Irrigation & Nitrogen Management Plan Information Sources

Irrigation & Nitrogen Management Plan Worksheet >> click here
PDF fillable >> click here
Excel fillable >> click here
Season Crop Evapotranspiration Estimates – Colusa and Glenn Counties (ET) >> click here
All Counties (ET) >> click here

For those with High Vulnerability Areas (HVA): As of March 1, 2021, the California Department of Food and Agriculture’s (CDFA) Fertilizer Research and Education Program (FREP), will administer the Irrigation and Nitrogen Management Training Program (INMTP). This was formerly administered through CURES. The INMTP allows growers to Self-Certify their Irrigation and Nitrogen Management Plan (INMP) Worksheet(s) under the Irrigated Lands Regulatory Program.
For additional information on the INMTP click here.
For additional information on the INMTP Continue Education Units (CEU) click here.

A few good resource on INMPs…

Fertility Management Guidance via Fertilizer Research and Education Program (FREP)
These guidelines are based on research results from studies carried out in California and elsewhere. Detailed information is summarized in a user-friendly, easily searched interactive database. Information for cotton, wheat, corn, rice, walnuts, grapevines, lettuce, almonds, processing tomatoes, alfalfa, strawberries, cauliflower and broccoli is available. Crops continue to be added.

University of California Resources – UC Nutrient Management for Fruit, Nut & Vegetable Crops
Search by crop or by topic for information. Links to UC publications with nutrient management guidance prepared by UC Farm Advisors and Researchers.

Specific Crops:
UC Fruit and Nut Research and Information Center
UC Vegetable Research and Information Center

USDA Tool to Calculate Nutrient (N, P, K) Removal by Harvested Crop
This Crop Nutrient Tool has information about N, P, and sometimes K of crop residues. Need to input yield and know what the harvested portion is.

International Plant Nutrition Institute Crop Nutrient Removal Calculator app for iPhone or iPad
Download the FREE app from the “App Store” or “iTunes” to your iPhone or iPad. About 80 crops are available, but be aware that some are listed in components (such as sugarbeet tops and sugarbeet roots) that you would need to add together if all components are removed from the field.

IPNI Nutrient Source Specifics
Fact sheets on common synthetic fertilizer materials.