. Dry farming in western Canada . Fig. 81.—Canada Thistle. a typical "cieeping-rooted" perennial. The Sow Thistle which is some- what similar in habit is more difficult to control in the Red River Valley. is essential whether early cultivation has been given or not, and (2) that the use of biennial crops like Winter rye and sweet clover which aid in the control of annual weeds, only foster the development and spread of bien- nial weeds. In some seasons some biennial weeds will germinate, and like annuals, produce seed in the same year. Fall cultivation v\ill not control these. The us
. Dry farming in western Canada . Fig. 81.—Canada Thistle. a typical "cieeping-rooted" perennial. The Sow Thistle which is some- what similar in habit is more difficult to control in the Red River Valley. is essential whether early cultivation has been given or not, and (2) that the use of biennial crops like Winter rye and sweet clover which aid in the control of annual weeds, only foster the development and spread of bien- nial weeds. In some seasons some biennial weeds will germinate, and like annuals, produce seed in the same year. Fall cultivation v\ill not control these. The usual cultivation given to control other annual weeds will, however, take care of them. 181. The Control of Perennial Weeds.—The native quack grass ^gropjron glaucnm), is a typical peren- nial wefed in many parts of the West. It is less difficull
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdryfarm, bookyear1921
