If soil conservation and P management practices are maintained at current levels, impacts on surface water resources from P losses from the field will be small. Although the P delivery to surface water bodies is greater than from a field with a very low rating, current soil conservation and P management practices keep water quality impairment low. Impacts on surface water resources will be higher than for the field with a low rating, and the P delivery potential may produce some water quality impairment. Careful consideration should be given to further soil conservation and P management practices that do not increase P delivery to surface water. Water quality impairment will be large.
Remedial action is required to reduce P movement to surface water bodies.
P management practices are necessary to reduce offsite P movement and water quality degradation. Impacts on surface water resources are extreme. Remedial action is required to reduce P delivery to surface water. All necessary soil and water conservation practices plus a P management plan, which may require discontinuing P applications, must be put in place to reduce water quality impairment. See NRCS Nutrient Management Standard 590 for nutrient management recommendations.