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The contamination of barley grains by mixing of volunteer wheat grain causes a serious problem in barley production in the alternating cropping system between barley and wheat.Effect of several kinds of soil applied herbicide and calcium cyanamid on germinated seeds of volunteer wheat was investigated in field experiments.CAT, linulon and alachlor had little inhibitory effect while trifuralin incorporated with the soil greatly inhibited the growth of volunteer wheat during the summer. But thus herbicides had little inhibitory effect in autumn.Calucium cyanamid incorporated with the soil promoted the emergence of volunteer wheat during the summer, and consequently the amount of volunteer wheat was slight in autumn.Calucium cyanamid is thus quite useful for reducing the production of volunteer wheat during the autumn.

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Studies on the Relation between Persistence of Volunteer Cereals and Cropping System in Upland. V Control of volunteer wheat by soil applied herbicide and calcium cyanamide.