Shallow Drainage

Subsurface tile drains are installed more closely together, but shallower than conventional tile drainage installation in Iowa - 2.5 feet compared to 4 feet.

Corn yields and nitrate-N concentrations are not affected significantly, but tile drainage volume is reduced by an average of 32%, thus reducing nitrate load. A benefit of shallow drainage over drainage water management is that there is no need for annual or biannual management.


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