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Value of Manure on an Irrigated Calcareous Soil¹

ABSTRACT

Each ton of high quality manure was equivalent to 22 lb of nitrogen from ammonium nitrate as measured by equivalent grain sorghum (Sorghum vulgare Pers.) yields over a 4-year period. Phosphorus level of the soil by the Bray and Kurtz no. 1 procedure was increased by 1 ppm for each ton of applied manure. Commercial phosphorus fertilizer did not increase grain yields. Total N content of the surface soil was increased by all manure treatments. Nitrogen uptake by grain was correlated with relative yield of grain. The forage portion of sorghum appeared to take up N in excess of needs for maximum grain yield.

¹ Contribution No. 73, Garden City (Kansas) Branch, Kansas Agr. Exp. Sta., Kansas State University, Manhattan.

² In charge of Soil Fertility Research and Superintendent, respectively, Garden City Branch, Kansas Agr. Exp. Sta., Garden City.

Received for publication August 28, 1964. Accepted for publication January 6, 1965.