COMMUNITY STUDIES 



223 



Old orchards growing under sod conditions, without fertiliza- 

 tion, are often in this class. 



If we were to represent these conditions graphically, illus- 

 trating the amounts and relations of carbohydrates and ni- 

 trates by sizes of letters, the chart would look as follows: 



Class I. Poor growth. Small amount of fruit. 

 C 



Class II. — Rank growth. Small amount of fruit. 



Class III. _ Fair growth. Good fruitine:. 

 N 



Class IV. C Poor growth. Small amount of fruit. 



N 



It can thus be seen that both carbohydrates and nitrogen 

 are very important for tree growth and fruit production. An 

 accumulation of carbohydrates alone, if caused by a lack of 

 nitrogen or some other limiting factor, would probably not 

 cause either growth or fruit-bud formation. A supply of nitro- 

 gen would then be necessary in order to have the carbohy- 

 drates utilized. Likewise a large supply or accumulation of 

 nitrogen would not cause growth and fruiting in the absence 

 of an adequate supply of carbohydrates. Such common orchard 

 operations as pruning, fertilization, and soil management 

 should therefore be considered in relation to their effect on 

 the carbohydrate and nitrogen supply of fruit trees, before 

 deciding upon any definite practices. 



COMMUNITY STUDIES 



1. Inspect several different kinds of fruit trees in your community. 

 Determine : 



(a) Where the fruit buds are formed. 



(b) Where the leaf buds are formed. 



(c) The average length of terminal growth. 



(d) Whether fruit spurs are present. 



