FERTILIZERS AND MANURES FOR THE ORCHARD 181 



fruit-trees from the soil will give a basis on which to study 

 the plant-food requirements of an orchard. Such modifica- 

 tions as are suggested in the introductory paragraph will 

 be considered later. There are marked variations in the 

 analyses reported by chemists, due probably to a difference 

 in methods and to the varying material analyzed. In order 

 to obtain a satisfactoiy set of figures, Stewart has averaged 

 a large number of analyses of the apple that were made 

 in both America and Europe and reports them in the form 

 of percentage of diy matter, instead of on the basis of ash 

 constituents as they are given in Chapter I. The following 

 table summarizes this information: 



Table LIII 

 the composition of apple wood, leaves, and fruit 



The same writer has made a comparison of the total draft 

 of an apple and a wheat crop to the acre, assuming vigor- 

 ous and productive plants in each case. Such a collation 

 is of interest, for it has usually been assumed that the apple 

 makes a lighter draft on the soil in comparison with a grain 

 crop. Table LIV compares the plant-food materials util- 

 ized by the two crops. 



