Soil nitrate level best measure of ryegrass nitrogen needs in Imperial Valley
Robert W. Hagemann, University of California
Carl F. Ehlig, University of California
Richard Y. Reynoso, University of California
California Agriculture 38(1):24-25.
Not available – first paragraph follows:
Annual ryegrass produces superior yields of hay or pasturage with excellent palatability, a protein content above 20 percent, and other desirable qualities. The new fertilizer technology provides a highly favorable economic return. However, the nitrogen fertilization rates required for highest yields may cause plant nitrate-nitrogen concentrations that are toxic to livestock.
Robert W. Hagemann is Farm Advisor, University of California Cooperative Extension, Imperial County; Carl F. Ehlig is Plant Physiologist and Agricultural Research Technician, respectively, USDA, ARS, Brawley, California. Richard Reynoso is Plant Physiologist and Agricultural Research Technician, respectively, USDA, ARS, Brawley, California.