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6583. USDA Soil Conservation Service. 1974. Soil conditioning rating indices for major irrigated and non-irrigated crops grown in the Western U.S.. Conservation Agronomy Technical Note No. 27.
This document presents a rating system to judge how various cropping systems affect soil condition over time. It assigns numerical values to various practices and totals them over a rotational sequence, with either a +, -, or neutral outcome. It is not a method for determining erosion. The concepts presented are helpful in assessing "soil quality" for cropping systems, both irrigated and dryland.
11308. Coutts, G.R. and R.K. Smith. 1991. Zero Tillage Production Manual.. Manitoba-North Dakota Zero Tillage Farmers Association, Brandon, Manitoba.
The manual contains a mix of research results and grower experience with no-till management in the Northern Plains. A calendar of operations is included. In a four-year Manitoba study, average net returns per acre for no-till and minimum till were 130% and 77% higher, respectively, compared to conventional tillage.