Browse on keywords: erosion soil quality
Search results on 03/19/18
35. Anon.. 1949. Grasses and legumes for soil conservation in the PNW.. .
An excellent treatment of over 60 species - detailed descriptions. T: maps and photos.
1639. Dormaar, J.F., C.W. Lindwall, and G.C. Kozub. 1988. Effectiveness of manure and commercial fertilizer in restoring productivity of an artificially eroded dark brown chernozemic soil under dryland condit. Can. J. Soil Sci. 68:669-679.
1648. Dosdall, N.L.. 1985. The extent and use of the agricultural land evaluation and site assessment system.. MS Thesis, Washington State Univ., Pullman.
Description and evaluation of use of the agricultural land evaluation and site assessment system.
1987. Fireman, M.. 1945. Effect of sodium nitrate and ammonium fertilizers on the permeability of western soils.. .
Experiments on 51 western soils. Sodium nitrate reduced permeability 41-86%. Ammonium nitrate and ammonium sulfate also decreased permeability, but to a lesser extent. T; Permeability tests; variations in permeability.
2274. Greenland, D.J.. 1977. Soil structure and erosion hazard.. Soil Conserv. and Management in the Humid Tropics..
The structure of surface soil is usually given most attention in relation to soil erosion, because it is most subject to deterioration under raindrop impact, and due to agricultural practices its contition can be readily altered. However, subsoil structure is also important, as infiltration in a water-saturated profile is determined by the horizon of lowest conductivity.
2406. Hanley, Paul (ed.). 1980. Earthcare: Ecological agriculture in Saskatchewan.. Earthcare Information Centre.
A well-written text covering all aspects of biological farming in the prairie region of Saskatchewan. Practices apply to small and large farms. Includes reports from selected farms. References at the end of chapters.
3210. Bhatti, A.U.. 1990. Spatial variability and geostatistical estimation of soil properties and wheat yield on eroded lands in the Palouse region.. Chpt. 3, PhD. Dissertation, Dept. of Agronomy & Soils, Washington State Univ., Pullman, WA 99164.
Spatial variability of organic matter, soil P, and wheat yields was studied using classical statistical and geostatistical approaches on two commercial wheat farms in the Palouse region of eastern Washington. Geostatistics indicated strong spatial relationship of soil properties and wheat yields with a range of influence of 50-200 m. The two sites differed greatly in spatial patterns due primarily to differences in topography and the extent of erosion and topsoil loss. As a consequence of topsoil loss and reductions in organic matter, it was demonstrated that spatial patterns in yield and soil phosphorus were strongly correlated with organic matter patterns. Remote sensing of soil organic matter and the use of geostatistics offers a way to quickly assess spatial patterns in grain yield and available phosphorus.
3220. Bhatti, A.U.. 1990. A comparison of criteria for dividing eroded wheat fields into different management zones.. Chpt. 2 PhD. Dissertation, Dept. of Agronomy & Soils, Washington State univ., Pullman, WA 99164.
The study examined possible criteria for dividing dryland grain fields into management units for variable fertilizer (and other input) management. Criteria evaluated included fertility status, organic matter content, available water content, soil pH, erosion class, and wheat yield. Erosion class and soil pH were not satisfactory, but the other criteria were acceptable since they all allowed division of the field into three zones with significantly different grain yields as well as different nitrogen fertilizer rates (ranging from 0 to 90 kg N/ha). For each criterion, the field-averaged rates of recommended N were about 35 kg/ha, which is much lower than the grower's typical uniform application of 73 kg N/ha. Generally, the lowest N rates were recommended for eroded hilltops where productivity was low. The two best criteria appeared to be soil organic matter content and grain yield, as they accounted for P deficiency in the eroded zones. Remote sensing can now assess spatial patterns of organic matter on bare soil, thus providing a quick and easy way to delineate production zones.
3348. Jaffri, M.Z.. 1956. Effect of farming systems on soil losses, organic matter changes, and trends in productivity of land in the Palouse wheat-pea area.. M.S. Thesis, Washington State College, Pullman, WA.
An excellent study to determine the effect of cropping systems, tillage practices, fertilizers, and conservation practices on soil loss and soil organic matter changes, and to future soil productivity. T: many.
3742. Kramer, J. and J.E Weaver. 1936. Relative efficiency of roots and tops of plants in protecting the soil from erosion.. Dept. of Conservation Bull. 12, Univ. Nebraska, Lincoln, NE.