476 RETURN OF MATERIAL TO THE Hop Root. 

the figures it is desired to estimate—the gross amount of 
nutrient material returned to the root. The composition 
of hopbine, green and ripe, may therefore be shown as 
the table above. 
In the case of the leaves it is still more difficult to obtain 
the actual weight of dry matter per hill when dead; the 
degradation of the softer material is great, the leaves get 
rubbed and frayed and blown away wholesale, so that 
probably the best approximation will be obtained by 
assuming that the mineral matter remains constant, and 
calculating the proportions of Nitrogen, Phosphoric Acid, 
and Potash on this basis. The following table shows the 
composition of green and dead hop leaves worked out in this 
way :— 







| Percentage. Lbs. per acre. 
| Ash = 100. 
re | 
| Green. Dead. Green. Dead. 
Dry Matter . . - =| S00 495 1004 614 
Ash 100 100 124°5 124°5 
Nitrogen - - - ; - | 20°5 10°5 25°4 130 
Lime - - - - - - | 55°2 47°8 68°4 59°7 
Potash - : - : - | 13°8 212 67°I 2°65 
Phosphoric Acid - - | 3:9 3°0 4°82 S075 
By combining the figures for bine and leaves the follow- 
ing results are obtained, showing the amount of material per 
Material in Bine and Leaves, lbs. per Acre. 

| 
| 




oa | Green. Dead. || Returned to Root. 
lbs. lbs. | lbs. 
Nitrogen - - : 38°1 17°5 20°6 = 54 per cent 
Lime - - : 2 92°3 8S8°1 ee ee 
Potash - - - : 30°5 4°35. || 26:15 = Shy 
Phosphoric Acid - : 9°59 4°79 4°8) = 50 

