Nitrogen fertilization increased cotton yield in a series of experiments designed to determine the kind of fertilizer and—specifically—the amount of nitrogen necessary for maximum production on soils of the San Joaquín Valley.

Farm Advisors J. O. Hoyt, Fresno; O. D. McCutcheon, Kings; G. V. Ferry, Kern; C. E. Johnson, Madera; A. George, Tulare; Extension Cotton Specialist Marvin Hoover, and Associate Agronomist, U.S.D.A., E. G. Smith, Shafter, co-operated in the trials reported here