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Fertility Guidelines

General Fertility Guidelines

for Forages (lbs/ac)

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 (K​2O)

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​2​O​5)

Potassium (K​2O)

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.