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| The subject of plant population in soybean is strongly debated, with (as you might expect) the seed companies tending toward the high end of the range. At 140,000, you have been doing what they want you to do. I normally suggest that growers plant around 90,000 to 100,000 per acre, without a lot of regard to row spacing since plants adjust (compensate) for the space available to them. There is good research showing that yields don't drop significantly until plant population falls below about 50,000 per acre; but we can't afford to plant to that level since a partial loss of viable plants could cause a yield loss. As with anything connected with a crop, stand can't be isolated from other issues like soil fertility, planting date, plant type, maturity group, and several other things; however if most other production issues are addressed properly the lower populations can yield just as well as the high populations. One thing I caution growers about when they plant for reduced population is to include a recommended insecticide with the first post glyphosate application to reduce any damage to the stems from three cornered alfalfa hoppers; and if you are planting no-till into debris you should have an insecticide on before plants emerge for cutworms and other pests that might reduce the stand. I feel you can justify the cost saving on seed in reduced populations; but you should take better care of the plants early to avoid stand loss. You will then likely see reduced incidence of fungal infection since you get better light penetration and airflow within the canopy; and lodging should be less of a problem. One complaint I have heard from growers is that stalks are larger and are harder on the sickle bar and tires during harvest. As for frogeye, I suggest you look for ratings done in your region since reaction can vary quite a bit. Your county should have an Extension Service office that can get you connected with the soybean specialists at the University of MO, who should be able to help you. I suggest that you use information from both Extension and industry rather than just from industry. | |
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Soybean Population ?
