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Published in Soil Sci Soc Am J 39:744-746 (1975)
© 1975 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Degree of Soil Profile Disruption on Plant Growth and Soil Water Extraction1

K. Rakov and H. V. Eck2

ABSTRACT

Modification of slowly permeable soil profiles has been effective in ameliorating undesirable soil conditions. Various methods and depths of modification have been studied but little attention has been given to (i) the degree of disruption necessary to accomplish satisfactory profile modification or (ii) the relative merits of topsoil-subsoil mixing and stockpiling and returning topsoil to the surface after profile modification. We studied seven degrees of profile disruption (clod size distributions in the B22t and mixing of topsoil with that horizon) in simulated soil profiles in the greenhouse. Grain sorghum (Sorghum bicolor) was grown on Pullman clay loam. Disturbance of the B22t layer increased yields but once that layer was disturbed, degree of disturbance had no further effect on yield. Compared with retaining topsoil on the surface, mixing it with the B22t did not affect yields.

NOTES

1 Contribution from Soil, Water, and Air Sciences, Southern Region, Agricultural Research Service, USDA, in cooperation with The Texas Agric. Exp. Sta., Texas A&M University.

2 Research Officer, N Poushkarov Institute of Soil Science, Sofia, Bulgaria, formerly Foreign Agricultural Organization Fellow, USDA Southwestern Great Plains Research Center, Bushland, Texas and Soil Scientist, USDA Southwestern Great Plains Research Center, Bushland, Texas 79012.

Received for publication November 11, 1974. Accepted for publication March 3, 1975.






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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1975 by the Soil Science Society of America.