35 Ill. Adm. Code 560.APPENDIX A
A Agronomic Fertilization Rates for Various Illinois Crops
Section 560
Section 560.APPENDIX A
Agronomic Fertilization Rates for Various Illinois Crops
POUNDS
OF NUTRIENT
CROP
AVAILABLE
N
P
2
O
5
K
2
O
Corn for grain
1.3/bu.
.55/bu.
0.28/bu.
Corn silage
7.5/T
3.1/T
9.4/T
Wheat (1)
2.3/bu.
0.68/bu.
2.0/bu.
Oats (1)
1.1/bu.
0.40/bu.
1.5/bu.
Barley (1)
1.5/bu.
0.55/bu.
1.0/bu.
Rye (1)
2.2/bu.
0.69/bu.
1.8/bu.
Grain sorghum for grain
2.0/100
lbs.
0.75/100
lbs.
0.38/100
lbs.
Grain sorghum for silage
7.5/T
3.1/T
9.4/T
Tall fescue
39/T
19/T
53/T
Bromegrass
33/T
13/T
51/T
Sorghum-Sudan
40/T
15/T
59/T
Orchard Grass
50/T
17/T
63/T
Timothy
38/T
14/T
63/T
Reed Canary Grass
55/T
13/T
50/T
Alfalfa
(2)
10/T
60/T
Clovers
(2)
15/T
60/T
Soybeans
(2)
1.1/bu.
2.4/bu.
(1) If straw is removed.
(2) Legumes can obtain most of their N from the air and are
normally not fertilized with N. However, if included in a crop rotation with
nitrogen using crops, they will use the available N in the soil and not fix N
from the air. Therefore, it can be assumed that they will remove as much N as
corn for grain would in the same rotation.
This information is general in
nature and may not reflect an accurate recommendation for all areas or soil
types of the State. Any recognized fertility recommendation for Illinois
crops, climate and soils is acceptable in lieu of these general figures. In
order to obtain more accurate recommendations for phosphorus and potassium,
soil testing should be done.