170 



AGROPYRU5I 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 i.^ to kill it entirely. To do this, 

 many summer fallow by thorough cultivation all summer; othe:"8 

 plow late in the fall and next spring put in a croj:). The cheapest 

 way to clear -land from quack, is to jilow 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 

 (piiek, cultivate early and often. It cannot be killed by a7iy 

 process of raking and picking it otf 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 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 



season. It must not bo 

 allowed a breathing spell, 

 as 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 ab the North. 



The apex of a rootstock 



is quite sharp and stout, 



/T A\ andnot unfrequently 



Fig. 77.-Rootstock of quack grass which has grOWS through tubcrS of 

 grown through a potato. Reduced one-third.— 

 (Sudworth). 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 



