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Soybean Growth Stages

Soybean Growth Stages. Chad Lee, Ph.D. Grain Crops Extension Specialist University of Kentucky. How a Soybean Plant Develops, Special Report No. 53 Iowa State University Press $2.00

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Soybean Growth Stages

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  1. Soybean Growth Stages Chad Lee, Ph.D. Grain Crops Extension Specialist University of Kentucky

  2. How a Soybean Plant Develops, Special Report No. 53 • Iowa State University Press • $2.00 • Extension Distribution Center119 Printing and Publications BuildingIowa State UniversityAmes, Iowa 50011-3171 Telephone: (515) 294-5247Fax: (515) 294-2945 • http://www.extension.iastate.edu/Pages/hancock/agriculture/soybean/bean_develop/ The information in the presentation comes from Iowa State Special Report No.53. This is an excellent resource for any producer or agronomist.

  3. VC VE

  4. hypocotyl “Poking through”

  5. VC V1

  6. V2 Rhizobia have colonized the roots. N – fixation has begun. The roots are growing through the top 6 inches of soil.

  7. V3

  8. V5 V6 Axillary Buds • Form flowers that develop into pods • Form axillary stems, which form more axillary buds • Remain dormant

  9. V5 V6 Apex (Growing Point) • Dominant in vegetative growth (plant will grow up before growing out) • If the apex is destroyed, the axillary buds will produce many stems, causing the plant to “bush out”.

  10. V7 R1

  11. R2 – Full Flower

  12. R2

  13. R3 – Beginning pod

  14. R4 – Full Pod

  15. R4 – Full Pod

  16. R4 – Full Pod Start of the most critical period for yield determination. From R4 through R6, yield potential is more susceptible to stress than any other period.

  17. R5 – Beginning Seed

  18. R6 – Full Seed

  19. R7 – Beginning Maturity

  20. R6 R8

  21. Thank you!

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