Precision Planting

Description

This research builds on the project conducted from 2009 to 2013 on soybean seeding rates in a range of soybean maturity zones (Aberdeen, Volga, Beresford) in South Dakota. Data from this research revealed that narrow row yields were equal or greater than yields in 30-inch row spacing and that higher seeding rates also increased yield. Additionally, variety performance was affected by row spacing in some instances. Unfortunately, there has been a 24% shift in acres planted back to wider rows (20-inch to 30-inch) from 2009 to 2013 in South Dakota according to USDA-NASS. Some important changes in the treatment structure are needed to address current producer trends and concerns on variety selection for narrow versus wider row spacing.

Treatments:
• Two soybean varieties; one variety adapted to narrow rows/white mold resistance and one adapted for wide rows/white mold susceptible).
• Two row spacing (8 and 30-inch).
• Four seeding rates (100K, 135K, 170K, and 205K).

Expected outcomes/Significance to growers:
Local data by recommended maturity zones for South Dakota are needed by growers to determine which row spacing, seeding rate, and variety selection combination will consistently maximize yield.

This project is a collaborative effort of SDSU Research, SDSU Extension, South Dakota Agricultural Experiment Station, and the South Dakota Soybean Research and Promotion Council.

For more information, contact;
Dr. Thandi Nleya, Associate Professor, Plant Science
Thandiwe.Nleya@SDSTATE.EDU