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Proceedings
THE EFFECT OF STRAW REMOVAL AND DIFFERENT ESTABLISHMENT
SYSTEMS ON SOIL FERTILITY LEVELS IN ANNUAL RYEGRASS SEED FIELDS
M.E. Mellbye and W.C. Young III
Department of Crop and Soil Science, 131 Crop Science Bldg.,
Oregon State University, Corvallis, Or, USA 97331-3002
A three-year study of crop residue and establishment systems on two annual ryegrass fields in Oregon, USA, was completed in 1997. This report summarizes the effects of straw removal and conventional till versus no-till planting systems on soil chemical properties. Straw removal by baling decreased soil K levels compared to flail chopping, but did not affect soil pH, Ca, Mg, or P. Baling also resulted in a small decline in soil organic matter, but did not affect seed yields. No-till methods of establishment resulted in pH, organic matter, and nutrient stratification. Seed yields were greatest on conventionally tilled plots.
Keywords: Annual ryegrass; no-till; field burning; volunteer.