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11346. Boerboom, C. and F.L. Young. 1991. Integrated crop management for cereal/legume production in the Palouse.. Technical Report 91-3, Dept. of Crop and Soil Sciences, Washington State Univ., Pullman.
This report summarizes six years of a field-scale integrated crop management experiment near Pullman, WA. The study focused on weed management intensity, residue levels for conservation compliance, and economic returns. Two crop rotations, two tillage systems, and three weed management levels were used. Plant diseases, insect pests, soil microbiota and earthworms were also monitored. The study will continue several more years. It took about four years for each treatment to stabilize, pointing out the need for long-term studies. Over time, the three year rotation with conservation tillage appeared most profitable and in compliance with residue levels. The low weed management level was seldom justified by weed control, yield, or profitability considerations. Moderate to high weed management were often the most profitable, although a reduction in the soil reserve of weed seeds with high management might allow periods of less intensive management in the future.