Posted: February 2, 2023
This article focuses on Manure Spreader calibration and why it is important when developing and implementing an Act 38 Nutrient Management Plan (NMP).
Manure spreader calibrations are the backbone of applying nutrients efficiently for each Crop Management Unit (CMU) in a NMP. Calibration can also reduce the need for supplemental fertilizer and negative environmental impacts. All the calculations for balancing nutrients and timing of the applications will be pointless if the equipment cannot deliver the manure at a uniform rate.
Nutrient Management Plan requirements:
Section 83.294 of the Nutrient Management regulations detail that manure application rates listed in a NMP must be consistent with the capabilities of the equipment being used by an existing operation, or if being developed for a proposed operation, must verify in writing that a calibration will be performed prior to the first application of manure. If the equipment cannot meet the planned rate(s) listed in the approved NMP, the NMP will need to be updated to reflect the actual achievable rates.
How many calibrations are needed?
The NMP Summary and Appendix 2 must list all equipment that will be used, their practical application rates and the settings (speed, gear, RPMs, etc.) used to obtain each planned manure rate listed in the NMP. The Manure Spreader Calibration Notes table is designed to accomplish two things:
- Provide a quick reference for the operator or other applicator to find or recall the correct tractor and equipment settings that were used to achieve the various application rates listed in the plan.
- Provide a place to make notes, and to serve as a starting point for when adjustments become necessary due to tractor and equipment changes, changes in manure consistency, or an existing calibration needs to be modified.
Remember that actual manure spreader calibration data is required to be included in the NMP.
What if I rent equipment or use a custom hauler?
Rental equipment needs to be calibrated each time it is used on the farm and those records need to be maintained with the manure application records.
The Custom Hauler's name and manure hauler/broker certification number needs to be listed. Operators need to confirm that custom haulers equipment can achieve the rates necessary for their type of manure and provide field maps, and application rates for all CMUs.
Recordkeeping:
Land application of nutrients records must be kept on an annual crop year basis and include when and where the nutrients were applied and at what rate for each CMU. These records should be viewed during the NMP On-Site Status review and at each subsequent status review with the operator.
In conclusion, manure spreader calibration is an essential element of nutrient management planning to ensure that manure application rates are reasonable and achievable for all NMPs. For more information on how to calibrate a manure spreader please refer to Agronomy Facts 68 - Manure Spreader Calibration or please refer to the NM Technical Manual - Appendix 2 Operational Information Pages 5-7 for information on how to document calibration in a NMP.
For additional guidance on this topic please contact the SCC Regional Coordinator that covers the county that you are working in.
Laurel P. Rush |Nutrient & Odor Management Program | Regional Coordinator
State Conservation Commission
Phone: 215-287-3728 (cell)
Email: larush@pa.gov
