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Crop and Soil Response to Wheel-Track Compaction of a Claypan Soil

^a Kansas State Univ., Southeast Agric. Res. Center, P.O. Box 316, Parsons, KS 67357
^b Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506
^c Real Life Enterprises, 9643 W. Compton Ct., Star, ID 83669

View larger version (20K): [in a new window]   Fig. 1. Plot diagram of wheel-track treatments.

View larger version (38K): [in a new window]   Fig. 2. Rainfall (bars) and number of days that maximum air temperature was 35°C (squares) during the growing season from 1987 through 1989 at Columbus, KS.

View larger version (32K): [in a new window]   Fig. 3. Effect of compaction treatments [ALL = all area compacted; WT = wheel-track compaction; WTC = wheel-trackcompaction followed by chisel plowing to remove tracks; and NO = no intentional compaction] on average soybean yield during 3 yr. Within years, bars with the same letter are not statistically different at P < 0.05 according to the LSD test.

View larger version (34K): [in a new window]   Fig. 4. Effect of compaction treatments [ALL = all area compacted; WT = wheel-track compaction; WTC = wheel-trackcompaction followed by chisel plowing to remove tracks; and NO = no intentional compaction] on grain sorghum yield during 3 yr. Within years, bars with the same letter are not statistically different at P < 0.10 according to the LSD test.

View larger version (33K): [in a new window]   Fig. 5. Average soil bulk density in and out of wheel tracks in no chisel and chisel plow treatments during 1987 through 1989. Treatments are: WT-IN (in wheel tracks—no chisel plow), WT-OUT (out of wheel tracks—no chisel plow), WTC-IN (in wheel tracks—chisel plowed), and WTC-OUT (out of wheel tracks—chisel plowed). Within depths, bars with the same letter are not statistically different at P < 0.10 according to the LSD test.

View larger version (13K): [in a new window]   Fig. 6. Average air permeability in and out of wheel tracks in no chisel and chisel plow treatments during 1987 through 1989. Treatments are: WT-IN (in wheel tracks—no chisel plow), WT-OUT (out of wheel tracks—no chisel plow), WTC-IN (in wheel tracks—chisel plowed), and WTC-OUT (out of wheel tracks—chisel plowed). Bars with the same letter are not statistically different at P < 0.10 according to the LSD test.

View larger version (20K): [in a new window]   Fig. 7. Cone penetration resistance in and out of tracks in chisel and chisel plow treatments. Treatments are: WT-IN (in wheel tracks—no chisel plow), WT-OUT (out of wheel tracks—no chisel plow), WTC-IN (in wheel tracks—chisel plowed), and WTC-OUT (out of wheel tracks—chisel plowed). At selected depths, bars with the same letter are not statistically different at P < 0.05 according to the LSD test.