170 



AOROPYUl'AI RKPENS, HKAUV. 



gives it jiiMt about tilliigc ciiougii t<» n-iioviiti^ iiiid \nic[i it thrifty. 

 Anotlier way is to ciiltivato ('iiouji:li to get a very good (-rop of 

 sonietliiiig else ; a third way is to kill it (.'utirely. To do tliis, 

 many siiiiiiiu'r falh)\v hy tliorough ciillivatioii all suiiinu'r , others 

 [(low late in thu fall and next spi'iug ]nit in aero]). Tho cheapest 

 way to clear land fi'oin ([iiack. is to ])l()\v in the fall, then har- 

 row in the spring, cultivate or gang-plow until rather a lato 

 l)lanting time for corn, then ]ilant. when the corn will come up 

 (pilek, cultivate early and often. It cannot he killed hy any 

 process of raking and })icking it olf the ground." 



As to the mode of killing, tlu' writer has often tried, with ex- 

 cellent success, the plans named hy the last writer. Plow late 

 in tlie fall, and go on to the ground as soon as ])ossil)le after 

 thawing (jut — not waiting for the soil to :;ettle. Cultivate Avell 

 every three days till no traces are seen, which will usually leave 

 time for a late crop of potatoes, corn, or rutabagas in the same 



!;eason. It must not ho 

 allowed a breathing spell, 

 as it then recuperates 

 ra])idly. Jlo not wait for a 

 leaf to show itself. Ciivo 

 it no peace. 



It thrives in the South 

 as well as at the Xorth. 



The apex of a rootstock 

 is (piite sharp and stout, 

 and not nnfrequently 



Fia. V7.-Rootstock of quack grass which luw grOWS through tubors of 

 Krowii through a potato. Ueduced one-thiril. - 

 (Su(lwortli). potato. 



SOHGIIUM, PEliS. 



Spikelets in threes, panicled, the central one liermaphrodite, ses- 

 sile, 1-lld. ; the lateral ones pedicellate, male or sterile, with some- 

 times 1-3 pairs of spikelets at the nodes below. Glumes of the 



