University of Maryland Extension

Agricultural Nutrient Management Program

Base Name: 
anmp

C Factor

Q. One of my producers does not know which of several crops he will plant next year. What should I use to determine the C factor? The most erosive crop? The average of all possible crops he may grow? A. If a producer does not know which of several crops he will grow, choose the most erosive...

Revised Universal Soil Loss Equation - FAQs

The following categories deal with the most frequently asked questions about the Revised Universal Soil Loss Equation (RUSLE): C Factor P Factor

Marsh or Wetland

Q. Is a marsh or wetland considered surface water? A. Yes, it is considered surface water. ( Source: Dr. Frank Coale, Chair, Department of Environmental Science and Technology, UMCP )

Ditches

Q. Does a ditch that runs into the woods have to be considered as surface water? A. Yes. Unless a ditch that drains a field empties into a sediment pond, it must be considered surface water. ( Source: Dr. Frank Coale, Professor, Department of Environmental Science and Technology, UMCP )

Grassed Waterways

Q. Is a grassed waterway considered surface water? A. No. A grassed waterway is not considered surface water. ( Source: Dr. Frank Coale, Professor, Department of Environmental Science and Technology, UMCP )

Ponds

Q. Are ponds considered "surface water?" ( Posted April 1, 2003 ) A. If water has never been known to exit the pond via an overflow or spillway, the pond is "isolated" (as opposed to "continuous") and does not have to be considered as surface water. If water exits the pond at any time, it is...

Water Leads or Shovel Ditches

Q. Is a water lead or a shovel ditch considered "surface water?" ( Posted April 1, 2003 ) A. No. For the sake of the P risk assessment tools (PSI/PMT) , surface water is defined as any permanent, continuous, physical conduit for transporting water. Shovel ditches and water leads are not permanent...

Surface Water

Water Leads or Shovel Ditches Ponds Grassed Waterways Ditches Marsh or Wetland Grassed Buffers

Soil Drainage

Q. If a field has tile drains in only a portion of the field, should it be considered as having "artificial subsurface drainage?" A. If any part of a field is drained, consider the entire field drained when calculating UM-PMT.( Source: Dr. Joshua McGrath, Associate Professor, Department of...

P Risk Assessments for High Tunnels

Q. Is it necessary to do a P risk assessment (PSI/PMT) for crops grown in high tunnels? The soil test FIV-P is >150 and the crops are planted in the soil; however, the high tunnel sheds the rain which eliminates potential for erosion and runoff. (Posted 11-11, revised 10-16) A. Due to the...

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