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Monday, June 18, 2018

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2918. Idaho Agr. Expt. Sta.. 1950. Annual Report. Id Agr. Expt. Sta. Bull. #280.
T: hay yields, economics

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

1086. Brooks, R.O. and E.L. Michalson. 1983. An evaluation of BMP's in the Cow Creek watershed of Latah County, Idaho.. ID Agr. Expt. Sta. Research Bull. #127.
Eight BMP's were evaluated. Major farm income loss occurred when soil erosion was reduced below 6 T/ac./yr. This required minimum tillage and a rotation change from wheat-barley-fallow to wheat-barley-peas.

4500. Michalson, E.L. and S. Berglund. 1980. Economics of the 5-point program in Latah County.. ID Agr. Expt. Sta. Research Bull. #113.
5-point erosion control strategy; assesses the economic costs of adopting the program, and the resulting levels of soil loss.

5389. Prato, T., H. Shi, R. Rhew, and M. Brusven. 1989. Soil erosion and nonpoint-source pollution control in an Idaho watershed.. J. Soil Water Cons. 44:323-328.
Offsite economic damage from cropland erosion has been estimated at between $2-6 billion. This study modelled erosion reduction, improvements in surface water quality, and impact on net returns for a watershed near Lapwai, Idaho, using a 1000 acre wheat-pea farm as the prototype. It concluded that total net farm income in the watershed increased 1.5% when average erosion was reduced to T. The study used a GIS system to model the outcomes of farm practice choices. Soil erosion was calculated with the USLE. Water quality impacts were estimated with AGNPS. Eleven resource management systems were modelled for each of the 16 farms in the watershed. The results indicate that minimum tillage with either cross-slope farming or contour farming is the most economically efficient resource management system for reducing erosion. Averaged over all farms, such a system increased annualized net returns by $1.05/ac and $1.38/ac, and reduced erosion by 5.2 T/ac/yr and 5.6 T/ac/yr for the min-til cross-slope and min-til contour systems respectively. To achieve a 70% erosion reduction (equalling 2T), no-till and permanent vegetation were the required systems. Net farm income increased 1.5% when total erosion was reduced 40%, and decreased 35% when erosion was reduced 70%. Total net farm income declined rapidly beyond 40% erosion reduction. Figure 5 shows net income versus erosion reduction.

6776. Taylor, M.C. and V.W. Baker. 1947. Economic aspects of soil conservation in the Palouse wheat-pea area.. WA Agr. Expt. Sta. Bull. #494.
The objective of this study was to measure the effect of the conservation program on farm income during the sixth year of a 6-yr period. The purpose was to evaluate the economic effects of the program currently recommended for the area and to contribute information for the improvement of conservation planning. It was found that there was no significant relationship of current farm income to the total conservation inputs over a 6-yr period. There was no significant or consistent relationship of crop yields or labor and machinery requirements to conservation inputs. It was noted, however, that by slight shifts in land use and farm organization the higher conservation score farmers were able to maintain net incomes comparable to those of other farmers. T: Percentage of crop land in grass-legumes on 69 sample Palouse farms by conservation score groups, 1941 to 1946. Percentage of crop land in sweetclover used as green manure crop on 69 sample Palouse farms by conservaton score groups, 1941 - 1946.

6957. USDA. 1978. Palouse cooperative river basin study.. SCS, FS, ESCS - USDA.
Excellent summary of soil erosion problem and possible management approaches in the Palouse; extensive data on land use, soil erosion, future scenarios; history of agriculture in the area; bibliography.

7414. Walker, D.J.. 1990 Jan.. Soil Loss Damage Model. STEEP Annual Review, Moscow, ID.
A PC computer model for estimating soil loss damage over time was demonstrated. The model indicates at what point in time it becomes "profitable" to switch to a conservation tillage or management system. A penalty for lost productivity due to soil erosion is calculated and carried forward a specified number of years. Walker indicated that the yield penalty for peas under conservation tillage is 14%. A sample printout shows all the input data and the topsoil depth, current profit advantage, erosion cost, and net value for each year of the projection.

7424. Walker, D.J. and D.L. Young. 1982. Technical progress in yields - no substitute for soil conservation.. ID Agr. Expt. Sta. CIS #671.
Technological progress increased yield damage from erosion; higher yield reduction with successive erosion; yield damage from conventional tillage in wheat-pea rotation estimated at $8 for one year; no assurance that technology will continue to offset erosion - induced yield losses; leveling off yields in the last several years. T: erosion and yield change; technology and yield.

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