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This article in SSSAJ

  1. Vol. 52 No. 5, p. 1403-1407
    Received: Dec 21, 1987

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Distribution of Sulfur Fractions in Soil as Influenced by Management of Organic Residues

  1. S. D. Castellano and
  2. R. P. Dick 
  1. Department of Soil Science, Oregon State Univ., Corvallis, OR 97331



There is increasing concern about the long-term effects of crop management on soil properties that may be affecting soil productivity. Consequently, a study of the long-term (55 yr) effect of organic residue and inorganic N applications on the distribution of S fractions (inorganic sulfate, C-bonded, ester sulfate, residual, and sulfolipid S) in a Typic Haploxeroll under a wheat-fallow (Triticum aestivum L.) rotation was undertaken. The biennial treatments were: (i) straw (control), (ii) straw plus fertilizer (+N) (34 kg N ha−1 from 1931–1966 and 90 kg N ha−1 from 1967–1986), (iii) straw plus 2.24 Mg ha−1 of pea vine residue (PV), and (iv) straw plus 22.4 Mg ha−1 of strawy manure (M). There was a significant treatment effect (P < 0.01) with the M treatment having 7 to 41% greater total S, and 9 to 22% greater ester sulfate hydriodic reducible S), and nearly two times more C-bonded (Raney-Ni reducible S) and sulfolipid S than the remaining treatments. The lowest level for total S occurred in the +N treatment (114 vs. 161 mg S kg−1 soil in the M treatment). A significantly lower level of residual S (nonreducible) for the +N treatment suggests that the addition of inorganic N causes a depletion of S from the residual pool. On a biennial basis, treatments receiving only straw (control and +N) had net inputs (amount of S added with residue minus S removed in grain) of −0.51 and −1.72 kg S ha−1, respectively, and PV and M treatments had net S inputs of 1.92 and 31.05 kg S ha−1, respectively. Calculation of the coefficient of simple determination (r2) among S fractions and other soil properties showed that whereas organic C and total N had a high r2 value (0.81), total S had a low r2 (0.29) with organic C and was more closely related to total N (r2 = 0.55). The r2 values among the organic S fractions were quite low (<0.23), except for sulfolipid S and C-bonded (r2 = 0.45).

Oregon Agric. Exp. Stn. Journal no. 8379.

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