170 AGROPYRUM REPENS, BEAUV. 



gives it just about tillage enough to renovate and keep it thrifty. 

 Another way is to cultivate enough to get a very good crop of 

 something else ; a third way is to kill it entirely. To do this, 

 many summer fallow by thorough cultivation all summer ; others 

 plow late in the fall and next spring put in a crop. The cheapest 

 way to clear land from quack, is to plow in the fall, then har- 

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

 planting time for corn, then plant, when the corn will come up 

 quick, cultivate early and often. It cannot be killed by any 

 process of raking and picking it oil the ground." 



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

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

 in the fall, and go on to the ground as soon as possible after 

 thawing out not waiting for the soil to settle. Cultivate well 

 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 



season. It must not bo 

 allowed a breathing spell, 

 a s it then recuperates 

 rapidly. Do not wait for a 

 leaf to show itself. Give 

 it no peace. 



It thrives in the South 

 as well as at the North. 



The apex of a rootstock 

 is quite sharp and stout, 

 and not unf requently 



Fia. 77. Rootstock of quack grass which has grOWS through tubers of 

 grown through a potato. Reduced one-third. 

 (Smlworth). potato. 



SORGHUM, PERS. 



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

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

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



