Abstract
IN preliminary work1 evidence has been obtained of the accumulation of notable quantities of nitrate nitrogen on a bare soil. Under a grass mulch this effect is not shown; in fact, an initially high nitrate status is depressed by the application of a grass mulch. Both the rise in nitrate content on a bare soil and the fall under a mulch take place on the onset of rains. A soil newly opened from grass has a low nitrate status2 and there is a time-lag of several weeks before a build-up of nitrate occurs.
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References
ap Griffith, G., and Manning, H. L., Trop. Agric. (in the press).
ap Griffith, G., E. African Agric. J., 14, No. 4, 187.
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AP GRIFFITH, G., MANNING, H. Nitrate Accumulation in Uganda Soils. Nature 165, 571 (1950). https://doi.org/10.1038/165571a0
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DOI: https://doi.org/10.1038/165571a0
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