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Synopsis: Yields of corn were consistently depressed by sub-soiling when soil moisture was at field capacity. Rotation substantially corrected this in about 4 years. Yields of corn were closely related to water stability of aggregates and to soil bulk density measurements.
2 Professor and Research Specialist in Farm Crops, New Jersey Agr. Exp. Sta.; formerly project supervisor, Soil Conservationist, now Research Administrator Soil Science, State Exp. Sta. Div., ARS, USDA; formerly Research Assistant in Soils, now Assistant Professor in Soils and Plant Nutrition, University of California; and Soil Conservationist, ARS, USDA; respectively.
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