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This article in AJ

  1. Vol. 59 No. 2, p. 197-199
     
    Received: Oct 7, 1966


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doi:10.2134/agronj1967.00021962005900020023x

Toxicity of Decomposing Crop Residues to Cotton Germination and Seedling Growth1

  1. Christian A. Megie,
  2. R. W. Pearson and
  3. A. E. Hiltbold2

Abstract

Abstract

Toxicity of un-ionized ammonia was the primary reason for inhibited germination and reduced growth of cotton seedlings following incorporation of plant residues in a sandy loam soil. The accumulation of ammonia in toxic amounts resulted from increased soil pH and ammonium N content, whicn were proportional to the organic N content of the residues. Plant growth decreased sharply with increasing ammonia and levels above about 10 ppm were lethal.

Under sterile conditions, 1:50 plant-water extracts did not reduce germination, but with the onset of microbial decomposition, extracts of all materials were highly toxic. At concentrations above 1 :50, alfalfa extracts reduce dradicle elongation even under sterile conditions, indicating the presence of a toxic constituent, possibly saponin.

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