Fertility Guidelines

Low-Medium Yield Potential Soils

CROP	NITROGEN	PHOSPHORUS (P​2O​5)
Grass Seed	30 – 60	10 – 25
Forage 20% Legume 40 – 90	10 – 30
Grass-Legume 20-40% Legume	30 – 65	20 – 30
40-60% Legume 10 – 30	20 – 40
Legume Greater than 60% Legume	0 – 30	30 – 50

Medium-High Yield Potential Soils

CROP	NITROGEN	PHOSPHORUS (P​2O​5)	POTASSIUM(K2O)	SULPHUR
Grass Seed	30 – 70	10 – 30	30 – 50	0 – 10
Forage 20% Legume 60 – 100	10 – 30	50 – 60	10 – 15
Grass-Legume 20-40% Legume	40 – 90	20 – 40	50 – 70	15 – 30
40-60% Legume 20 – 40	30 – 40	50 – 80	15 – 30
Legume Greater than 60% Legume	0 – 30	40 – 70	60 – 150	15 – 30

High Yield Potential Soils

CROP	NITROGEN	PHOSPHORUS (P​2O​5)	POTASSIUM(K2O)	SULPHUR
Grass Seed	45 – 100	30 – 50	40 – 60	0 – 15
Forage 20% Legume 60 – 200	30 – 50	40 – 60	0 – 15
Grass-Legume 20-40% Legume	60 – 80	40 – 60	60 – 80	15 – 20
40-60% Legume 0 – 60	40 – 80	80 – 150	15 – 30
Legume Greater than 60% Legume	0 – 50	60 – 100	80 – 200	20 – 30

^{*Residual response to the higher rates may persist for two years, particularly when the year of apllication is dry and production is low. Therefore annual application may not always be necessary.}

^{Source: Adapted from various U.S State and Canadian Prairie Province Extension Bulletins.}