232 JOURNAL OF FORESTRY 



(i) As a temporary crop on intrinsically good agricultural land, 

 which it is desired to hold for future clearing and development, it being 

 more advisable to first work up intensive agriculture on areas already 

 cleared. 



III. 



Profits to be expected from growing of timber, based upon possible 

 yields of stands of different species under management on different 

 qualities of site and upon possible future stumpage values for forest 

 products, are the most important practical determining consideration 

 to be used in land classification work. Unfortunately, at present for- 

 esters are very inadequately prepared to answer questions relating to 

 possible yields of well-stocked stands of different species under man- 

 agement on different qualities of site or physical types of land. The 

 collection and computation of figures dealing with the growth of stands, 

 a primary practical problem that should engage the attention of for- 

 esters, has been very much neglected. From the standpoint of econ- 

 omic land utilization studies a large amount of work is needed on in- 

 vestigation of yields of well-stocked stands of different ages, species 

 and types, which indicate the productive capacity of land under forest 

 management. The resultant yield tables should be tied up to site classes 

 based on height of a given species or type, at a given age, as height is 

 the most practical index to use in judging differences in yield capacity 

 of different land for different species and types. 



CONCLUSIONS AND SUGGESTIONS 



1. All public forestry agencies should enter the field of land classi- 

 fication as a basis for classifying land economically best fitted for grow- 

 ing of forest. 



2. A program of forestry for the nation should concentrate very 

 largely on land classification with reference to what lands should be 

 used for forests. 



3. Such a program should be along two general lines : 



(a) Determination and mapping of broad areas throughout the Na- 

 tion which obviously should be in permanent public forests T Federal 

 or State) for general economic reasons of public welfare. For this 

 work Federal and State forestry organizations should assume entire 

 responsibility. 



