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Fig. 2. Comparison of establishment methods, amounts postharvest straw returned to fields, and times from planting on estimated annual soil erosion amount for three perennial grasses grown for seed in western Oregon. Soil erosion is estimated by the Revised Universal Soil Loss Equation (RUSLE 1.06c software). The horizontal lines labeled CT LR and DS HR indicate the average annual soil erosion amount for a monoculture grass seed crop using conventional tillage–low residue and direct seeded–high residue treatment combinations, respectively. Indicated by the arrow is the average annual reduction in soil erosion from implementing DS HR. Note: the scale difference for creeping red fescue compared with the two other grasses. SY, seed year.
