- (a) All nutrient applications of commercial fertilizers within a nutrient surplus area must comply with the protective rate set forth in Appendix B unless a different rate is specified in an approved nutrient management plan.
(b)
(1) The protective rate is the rate of a designated nutrient that:
- (A) Provides for proper crop use; and
- (B) Prevents significant impact to waters within the state.
- (2) A soil test is required before applying commercial fertilizers containing phosphorus at the protective rate.
- (3) Commercial fertilizer containing nitrogen but not phosphorus may be applied without a soil test.
- (4) Specific rates are set out in Appendix B of this part.