Nutrient-Based Manure Application Rate
Manure application rate to meet a crop's nitrogen or phosphate need.
Example
You enter
- Crop nutrient need (lb/acre, N or P2O5) 150
- Total nutrient (lb/ton or lb/1,000 gal) 10
- First-year availability (%) 50
- Manure form solid
You get
- Application rate 30
- Applied nutrient 150
Details, formula, and sources
Application rate (ton/acre solid or 1,000 gal/acre liquid) to meet a crop N or P2O5 need from the manure total nutrient and its first-year availability. Per NRCS Code 590; the farm nutrient-management plan governs.
available_per_unit = total_nutr x availability/100; rate = crop_need / available_per_unit; applied = rate x available_per_unit = crop_need.
The nutrient-based manure application rate per USDA NRCS Conservation Practice Standard 590 (Nutrient Management), by name.
NRCS Code 590 and manure-management guidance are free at nrcs.usda.gov and from land-grant extension. A manure test and the farm's nutrient-management plan govern.
Estimate. AHJ and licensed professional govern.
Field names used by the API: crop_need, total_nutr, availability, form, rate, applied_nutrient
- Nutrient-based rate rate = crop_need / (total_nutr x availability); closes to applied = crop_needNRCS Code 590
- Form units ton/acre for solid manure (lb/ton), 1,000 gal/acre for liquid (lb/1,000 gal)extension manure guidance
- Limiting nutrient the plan sets whether N or P2O5 governs; a P-index can force a lower ratescope of this tile