22 



The Bulletin. 



rapidly in size. Fig. 6 shows a pecan tree 16 years old and only 

 41/2 feet high that has been dwarfed by neglect. Such trees are the 

 most ruinous crops that ever encumbered the ground. 



Fig. 10. — Young Pecan in Tree Protector. 



Growing trees require liberal amounts of nitrogen. This can 

 usually be most cheaply added to the soil in the form of a leguminous- 

 cover crop. Whenever the maintenance crops are not occupying the 

 ground between the trees it should be busy in the production of a 

 crop of cowpeas, vetch, clover or other legumes which will enrich the 



