View Full Table | Close Full ViewTable 1.

Soil, pasture, and runoff parameters for rainfall simulations conducted in fall 2005 and spring 20101

 
Tillage system
Item No tillage Light disk Conventional SE
Residue cover, %
    Fall 2005 97c 86b 4a 4.0
    Spring 2010 78 b 87 b 61a 4.5
Runoff volume, L
    Fall 2005 14.6c 30.1b 56.9a 8.2
    Spring 2010 23.8 10.5 21.4 8.4
Total solids, kg/ha
    Fall 2005 352.5a 630.0b 3,975.0c 8.1
    Spring 2010 12.7a 46.8a 558.0b 8.4
Ammonia N, kg/ha
    Fall 2005 0.076 a 0.208 ab 0.281 b 0.001
    Spring 2010 0.016 0.003 0.020 0.001
Nitrate N, kg/ha
    Fall 2005 0.353 0.609 0.084 0.001
    Spring 2010 0.015 0.006 0.014 0.001
Total P, kg/ha
    Fall 2005 0.101a 0.171a 0.604b 0.001
    Spring 2010 0.031 0.015 0.042 0.001
a,bMeans within each row with differing superscripts are different (P < 0.05).
1Rainfall simulation conducted after planting before emergence of wheat seedlings in September 2005 and before placement of steers on pasture for the spring grazeout period. Least-squares means were separated using the least significant difference procedure.



View Full Table | Close Full ViewTable 2.

Soil analysis of small grain fields after 8 yr of management using no tillage, light disk and broadcast, or conventional clean tillage methods of establishment

 
Tillage system
Item No tillage Light disk Conventional SE
Carbon, %
    0 to 5 cm depth 1.50by 1.58by 0.99ax 0.04
    5 to 10 cm depth 0.78x 0.84x 0.92x 0.04
Nitrogen, mg/kg
    0 to 5 cm depth 1,749by 1,725by 1,155ax 44.5
    5 to 10 cm depth 997x 1,000x 1,082x 44.5
Phosphorus, mg/kg
    0 to 5 cm depth 61by 65by 42ax 3.2
    5 to 10 cm depth 43x 44x 42x 3.2
Calcium, mg/kg
    0 to 5 cm depth 1,598aby 1,738by 1,262ax 94.5
    5 to 10 cm depth 1,166x 1,327x 1,278x 94.5
Sulfur, mg/kg
    0 to 5 cm depth 18.9by 20.4by 13.9ax 0.69
    5 to 10 cm depth 12.7x 13.0x 13.5x 0.69
a,bMeans within rows with differing superscripts differ (P < 0.05).
x,,yMeans within columns with differing superscripts differ (P < 0.05).