Improving Crop Management and Farm Profitability: New Approaches for Advisory Services1
- R. C. Ward,
- A. D. Halvorson and
- K. Wisiol
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Copyright © 1987. . Copyright © 1987 by the Soil Science Society of America, Inc. American Society of Agronomy, Inc. 5585 Guilford Rd., Madison, WI 53711 USA