WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Saturday, January 20, 2018

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1149. Busacca, A.J., D.K. McCool, R.I. Papendick and D.L. Young. 1985. Dynamic impacts of erosion processes on productivity of soils in the Palouse. p. 152-169.. IN: ASAE. Erosion and soil productivity. (Conf. Proc., Dec. 10-11, 1984).
Tillage erosion on hilltops for a single plowing results in about a 29 T/ha loss, which is similar to that of water erosion. At these rates all of the topsoil will be removed from the Naff, Garfield, and Risbeck soils over a 50 year period; 1/3 - 2/3 of the topsoil will be removed from the Walla Walla, Palouse, and Thatuna soils over the same 50 year period. Crop yields may be reduced by 25%. Assuming present technology, yields at zero topsoil will be 2.4 T/ha and 1.8 T/ha for Naff soil on Class III and IV sites respectively. T: Water erosion estimates. Predicted wheat yields for varying topsoil depths by soil series and capability class. Topsoil depth-yield response functions.

5003. Papendick, R.I., D.L. Young, D.K. McCool and H.A. Krauss.. 1985. Regional effects of soil erosion on crop productivity - the Palouse area of the Pacific Northwest. p. 305-320.. IN: R.A. Follett and B.A. Stewart (eds.). Soil Erosion and Crop Productivity..
Most of the cropland soils of the Northwest have had productivity losses from erosion. Erosion rates will accelerate in the future if unchecked. Major changes in tillage and cropping are needed to sustain soil productivity. This study covers: wheat yields and technology advances; relationship of yields to topsoil depth; technological impacts on productivity; formulas for assessing the impact of erosion on crop productivity; impact of erosion on wheat yields. T: Average wheat yields and cumulative soil erosion for Whitman Co. Additive versus multiplicative technology impact on crop yields for different topsoil depths. Response functions for wheat yields and topsoil depth, 1950's and 1970's. Topsoil depths and long-term erosion rates in Whitman Co. Wheat yields for land capability classes of the Palouse projected for 1950 - 2000. Maximum potential wheat yields assuming present technology with and without erosion. Projected reduction in wheat yields for each centimeter of topsoil lost.

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