. Agriculture for southern schools. to, but goodfarmers cultivate the ground when there are no weeds, soas to keep the lower layers of the soil moist. Study the habits of weeds. — To get rid of weeds in theeasiest and cheapest way, study their habits. First makesure whether they are annuals. If they are annuals, suchas crab grass, foxtail, ragweeds, and bitterweed, all thathas to be done is to keep them from maturing seed. Ifthey are biennials, like sweet clover, no seeds should beallowed to form for two years. If they are perennials,like Johnson grass, nut grass, thistles, and dock, the forma
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. Agriculture for southern schools. to, but goodfarmers cultivate the ground when there are no weeds, soas to keep the lower layers of the soil moist. Study the habits of weeds. — To get rid of weeds in theeasiest and cheapest way, study their habits. First makesure whether they are annuals. If they are annuals, suchas crab grass, foxtail, ragweeds, and bitterweed, all thathas to be done is to keep them from maturing seed. Ifthey are biennials, like sweet clover, no seeds should beallowed to form for two years. If they are perennials, like Johnson grass, nut grass, thistles, and dock, the forma- 182 WEEDS 183 tion of seeds should be prevented by cutting the topsdown for a number of years. Even if the growth of seedis prevented, there is still more work to be done to rid theland of the roots of these long-lived robbers. The vigorous growth and abundant formation of seedby some weeds are shown in Figs. 121 and 122. Killing perennial weeds. — Weeds that come up yearafter year from the roots are usually not easy to kill..