Odor and Nutrient Management Newsletter

Fall 2000

Plan now for fall manure applications

by Angie Rieck-Hinz, Department of Agronomy

With harvest time right around the corner, now is an ideal time to plan for fall manure applications. The extended periods of dry, warm weather the past several falls, coupled with early harvests, have given producers more time to apply all stored manure in the fall.

Fall manure applications also have the benefit of good soil conditions. Usually, the soil is drier in the fall than in the spring and fall manure applications made on the right soil conditions can reduce the potential for compaction.

Manure Allocation to Fields

Manure should be allocated to fields as follows:
Fields that test very low in P and K and will be planted to corn.
Fields that test low in P and K and will be planted to corn.
Fields that test very low in P and K and will be planted to soybean.
Fields that test low in P and K and will be planted to soybean.

This information was adapted from Iowa State University Extension Publication PM 1811, Managing Manure Nutrients for Crop Production. Also see PM 1688, General Guide for Crop Nutrient Recommendations in Iowa for more information.

Although fall manure applications can be beneficial, there is also a concern: nutrient availability. Ideally, crop nutrient applications should be made as close as possible to the crop growing season to reduce nutrient loss to the environment through volatilization, leaching, denitrification, or surface runoff. Manure should not be applied until soil temperatures are 50oF and falling. If possible, manure should not be applied to frozen or snow-covered soil.

Other factors to consider when applying manure this fall include the following:

• Take soil tests and determine which fields will benefit most from manure phosphorus (P) and potassium (K).
• Consult your manure management plan regarding rates to be applied.
•Document manure applications: where, when, how, and amount applied.
• Follow your conservation plan to maintain residue and manage erosion concerns.
• Follow setback distance requirements for manure applications.

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Page last updated October 5, 2004

Iowa Manure Matters: Odor and Nutrient Management is published by Iowa State University Extension, with funding support from the USDA Natural Resource Conservation Service through Cooperative Agreement No. 74-6114-8-22. To subscribe or change the address of a current subscription, write to Angela Rieck-Hinz, 2104 Agronomy Hall, Iowa State University, Ames, Iowa, 50011-1010 or call 515-294-9590, fax 515-294-9985 or email: amrieck@iastate.edu. Please indicate you are inquiring about the Odor and Nutrient Management Newsletter. The newsletter's coordinators are Angela Rieck-Hinz, extension program specialist, Department of Agronomy, Wendy Powers, environmental extension specialist, Department of Animal Science, and Robert Burns, Department of Agricultural and Biosystems Engineering; the editor is Jean McGuire, the subscription manager is Rachel Klein, the production designer is Beth Kroeschell, and the web page designer is Liisa Jarvinen.

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