Effect of pH,organic matter content and nitrate on the evolution of ethylene from soils |
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Authors: | Gillian Goodlass K.A. Smith |
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Affiliation: | Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JG, Scotland |
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Abstract: | The evolution of C2H4 from soils was stimulated by air-drying, and still more by oven-drying at 105°C. The quantities evolved were closely correlated with organic matter content, with no significant difference in this relationship between grassland and arable soils, or between topsoil and subsoil. In arable soils only, the quantities of C2H4 also increased significantly with decreasing pH. No significant relationship could be found between NO3? concentrations in fresh soils and the quantities of C2H4 evolved, but for air-dried soils (arable only) there was a significant decrease with increasing NO3?. Artificial addition of NO3? only partially inhibited the evolution of C2H4, even at concentrations an order of magnitude higher than those found in the field. At normal soil concentrations the only effect of NO3? seems likely to be a short delay in the achievement of the maximum C2H4 concentrations. |
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