New York State P Index Calculator

The New York P index was developed by the NY P index Working Group.

• Online version of the P-Index calculator is provided below.
• Downloadable P-Index Excel Spreadsheet Calculator.

Online P Index Calculator

Dissolved P    Particulate P    Management Category
Source Factor	Your values
Soil test P (Morgan P in lbs/acre)
Fertilizer P application rate (lbs P2O5/acre)
Fertilizer P application timing	None applied May-August Sept-Oct Nov-January Feb-April
Fertilizer P application method	None applied Injected or subsurface banded Broadcast + incorporated in 1-2 days Broadcast + incorporated in 3-5 days Surface applied or broadcast/incorporated after 5 days Surface applied on frozen, snow covered or saturated ground
Organic P application #1 rate (lbs P2O5/acre)
Organic P application #1 timing	None applied May-August Sept-Oct Nov-January Feb-April
Organic P application #1 method	None applied Injected or subsurface banded Broadcast + incorporated in 1-2 days Broadcast + incorporated in 3-5 days Surface applied or broadcast/incorporated after 5 days Surface applied on frozen, snow covered or saturated ground
Organic P application #2 rate (lbs P2O5/acre)
Organic P application #2 timing	None applied May-August Sept-Oct Nov-January Feb-April
Organic P application #2 method	None applied Injected or subsurface banded Broadcast + incorporated in 1-2 days Broadcast + incorporated in 3-5 days Surface applied or broadcast/incorporated after 5 days Surface applied on frozen, snow covered or saturated ground
Dissolved P Transport Factor
Soil drainage class	Poorly or very poorly drained Somewhat poorly drained Moderately well drained Well/excessively well drained
Flooding frequency	Rare (>100 years) or never Occasional (once in 10-100 years) Frequent (<10 years frequency)
Flow distance to blue line stream (feet)
Stream type (blue line on topomap or equivalent)	Intermittent - Dashed Blue Line Perennial - Solid Blue Line
Particulate P Transport Factor
Erosion (RUSLE in tons/acre)
Flooding frequency	[ value as entered above for Dissolved P ]
Flow distance to blue line stream (feet)	[ value as entered above for Dissolved P ]
Stream type (blue line on topomap or equivalent)	[ value as entered above for Dissolved P ]
Concentrated flow?	Yes (present) No (not present)
Dissolved P Index
Particulate P index
Management Category
Total Source Score
Soil test P contribution
Fertilizer P contribution
Organic P contribution
Total Dissolved Transport Score
Flow Distance Contribution
Total Particulate Transport Score
Erosion contribution
Flow distance contribution
Concentrated flow contribution