WEEDS AND THEIR CONTROL 



507 



Fig. 241. — Three stages of growth of the quack grass seedling (natural 

 size) ; also enlarged drawing of the seed and spikelet. 



3. Plow ill the fall and expose the root, bulbs or underground 



stem, or seed to the elements. 



4. Practice crop rotations. 



5. Sow clean seed and persistently cultivate. 



