156 



Peach-Growing 



Of course the total amount of plant-food taken by the 

 trees is not represented in the table, since the increase in 

 the size of the trunks, in the limbs more than one year old, 

 and in the roots is not included in the analyses made. There 

 is good reason for assuming, however, that the amount of 

 plant-food entering into the growth of these parts of the 

 tree is relatively small and would not very greatly affect 

 the totals. 



Therefore, since the above figures are not absolute in 

 their accuracy, there is no violation of facts in discarding the 

 small fractions in the table and presenting the substance in 

 a more condensed form as follows : 



Table V. — Approximate amounts of plant-pood taken an- 

 nually BY A MATURE PEACH TREE IN BEARING ; ALSO BY AN 

 ACRE OF TREES (108 TREES) AND THE RATIO OF THE DIFFERENT 

 FOOD ELEMENTS 



PliANT-FoOD 



Amount 



Taken by One 



Tree 



Nitrogen . . . 

 Phosphoric Acid 

 Potash . . . 

 Lime . . . . 

 Magnesia . . 



lbs. 

 0.63 

 .14 

 .60 

 .95 

 .30 



Amount 



Required by 



One Acre 



(108 trees) 



lbs. 

 68 



15 



65 



102 



32 



Ratio Based 

 ON One Pound 

 OF Nitrogen 



1.00 

 0.25 

 1.00 

 1.50 

 0.50 



In this table, which is based on Table IV, the demands 

 made by peach trees on the soil fertility are suggested. 

 Obviously these demands vary considerably from year to 

 year as the crop varies. The last column in Table V shows 

 the ratio in which different food materials are used. Thus, 

 for every pound of nitrogen taken up by a tree there is 



