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  • Phosphorus fertilization of late-planted winter wheat in no-till fallow : applied research in the low-precipitation zone 

    Lutcher, L. K. (Lawrence K.) (Corvallis, Oregon : Oregon State University. Extension Service.; Pullman, Washington : Washington State University. Extension.; Moscow, Idaho : University of Idaho. Extension.; Washington, D.C. : U.S. Dept. of Agriculture., 2012-04)
    This research showed a consistent grain yield response to P fertilization at sites where the initial soil test P level was less than 12 ppm. At sites where the initial soil test P level was greater than 12 ppm (and less ...