A Weed-Killing Formula The vogue of what is called green
manuring is advancing very rapidly in agricultuie, but the practice is rare, I think, in private gardens, perhaps to their loss. As I wrote, the other day, Americans hope to arrest the disastrous exhauslion of their soil by ploughing in grass and clover. Another method is suggested by a Scottish expert, and this might very well be copied in any big garden where a patch may be left without produce for a year or so. Where land is'-foul and barren—one or both—he recommends sowing the ground with tares, crushing the grown crop and spreading over it calcium cyanamide, a chemical that is increasing its reputation as a great fertiliser and weed-killer. The killed `crop is then ploughed in. Trials of the process show, I believe, admirable results. In some cases this green manuring is followed by a subsequent sowing and ploughing in of a ley of rye grass or what not. Green manuring in general certainly tends to produce healthy crops.
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