Browse on keywords: erosion OR tillage
Search results on 06/22/18
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.
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
2294. Greenwalt, R.N., J.L. Pikul Jr. and J.F. Zuzel. 1983. Soil frost penetration under conventional and conservation tillage.. OR Agr. Expt. Sta. Special Report #680, p.20-23.
This research evaluates the effects of surface crop residues and tillage practices on overwinter soil temperatures and soil frost penetration. Soil frost penetration was significantly greater in the fall-plowed than in the no-tilled winter wheat plots because surface residues in the no-till treatment acted as a thermal insulator creating warmer soil temperatures when compared to the bare soil surface of the fall plow plot. Frost penetration was three times greater in depth and frozen soil layers were present twice as long in the conventional tillage system as compared to the conservation tillage system. Because infiltration rates can be greatly reduced when frozen soil layers are present, nearly all precipitation on frozen soil runs off or evaporates. Those tillage management techniques which leave adequate crop residues on the surface should be considered as a means to reduce or eliminate soil losses caused by soil erosion. T: Depth of soil frost penetration in fall-plow and no-till plots. Comparison of soil temperatures between the fall-plow and no-till treatments.
5030. Papendick, R.I.. 1984. Soil conservation and management in the Palouse. p. 234-244.. IN: B.R. Bertramson (ed.). History of the Dept. of Agronomy and Soils, WSU, Pullman, WA.
An historical overview.
5273. Pikul, J.L., J.F. Zuzel and D.E. Wilkins. 1988. Measurement of tillage-induced soil macroporosity.. Amer. Soc. Agric. Engr., Paper No. 88-1641.
An improved method to impregnate soil with paraffin was used to study tillage induced macroporosity. Macroporocity and water infiltration measurements, conducted in March, attest to the overwinter stability of macropore structure on both the chisel and Praplow tillage treatments. Water infiltration was least on the no-tillage treatment.
5899. Rodman, A.W.. 1988. The effect of slope position, aspect, and cultivation on organic carbon distribution in the Palouse.. MS Thesis, Dept. of Agronomy & Soils, WSU, Pullman, WA.
Soil organic carbon (OC) was studied at 4 sites, native and cultivated. At the native site aspect had the greatest influence on OC levels. At the cultivated site OC distribution is due to water and tillage erosion. All topsoil had been eroded from south slopes. Perennial grass rotations had added OC above and below the surface while reducing OC loss from erosion and oxidation. Strip cropping and uphill plowing resulted in a greater depth of OC. T: Average surface organic carbon values by slope position.
6684. Stephens, D.E.. 1944. Effect of tillage and cropping practices on runoff, erosion, and crop yields in the wheat growing areas of Washington, Idaho, and Oregon.. USDA-SCS. Conservation practices on wheat lands of the Pacific Northwest..
An excellent summary of the dryland experiment station research in WA, ID and OR. Describes research on stubble mulching, tillage implements, crop rotations, fallow, etc. The use of sweetclover or alfalfa-grass were encouraged. T: yield, runoff, soil loss by tillage, rotation, fertilizer.
6946. University of Idaho. 1977. Priorities for erosion - sedimentation research in the Pacific Northwest.. ID Agr. Expt. Sta. Misc. Series #37.
Describes the background, current research and future needs, related to hydrology and erosion, soil and crop management, and socio-economic concerns.