ON MANURING FOR HOPS. 



203 



given to the soil in Lalf a ton of kelp is much g'reater than is 

 required for the development of the potato crop, 350 bushels 

 of potatoes requiring- only 54|- lb. of soda, while the kelp 

 contains 289 lb. 



Agriculhiral Gazette, Oct. 10, 184G. 



Art. XLVII.— O N MANURING FOR HOPS. 



By J. C. Nesbit, F.G.S., M.C.S.L., &c. 



[After having given a series of elaborate analyses of the 

 mineral ing-redients of the hop, Mr. Nesbit concludes his 

 essay with the following- observations on the constituents of 

 manures required for the cultivation of this plant; according- 

 to the results of the preceding analyses. 



To show the large amount of common manures necessary 

 to supply the potash to an acre of hops, he observes, that] 



The averag-e quantity of potash contained in guano is 

 3 lb. per cwt. 



The straw of wheat contains on an average 5 per cent, of 

 ashes, and every 100 lb. of the ashes contain about 13 lb. of 

 potash. 



Farm-yard dung contains on an average 7 per cent, of 

 mineral ingredients. These contain about 3^ per cent, of 

 potash. 



The following- table, which gives iis the weights of dif- 

 ferent manures necessary to furnish 17 lb. of potash to an 

 acre of land, will make it probable that the large cjuantity 

 of potash taken out of the land by the hop, is the main 

 reason for the necessity of manuring- this plant so highl}'-. 



Quantity of guano, farm-yard dung, or wheat straw, ne- 

 cessary to furnish the 17 Ih. of iiotash tahen from the 

 soil by the acre of Farnham hops. 



