Popular Leys Apart from the value of a particular species
or variety of grass or clover, it is a common belief, strongly corroborated by recent research, that the best and most economic method of restoring fertility to a too barren soil is to grow a mixture of clover and grasses for a year or two, and then plough the turf in. -The ley is to be the salvation of America. The problem is double. Denudation by wind is as deadly in both Ameuca and South Africa as exhaustion by continuous crop- ping ; but for both evils some form of mixed farming seems to be essential, as it is the only cure for weeds as well as for the exhaustion of essential chemicals and a surface humus. It was foretold years ago by Professor Robertson in Canada that weeds alone would compel mixed farming, and Canada obeyed his warning.
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