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Published in Soil Sci Soc Am J 23:388-391 (1959)
© 1959 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Runoff from Pasture Plots Analyzed by Fitting of Constants Technique1

L. E. Gard, W. C. Jacob and C. A. Van Doren2

ABSTRACT

Runoff data from erosion plots were analyzed by a technique known as analysis of variance by method of fitting of constants. This method permits nonorthogonal data to be handled in a reasonable fashion.

Data were collected from pasture plots at the Dixon Springs Experiment Station in Pope County, Illinois, during the period 1940 to 1951. Soil treatment reduced runoff during each of the four seasonal periods. Runoff was higher from severely grazed than moderately grazed plots during the grazing season (April through September) but not during the nongrazing season (October through March). As the seasons progress from January through September more intense storms are required to cause equal runoff.

Percent runoff generally increased with increases in antecedent moisture. Values obtained for the regression of runoff on amount of rainfall indicate that there are too many uncontrolled variables for ratios to be useful.

NOTES

1 Joint contribution from the Soil and Water Conservation Research Division, ARS, USDA, and the Illinois Agr. Exp. Sta., Urbana. Presented before Div. VI, Soil Science Society of America, Nov. 15, 1956, at Cincinnai, Ohio.

2 Assistant Professor of Agricultural Research and Professor of Agronomy, University of Illinois; and Soil Scientist, Eastern Soil and Water Management Branch, ARS, USDA, respectively.

Accepted for publication May 11, 1959.






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