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SOYBEAN YIELD RESPONSE IN 30 INCH ROWS AT VARYING PLANTING POPULATIONS AT LATE PLANTING

Applied Research

Wm. Bruce Clevenger
Associate Professor and Field Specialist, Farm Management
Ohio State University Extension
Napoleon

Abstract

\r\n Farmers are presented with delayed planting decisions about soybean seeding rates because of weather delays.  A 2011 plot was established in a randomized complete block design with five different planting population treatments per acre (80K, 100K, 140K, 180K, 220K).  Treatments were replicated six times and planted, June 7th, using a two-row, tractor mounted, plot planter.  Each treatment area was four 30-inch rows measuring 10 feet wide by 30 feet long.  Stand counts were conducted when soybeans were at VE/VC growth stage on June 23 and repeated pre-harvest on October 6 at R7 growth stage.   Plots were harvested with a small plot combine with an on-board calibrated scale to determine yield measurements.  There was no significant difference in soybean yield of the two lower planting populations.  The higher planting populations of 140,000, 180,000, 220,000 seeds per acre were significantly different than two lower planting populations; although, there was no difference in soybean yield among the three higher planting populations.  Net return increased as target and actual final plant populations increased.  However, caution should be given to the rising net returns above the 140,000 seeding rate because the yield responses at 180,000 and 220,000 target populations were not significantly different than the 140,000 target population yield. Overall yields for the field were very good for the late planting date and weather conditions compared to historical averages. No significant disease or insects was observed during the growing season.

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Poster has NOT been presented at any previous NACAA AM/PIC

This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.

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Authors: W.B. Clevenger, A.E. Dorrance
  1. Clevenger, W. Assistant Professor and Extension Educator, Ohio State University Extension, Ohio, 43512
  2. Dorrance, A. Professor and Extension Specialist, Ohio State University Extension, Ohio, 44691