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Soybean Plant Population. How Low Can We Go?

Soybean Plant Population. How Low Can We Go?. Introduction. Recent research indicates we may be planting higher populations then necessary Improved varieties Improved stands Current recommendations:. Objectives.

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Soybean Plant Population. How Low Can We Go?

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  1. Soybean Plant Population. How Low Can We Go?

  2. Introduction • Recent research indicates we may be planting higher populations then necessary • Improved varieties • Improved stands • Current recommendations:

  3. Objectives • To evaluate the effects of “lower than optimal” plant populations on soybean yield • To evaluate the effects of these populations across different row spacings and planting units

  4. Study conducted at John Hoffman’s near New Hope Experimental Design: Split-Strip Plot Three populations 160,000 120,000 80,000 Four planting tools Kinze 3500 (15”) Kinze 3500 (30”) Sunflower 9412 (15”) Sunflower 9412 (7.5”) Three replications Strips were 20’ x 300’ Methods

  5. Methods • Planted May 24 • Variety • NK S43-B1 • Indeterminate • RR • Cruiser Max

  6. Methods • Fertilizer Program • 1.5 ton litter pre-plant • Chemical Program • PRE: 1 qt RU O-max; 0.125 qt Alliance • POST: 1 qt RU O-max; 0.125 qt Alliance; 6 oz Select (volunteer RR corn); ½ qt crop oil • Field was irrigated

  7. Data Collection • Stand counts made at V4-V5 stage • Several locations averaged within each strip • Harvested November 3

  8. Results: Stand Establishment

  9. a a a a Results: Did planter affect yield?

  10. a a a Results: Did population affect yield?

  11. Discussion • No difference in yield b/w 64,000 to 125,000 plants/acre! • Planter type had no affect on final plant stands • No difference in yield b/w planter types

  12. Discussion • Can we really get away with 64,000 plants? • I would be cautious • Exceptional site • Irrigated site • Excellent variety • Stand uniformity was there • What about 100,000 plants? • I think this would work • Must get good seed placement, no room for error

  13. What’s Next • Examine effects for different growth habits • Bushy vs tall beans • Canopy closure is critical for lower population • Do not recommend for DC beans • Examine effects without irrigation

  14. QUESTIONS ON THIS?

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