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3/9/21
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GrassHay and Pasture Nutrient Management
DanielH. Smith, CCASouthwest Regional Specialist
Nutrient and Pest Management ProgramUniversity of Wisconsin-Madison CALS and Division of Extension
@agronomybadger
Disclaimer: Any use of trade names is for descriptive purposes and does not represent an endorsement by the author.
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Soil Testing
• Estimate the nutrients needed for economically profitable forage production.
• 10 cores per 5 acres minimum standard= 1 composite sample.
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Soil pH Management
Recommended Target Soil pH
• Pasture pH= 6.0
• Pasture >30% legumes pH= 6.3
• Grass Hay pH= 6.0
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Nitrogen
Laboski C.A., Shelley, K.B. 2013. “Soil Fertility Guidelines for Pastures in Wisconsin” University of Wisconsin-Madison. Extension Publication A4034.
Similar levels recommended for nitrogen applications to grass hay fields.
Economics!
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Nitrogen Management inEstablished Pastures
• Pasture Species• >30% legume mixture, 30-50 lbs
N/ac/ yr transfered to grasses, nocommercial N necessary
• If applying additional commercial nitrogen, Be careful! Grass will become more competit ive.
• No enough N=weak stand and invite for competit ion from weeds!
Laboski C.A., Shelley, K.B. 2013. “Soil Fertility Guidelines for Pastures in Wisconsin” University of Wisconsin-Madison. Extension Publication A4034.
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Nitrogen Management in Pastures• Timing
• For pasture grass stands, apply up to 130 lbs N/acre for soils with 2-9.9% OM
• Apply in split applicat ions:• 40-80 lbs early June• 40-80 lbs early August
• Caution- nitrate poisoning• Volatilization- apply before a light
precipitat ion event.
Laboski C.A., Shelley, K.B. 2013. “Soil Fertility Guidelines for Pastures in Wisconsin” University of Wisconsin-Madison. Extension Publication A4034.
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Phosphorus
Laboski C.A., Shelley, K.B. 2013. “Soil Fertility Guidelines for Pastures in Wisconsin” University of Wisconsin-Madison. Extension Publication A4034.
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Nutrient Removal
• 1 ton/ac of pasture/grass hay removes 55 lb of K2O (plant available K)
• A 3-ton harvest =165 lb K2O removal in one year!
• Equivalent to ~ 266 lb ofpotash/A
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Manure Applications
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Manure Crediting
Laboski C.A., Shelley, K.B. 2013. “Soil Fertility Guidelines for Pastures in W isconsin” University of Wisconsin-Madison. Extension Publication A4034. Laboski C.A., Peters J. 2012. “Nutrient application guidelines for field, vegetable, and fru it crops in Wisconsin” University of Wisconsin-Madison.Extension Publicat ion A2809.
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SnapPlus for Pasture Nutrient Management
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SnapPlus for Pasture Nutrient Management
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SnapPlus for Pasture Nutrient Management
N-P-K= 60-30-70 lb/ac
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SnapPlus for Pasture Nutrient Management
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SnapPlus for Pasture Nutrient Management
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SnapPlus for Pasture Nutrient Management
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Runoff Risk Advisory Forecast
http://www.manureadvisorysystem.wi.gov/runoffrisk/index
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Interested in LearningMore?
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Daniel H. Smith, CCASouthwest Regional Specialist
Nutrient and Pest Management ProgramUW-MadisonCALSandDivisionof Extension
Email:[email protected] Phone:608-219-5170
Twitter: @agronomybadger
Questions?
Thanks!
Disclaimer: Any use of trade names is for descriptive purposes and does not represent an endorsement by the author.
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