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This article in SSSAJ

  1. Vol. 29 No. 6, p. 752-755
    Received: Apr 22, 1965



Effects of Crop Residue, Soil Temperature, and Sulfur on the Growth of Winter Wheat1

  1. B. A. Stewart and
  2. C. J. Whitfield2



The interrelations of wheat straw, fertility levels, and three soil temperatures on the growth and nutrient status of winter wheat were investigated. When only N and P were added, the decomposition of straw incorporated with the soil immobilized a portion of the available S and caused a reduction in yield. When S was added with the N and P, the incorporation of straw had no effect on yield.

Ratios of total N to total S and protein N to protein S were determined on the wheat tissue. Indications are that a total N/S ratio of these elements can be used as a very good criterion in assessing the S status of plants. A total N/total-S ratio of about 17:1 or less suggests that S is not limiting, while a greater ratio points out that S is limiting the formation of protein. The N-S relation in soil organic matter is also discussed in relation to its abilities and limitations in supplying S for plant growth.

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