Total Nitrogen Applied (TNA) Report / Irrigation and Nutrient Management Plan (INMP) Summary Report
Quick Links
TNA
Growers required under Ag Order 3.0 to submit a Total Nitrogen Applied (TNA) Report for their ranch must continue to submit reporting, regardless of assigned ranch Groundwater Phase Area.
Growers are required to monitor the total amount of nitrogen applied to their ranch and report information to the Water Board in a Total Nitrogen Applied (TNA) Report. This requirement is phased in, based on assigned ranch Groundwater Phase Area. Required reporting includes nitrogen applied to crops from all sources such as fertilizer, organic fertilizer, compost, irrigation water, as well as additional information.
Please refer to the links below, and the Compliance Calendar, for additional details and dates for each Groundwater Phase Area.
Calculating Excel Tools
“Weighted Average Concentration” tool to calculate the weighted average nitrogen concentration if more than one sample from one or more sources of irrigation water was used.
“Convert to Gallons” tool to convert the volume applied from acre-feet or acre-inches into gallons.
“N from Fertilizers” tool to calculate the weighted average amount of nitrogen fertilizer applied on multiple crop rotations.
“Liquid Fertilizer Nitrogen Applied” tool to calculate Pounds of Nitrogen in Liquid Fertilizers.
INMP
Growers are required to monitor the total amount of nitrogen applied and removed from their ranch and report information to the Water Board in an Irrigation and Nutrient Management Plan (INMP) Summary Report. This requirement is phased in, based on assigned ranch Groundwater Phase Area. The INMP Summary Report satisfies the TNA Report requirement; therefore, an additional, separate TNA Report is not required to be submitted when the INMP Summary Report is submitted. Eventually, all growers will be submitting INMP Summary Reports regardless of assigned ranch Groundwater Phase Area. Required reporting includes nitrogen applied to crops from all sources, nitrogen removed from the field for each specific crop, as well as additional information
Please refer to the links below, and the Compliance Calendar, for additional details and dates for each Groundwater Phase Area.
- Irrigation and Nutrient Management Plan (INMP) Summary Report Instructions - coming soon
Nitrogen Removal Conversion Coefficients
- Crop Nitrogen Removal Conversion Coefficient Standard Protocols (English | Español | 中文)
- List of Labs Qualified for Testing Nitrogen Content in Crop Material (English | Español | 中文)
- Crop Yield to Nitrogen Removed Calculator - Developed by the California Department of Food and Agriculture, Fertilizer Research and Education Program (CDFA, FREP). Use this calculator tool to find coefficient for crops not listed in the INMP drop-down menu and to obtain the most up to date coefficient values. This tool will constantly add coefficients for new crops as they become available and will update coefficient values over time.
- Additional Resources for Developed Conversion Coefficients
- University of California, Davis. Department of Land, Air and Water Resources. Reports written with support from the Kings River Watershed Coalition and the California Department of Food and Agriculture (CDFA), Fertilizer Research and Education Program (FREP).
- Geisseler, D. (2016). Nitrogen concentrations in harvested plant parts – A literature overview.
- Geisseler, D. (2021). Nitrogen concentrations in harvested plant parts – Update 03/2021.
- Geisseler, D. (2024). Nitrogen concentrations in harvested plant parts - Update 02/2024.
- University of California, Davis. Department of Land, Air and Water Resources. Reports written with support from the Kings River Watershed Coalition and the California Department of Food and Agriculture (CDFA), Fertilizer Research and Education Program (FREP).
Crop Evapotranspiration (Crop Et)
- Calculate crop evapotranspiration for a single crop via the ET calculator
- Calculate crop evapotranspiration for multiple crops and plantings via the Preservation, Inc. ET Calculator
INMP Reporting Exemptions
Video Tutorials
- Total Nitrogen Applied Recordkeeping (for TNA and INMP reporting)
- Total Nitrogen Removed and Irrigation Management Recordkeeping (for INMP Summary Reports)
Grower Workshops
Grower workshops on TNA and INMP were held to provide an overview of recordkeeping and reporting requirements. Please refer to the below presentation slides and recordings for more information.
December 2022 Workshops on recordkeeping:
