Abstract
Experiments to determine tithe effect of a soil cap on the growth of a lettuce crop are described. The cap, which was formed by rain or by the application of irrigation water after the plants had become established, had no effect on crop yield in any of the experiments. Measurements of gaseous diffusion rates through capped and uncapped soil surfaces suggest that a dry cap is unlikely to have any effect on soil aeration, whereas a wet cap may interfere with aeration especially on soils having a low percentage air space.
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