30 



BOTANY OF CROP PLANTS 



stocks are broken into a number of separate pieces by 

 cultivating implements, each piece may develop adven- 

 titious roots, establish itself, and send up leafy shoots. Fre- 

 quent cultivation that has as its aim the destruction of new 



i/jp— decurrent 



leaf base 



xhizome 



Fig. 12. — Portion of a sprouting potato tuber. 



shoots as soon as they appear, may succeed in starving out 

 the rootstock after a time. The period of time depends upon 

 the amount of stored food material in the structure. This 

 method of eradication is based upon the knowledge that the 



