A B C D E F G H I J K L M N
Corn-Soybean Rotation Corn-Soybean-Wheat Rotation Corn-Soybean-Wheat-Meadow Rotation Table 1 C-factors Weighted by Percent of Crop Rotation in the Watershed
15% of watershed 75% of watershed 10% of watershed Tillage Practice Corn Soybeans Small Grains
Conventional Till (Spring Plow) Conventional Till (Spring Plow) Conventional Till (Spring Plow) Conventional Till 0.24 0.30 0.17
Corn after Soybean 0.30 Corn after Wheat4 0.25 Corn after Meadow 0.11 Reduced Till 0.15 0.14 0.13
Soybean after Corn1,7 0.30 Soybean after Corn1,7 0.30 Soybean after Corn1,7 0.30 Mulch-Till 0.13 0.13 0.12
Reduced-Till (20% Cover) Wheat after Soybean5,6 0.17 Wheat after Soybean5 0.17 No-Till 0.04 0.03 0.08
Corn after Soybean2 0.25 Reduced-Till (20% Cover) Meadow after Wheat 0.004
Soybean after Corn1,7 0.14 Corn after Wheat2,4 0.147 Reduced-Till (20% Cover) Table 2 Percent of Each Tillage Practice
Mulch-Till (30% cover) Soybean after Corn1,7 0.145 Corn after Meadow2 0.08 Tillage Practice Corn Soybeans Small Grains
Corn after Soybean2 0.22 Wheat after Soybean5 0.13 Soybean after Corn1,7 0.14 Conventional Till 0% 0% 0%
Soybean after Corn1,7 0.13 Mulch-Till (30% cover) Wheat after Soybean5 0.13 Reduced Till 60% 15% 10%
No-Till (90% Cover) Corn after Wheat2,4 0.126 Meadow after Wheat 0.004 Mulch-Till 10% 30% 60%
Corn after Soybean3 0.12 Soybean after Corn1,7 0.13 Mulch-Till (30% cover) No-Till 30% 55% 30%
Soybean after Corn1 0.03 Wheat after Soybean5 0.12 Corn after Meadow2 0.06
No-Till (90% Cover) Soybean after Corn1,7 0.13 C-factors Weighted by Percent of Each Tillage Practice
Corn after Wheat4 0.03 Wheat after Soybean5 0.12 Corn Soybeans Small Grains Grassland
Soybean after Corn1 0.03 Meadow after Wheat 0.004 0.12 0.08 0.11 0.004
Wheat after Soybean3,5 0.08 No-Till (90% Cover)
1Assumed Drilled Corn after Meadow 0.01
2Tilled in the Spring, so c-factor is multiplied by 0.7 Soybean after Corn1 0.03
3Used 40% Cover Wheat after Soybean3,5 0.08
4Used Corn after Small Grain Meadow after Wheat 0.004
5Used Small Grain after Soybean
6Used Fall Plow Value
7Used an average value of Spring and Fall tillage numbers
