322 Report of the Horticulturist of the 



1 to 2 per cent. At the lower estimate one pound of phosphoric 

 acid per tree was applied each year in this experiment, or 48 

 pounds per acre. The application of from 30 to 60 pounds of 

 available phosphoric acid per acre is commonly recommended for 

 apple orchards. The phosphoric acid in the ashes is mostly 

 insoluble and becomes available slowly. It may possibly become 

 available as readily as the phosphoric acid of coarsely powdered 

 bone. 



Explanation of Diagram. 



Baldwin, treated, Nos. 10, 101, 102, 108, 109, 125, 126, 127, 128. 



Baldwin, untreated, Nos. 81, 111, 133, 136, 137, 207. 



Fall Pippin, treated, Nos. 31, 33, 34, 35, 37, 38, 39. 



Fall Pippin, untreated, Nos. 1, 4, 5, 6, 8, 9. , 



R. I. Greening, treated, Nos. 50, 51, 52, 54, 55, 56, 58, 70, 105, 

 107, 129, 146. 



R. I. Greening, untreated, Nos. 24, 25, 26, 27, 28, 29, 42, 43, 46,48, 

 62, 69, 82, 83, 162, 165, 184, 185. 



Roxbury Russet, treated, Nos. 143, 145, 147, 149. < 



Roxbury Russet, untreated, Nos. 150, 153, 161, 175. 



Northern Spy, treated, Nos. 74, 75, 76, 77, 202, 205, 210, 212, 

 213, 215, 221, 223, 224, 225, 245. 



Northern Spy, untreated, Nos. 116, 206, 208, 227, 228, 229, 230, 

 233, 234, 249, 250, 251, 253. 



The shaded portions indicate sections which were treated with 

 ashes. 



The old trees are indicated by the circles. 



The Varieties. 



The orchard was divided into eight sections as already de- 

 scribed. For convenience these are numbered consecutively from 

 1 to 8. iSections 2, 4, 6 and 8 received annual applications of 

 ashes while the others received none. The accompanying plan 

 gives the relative positions of the sections and the varieties of 

 trees included in them. The following list shows the number 

 of treated and untreated trees of each variety which were of 

 bearing age. ' 



