Controlling Growth of Weeds.Sulphuric acid spray as a method of controlling the growth of weeds in fields of grain is gaining ground in the United States Tests covering several years and several thousand acres of grain fields in California have demonstrated the effectiveness of this method During the present season more than 6000 acres are being kept free from weeds by spraying with solutions of sulphuric acid which kill weeds but do not ijure the growing grain.This is a meagre beginning when in California alone there are more than half a million acres that could be benefited and when the vast grain fields of the midwest and the Pacific Northwest have not yet been touched.In France the treatment is already applied to more than 500,000 acres and its use is growing in England and on the Continent.The California development includes testing new,more efficient types of cover larger areas more effectively.(Scientific American ,September 1937).
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Tamil Nadu Agricultural University
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