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This article in AJ

  1. Vol. 58 No. 1, p. 3-5

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Soil and Alfalfa Plant Characteristics as Affected by a Decade of Fertilization1

  1. Roger G. Hanson and
  2. John M. MacGregor2



The 10-year field study indicates annual top-dressings of K are needed to maintain a dense stand for high yields of quality alfalfa on sloping Port Byron silt loam. Total yield increases were related to total quantities of P or PK applied, with largest increases obtained from annual K with P top-dressings.

Contents of P and K in 10-year-old alfalfa were related to quantities of these elements applied. The P and K concentrations generally were highest in the third cutting and lowest in the second.

There appeared to be little movement of P below the surface 3 inches and little movement of K below 6 inches in Port Byron silt loam during the ten years of the experiment.

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