WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Sunday, July 22, 2018

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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.

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.

5353. Powell, M.L. and E.L. Michalson. 1985. An evaluation of best management practices on dryland farms in the lower portion of the Upper Snake River Basin of southeastern Idaho.. ID Agr. Expt. Sta. Bull. #639.
Where annual precipitation is <16", each inch of topsoil lost may reduce wheat yields 1 to 3 bu/ac. Four BMP's are examined: residue management, terracing, strip cropping and grass waterways. Terraces increase costs ~10%. WW (25%) - fallow (25%) - spring barley was most profitable rotation for all farm sizes. Minimum till was first choice for small and large farms, with strip cropping for medium farms. Maximum use of BMP's reduced soil loss 61% to 2.3 T/ac., with a reduction in net returns averaging 36%.

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