Soybean Meeting Roseau, MN'

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Soybean Meeting Roseau, MN.

• RUSS SEVERSON
• POLK COUNTY EXTENSON EDUCATOR
• CROOKSTON, MN.
• Wednesday, Nov. 15, 2000

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SOYBEAN FERTILITY

• Nitrogen management
• Soybean plant is a legume
• Proper nodulation
• Utilizes nitrogen from the air
• Additional nitrogen not needed
• No previous soybean history
• Soil test less than 75 N
• Add 50 N

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1998 soybean study Kittson Co.
(soil test 105N)
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Soil test RLF Ada 112N 128N
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1999 Soybean Nitrogen Trial Crookston 1999
Soil test 37N
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Phosphorus/Potassium

• Broadcast and incorp. before planting
• Can be applied as starter or band (2X2)
• Soybean are very sensitive to salt injury
• No fertilizer in contact with the seed
• Rates based on YG and ST

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P K Recommendations

• P2O5 Rec. (1.55 (.14)(Olsen P, ppm)) (Yield
  Goal)
• K2O Rec. (2.20 (.0183)(K Soil Test, ppm))
  (Yield Goal) 

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OTHER NUTRIENTS

• Iron
• Soil pH gt 7.3 can induce iron chlorosis
• Cool Wet soil (Stress)
• High CaCo3 High Salt (Stress)
• Variety selection
• Cultivation
• Inoculation

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Susceptibility to chlorosis subsequent
herbicide interaction
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Other Nutrients

• Research at MN indicates no response to
• Sulfur
• Magnesium
• Zinc
• Manganese
• Copper
• Boron

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QUESTIONS
?