain drill with poor seed singulation or a vacuum-meter planter with 15-inch row spacing and accurate soybean seed singulation in a double-cropped soybean system. The effects of planter speed on stand uniformity and yield were also investigated. Stand uniformity with the precision drill was equal to the vacuum-meter planter and better than the standard drill. Soybean yield with the standard drill was equal to the vacuum-meter planter in three of four years and less than the vacuum-meter planter in one year. Soybean yields were greater when planted with the precision drill than when planted with the vacuum-meter planter in 2 of 3 years, and averaged 10% over three years of study. Planting speeds of 5 or 7 mph did not affect stand uniformity or yield.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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