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Agronomy Journal Abstract -

Differences in Annual Clover Responses to Phosphorus and Sulfur1


This article in AJ

  1. Vol. 62 No. 4, p. 439-442
    Received: July 3, 1969

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  1. M. B. Jones,
  2. P. W. Lawler and
  3. J. E. Ruckman2



Many new varieties of winter annual legumes are now available for pastures in Mediterranean type climates. Since little work has been reported comparing the relative responses of these legumes to fertilization, 10 varieties of subclover, 6 of rose clover, 3 annual Medicagos, and 2 other annual clovers were grown in the greenhouse on a soil known to be deficient in P and S. There were four levels of P with S applied. The nil and highest P levels were repeated without S.

Yield differences between varieties and species were small where no P or S was applied. Responses to S alone were generally not significant, but responses to P only and P plus S varied significantly. Differences in response to P and S fertilization were as great among varieties of a given species as between species.

Highest yielding clover varieties tended to have lowest percentages of P and S. Differences in P and S uptake by the clover varieties were significant; however, uptake responses to fertilization tended to be relatively smaller than yield response differences, indicating that some varieties utilized absorbed nutrients more efficiently than others.

Response to fertilization apparently must be considered on a varietal basis rather than generalizing about species.

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