Browse on keywords: erosion OR
Search results on 12/12/18
4884. Northwest Regional Council. 1940. Soil conservation in outline.. .
A general, but quite good, treatment - discussion of the condition in 1940.
2918. Idaho Agr. Expt. Sta.. 1950. Annual Report. Id Agr. Expt. Sta. Bull. #280.
T: hay yields, economics
187. Allamaras, R.R., S.C. Gupta, J.L. Pikul and C.E. Johnson.. 1980. Soil erosion by water as related to management of tillage and surface residues.. USDA-ARS, Oakland, CA..
Soil erosion by water was estimated for combinations of tillage and residue handling, terracing, and contouring. The Universal Soil Loss Equation was applied for conservation planning. Slope steepness primarily determined which combination of management practices was needed. Erosion could not be held below tolerance values for wheat-fallow sequences on slopes exceeding 20%. T: Distribution of K values within cropland of study area. Cover and management (C) values for study area. Tillage operations in wheat-fallow rotation, and associated reduction in surface residue.
231. Allmaras, R.R., C.L. Douglas and K. Ward. 1976. More infiltration, less runoff and evaporation.. OR Agr. Expt. Sta. Special Report 459.
302. Allmaras, R.R., S.C. Gupta, J.L. Pikul and C.E. Johnson. 1979. Tillage and plant residue management for water erosion control on agricultural land in eastern OR.. Effects of tillage and crop residue removal on erosion, runoff, a.
Tillage and plant resiude management for water erosion control on agricultural land in eastern OR.
1819. Elliott, L.F. (ed.). 1987. STEEP - Conservation concepts and accomplishments.. Washington State Univ. Publ., 662pp..
A compilation of 48 papers covering: tillage and plant maagement; erosion and runoff predictions; plant design; pest management; socio-economic; integrated systems; technology transfer for cropping systems; 22 technical notes. T: many
2928. Idaho Agr. Expt. Sta.. 1949. Annual report.. ID Agr. Expt. Sta. Bull. #276.
Sweetclover maintained OM levels, slight loss in W-P; N fertilizer reduced OM losses where straw was removed.
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.
2163. George, G.O.. 1981. Best management practices (BMP) demonstration and evaluation project.. OR Agr. Expt. Sta. Special Report #623, p.43-44.
In 1979, the program was expanded to evaluate recognized Best Management Practices (BMP's) and demonstrate their impacts on water quality. All terraces will reduce erosion and sediment and improve water quality, but may not bring soil losses within tolerance limits. Stubble mulch and conservation tillage will reduce water pollution by keeping erosion from initiating during low rainfall or runoff conditions. Conservation practices are more effective in keeping soil losses within established tolerance limits than terraces. They are not as effective in removing sediment pollutants as the terrace once sediment is picked up by the runoff water. Grassed waterways and stream buffer strips reduce sediment delivery to streams, but have little or no impact on in-field erosion. Where combinations of practices were utilized and measurements were made there was decidedly less erosion and, therefore, less sediment for water pollution.
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.