MISC. PUBLICATION 16 2, U.S. DEPT. OF AGRICULTURE 



Tree increases each yea 

 height and spread of bran 

 by addmg cm new growth 

 tw.gs 



CROWN 



A.r supplies carbon, 

 the principal food of 

 the tree Taken inon 

 under surface 0"f 

 leaves 



Light end hear 

 necessary tor 



Chemical changes 



Root Tips or roo 

 up water" contai 

 qua 



airs faKe 



ng small 



of m\n era Is in; 



Figure 1. — How the Tree Grows. 



The buds, root tips, and cambium layer are the growing parts of the tree. Water 

 containing a small quantity of minerals in solution is absorbed by the roots, carried up 

 through the sapwood to the leaves and there combined with carbon from the air to 

 make food. This food is carried by the inner bark to all growing parts of the tree, even 

 il'iwn to the root tips. 



