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6720. Stephenson, R.E.. 1941. Humus for Oregon soils.. OR Agr. Expt. Sta. Circ. #143.
Four tons of stable manure were equal in value to 5 tons of green manure plowdown. The humus renewal of 1 yr legume sod equaled the humus lost during 1 yr row cropping. Plant material should never be burned. Fresh additions of organic matter stimulate root developement. Alfalfa for soil building - 2/3 of roots left below plow layer. Pea green manure raised OM content by 0.2% after 4 crops. Prairie grass adds 4T/ac roots in 4" of soil. T: organic matter levels and changes.