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Search results on 12/12/18
1699. Douglas, C.L. and P.E. Rasmussen. 1985. Rill erosion effect on wheat yield.. OR Agr. Expt. Sta. Special Report 738, p. 12-13.
Rill erosion does have a detrimental effect on grain yield when it occurs within the growing crop. Even small rills appear to cause a yield loss, apparently because of decreased plant survival. The estimated yield loss, if a rill occurred every 10 ft across a slope, would be 7 bushels of grain per acre. T: effect of aspect and slope steepness on grain yield and tiller density. Winter wheat yields and tiller density in rill and nonrill areas.
2173. George, G.O., S. Lund, R.R. Allmaras and G. Fischbacher. 1979. Monitoring terrace effectiveness in controlling soil erosion and. OR Agr. Expt. Sta. Special Report #547, p.39-42.
During the summer of 1978, one field in each of five counties in the Columbia Basin dryland was selected for monitoring of runoff, erosion, and sedimentation from October 1, 1978 to May 1, 1979. The study has verified that terraces will reduce soil erosion significantly in the Columbia Basin dryland wheat area of Oregon and consequently will reduce stream pollution from sediment. T: Some measured soil erosion in the 1977-78 winter in eastern Oregon.
6837. Thomas, H.L.. 1943. Soil erosion on wheat yields in eastern Oregon.. OR Ag. Exp. Sta. Circular #157.
The study was based on 989 soil observations at two locations during 1939-41. The direct effect of topsoil loss (occurring at the rate of 1 in. per 8 yrs) is shown in terms of wheat yields. It is projected that at that rate the area would be non-productive in 100 yrs. The economics of the situation are analyzed and it is estimated that farmers could invest $2-5/ac. on erosion control and receive the initial invesment plus 4% within 100 yrs. A combination of conservation practices which could be used are described. T: The rate of soil erosion. The effect of slope on the rate of soil erosion. Relation between total depth of soil and wheat yield. Relation between depth of topsoil and yield of wheat. Loss of soil and its effect on wheat yields during 50 yrs of cultivation . Decrease in income from erosion. Value of wheatland adjusted for soil erosion. Effect of a sweet clover rotation on water runoff and erosion.