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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