Tillage management for manure cropland
2003
- UW-Madison Dept. of Soil Science
Project Media
Nutrient management planning requirements will soon be implemented for most Wisconsin farms. This will result in greater accounting for nutrient credits and will likely prescribe manure application at more modest rates, especially if applied using a P basis. Planners will have to allocate manure to more acres, much of it sloping and managed with high residue tillage systems designed to meet “T” as required by the conservation plan. Manure will be directed to fields where corn was the previous crop because legume N credits will supply N needs for corn when rotating from alfalfa. Many producers will be concerned that leaving manure on the surface where high residue levels already exist may cause poorer planter performance and that the additional residue will exacerbate soil conditions that promote slow early growth. Surface crop residue is an important conservation practice for sloping fields. Numerous studies have shown that tillage that buries significant crop residue increases the potential for soil loss and the risk of P delivery to surface water. Thus a conflict in implementation may develop as producers decide whether they should follow their nutrient management plan or their conservation plan, or create a hybrid strategy that does not meet the specifications of either plan.