RETURN OF MATERIAL TO THE HOP ROot. A477 
cree 

acre in the bine and leaves in the green and in the dead 
state, the difference representing the amount of material 
returned to the root of the plant. 
From the foregoing results the distribution of the useful 
constituents of the hop crop may be deduced as follows :— 
Material in Hop Crop, lbs. per Acre. 










— | Soldin | Dead Bine and | Returned to | 
| Hops. Leaves. | Root. tow 
lbs. | Ibs. | lbs. lbs. 
Nitrogen - - - 50°'5 17s 20°6 88°6 
Lime - . - | 16°2 88°1 4:2 | 108°5 
| Potash - ; is 3g) | 4°35 26°15 | 69°5 
Phosphoric Acid - | Ley | 4°79 | 4'8 | 25°3 
ripen instead of removing them at picking time, more than 
haif of the nitrogen, five-sixths of the potash, and half the 
phosphoric acid they contain goes back to the root ; amounts 
which are roughly one quarter, one third, and one quarter 
respectively of the whole material taken by the plant from 
the soil during the year’s growth of the plant. 
It is noticeable that the lime, which may be regarded as 
material of little value and easily obtained from the soil, is 
not returned to the root, but is wholly shed with the dead 
bine and leaves. 
The source and ultimate destination of the various nutrient 
materials are shown graphically in the diagram, on which 
the single column above the central line represents the 
quantities of Nitrogen, Lime, Potash, and Phosphoric Acid 
that are contained in the hops and sold; and the pairs of 
columns below represent the same materials in the leaf and 
bine, the left hand column in each case showing the dis, 
tribution between leaf and bine at picking time and the right 
hand column the final division between the rootstock and the 
dead matter. 
Though the gross amounts of nutrient material thus 
retained are not great, being represented approximately by 
