An introduction to agriculture . he ground lie a weekor two after the seed bed has been prepared and beforeit is seeded, so that the weeds may have an opportunityto sprout. They may then be killed by harrowing thefield just before the crop is planted. This gives the 138 AN IiNTEODUCTIOIsr TO AGRICULTURE crop a chance to start before a new lot of weeds springup. Biennials and How to Kill Them.— Some commonbiennial weeds are: — bull thistle burdock mallow meadow salsify teasel mullein wild parsnipwild carrot It is rather more diffi-cult to get rid of biennials,than of annuals for eventhough they
An introduction to agriculture . he ground lie a weekor two after the seed bed has been prepared and beforeit is seeded, so that the weeds may have an opportunityto sprout. They may then be killed by harrowing thefield just before the crop is planted. This gives the 138 AN IiNTEODUCTIOIsr TO AGRICULTURE crop a chance to start before a new lot of weeds springup. Biennials and How to Kill Them.— Some commonbiennial weeds are: — bull thistle burdock mallow meadow salsify teasel mullein wild parsnipwild carrot It is rather more diffi-cult to get rid of biennials,than of annuals for eventhough they are mowed off,the roots of biennials areleft in the ground and theymay send up a stem to pro-duce seeds the second should never be al-lowed to go to seed, andwhere they occur on smallpatches as lawns, theyshould be killed by cuttingoff the plants just belowthe ground. Perennials and How toKill Them.—The 2^reat Ohio Agricultural Exiyeriment Sta- niaioritv of trOublcSOmetion Bulletin l/o j » weeds are QUACK-GRASS Among; these mav be mentioned:- Blue vervain Canada thistle catnip dandelion oxeye daisyquack grasssorrelwild garlic wire-grassplantaincurled dockJohnson grass PLANT ENEMIES 139> Perennial weeds are the most ditiieult of all weedsto destroy, because both the tops and the roots must bekilled. As with the other two classes, seed productionshould be prevented. The roots or underground stemsshould be plowed up or dug up, and either exposed to thesun of summer and the frost of winter, or raked off andburned. The roots may sometimes be starved by pre-venting any green part to live above the ground. Eorexample, dandelions in a lawn may be killed by cuttingoff the plant an inch or more below the surface of theground and pulling out the top. This can be done veryrapidly with a spud. There can be no effective weed control unless fencecorners, roadsides, and waste places are kept clean, andthe state laws against noxious weeds are more vigorouslyenf
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
