Solution: Crop Residue Management
Crop Residue Management: Any tillage method
that leaves crop residue on the surface to reduce erosion.
How it Works
Crop residue left on the surface shields the soil from rain and wind until
emerging plants provide a protective canopy. Crop residue also improves soil
tilth, adds organic matter to the soil, and may even result in a little grain
being left for wildlife. Less tillage reduces soil compaction and saves the
farmer time and fuel.
Three basic crop residue management systems are common in Wisconsin:
- Mulch-till uses such implements as a chisel plow or disk to till the
entire field.
- No-till leaves the soil and crop residue undisturbed except for the crop
row where the seed is placed in the ground.
- Zone or strip-till uses coulters to till a 5"-7" strip for injecting
starter fertilizer and planting in one operation.
Planning
- Plan for residue levels needed to reduce erosion. Planning for residue
cover begins at harvest. Reduce the number of tillage passes and set tillage
tools to shallower levels to leave more residue on the surface.
- Straight points and sweeps on chisel plows leave more residue than
twisted points.
- Consider your soils and crop rotation. Heavy residue (corn, for
example) on droughty soils can help conserve soil
moisture; however, heavy residue on poorly drained soils can delay spring
warming and drying.
- Nutrient and pest management practices might need to change as you farm
with higher levels of residue.
- You may need different equipment suited to the type of crop residue
management you plan to use.
Maintenance
Measure crop residue using the “knotted line” method. Divide a line into 100
equal parts and stretch it diagonally across the crop rows. Walk along the line
counting the number of marks that have residue under them. The total number of
marks with residue under them is the percent cover for the field. Take three to
five measurements in representative parts of the field.
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