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Question: I am looking to upgrade my planter. My average corn yield is 175 bu/A. How much yield gain can I expect from better seed placement?
Pennsylvania Extension surveyed 80 fields for deviation of stand. We found that most planters are operating at about a 4 inch deviation. That means that there is about 5-10bu/acre left on the table for no other reason that stand variability. Purdue found about a 2.5-5 bu per inch deviation from 2 inch base. I have seen worn planters renewed with new parts achieving 1.7 inch deviations which is really the goal to be below 2 inch. In my area of Central, Pa. we are planting higher and higher populations and it appears that we need to perhaps consider narrower rows 26- 22-15 or twins we need more research in this area but perhaps fixing an existing planter and allowing for the next genetic advances that may push yields higher might not be a bad idea. Stay tuned there is a lot of debate on this topic.