178 HOPS. 



Wagner's experiments on hop manuring harmonise with 

 those carried out at Spalt, and show that artificials will pro- 

 duce as large a crop, and even 3"6 to 34'4 per cent, more 

 than is obtainable from stall manure alone. He is of opinion 

 that the use of artificials for hops will prove advisable and 

 remunerative under certain circumstances.^ 



Different results, however, were obtained at Hohenheim 

 in 1883, nitrate of soda and superphosphate being found 

 superior to a dressing in which these substances were supple- 

 mented by sulphate of potash and magnesia (Strebel, Hand- 

 buch des Hopfenbaues) . 



Worthy of mention are the researches of the German 

 Hopgrowers' Association, in whose experiments nitrate of 

 soda, superphosphate and potash were used in addition to 

 stall manure. It was found that a dressing of nitrate of 

 soda, superphosphate and stall manure gave a larger crop of 

 cones than the last-named alone ; whilst the joint use of 

 superphosphate, potash and stall manure reduced the yield 

 to less than that furnished by the stall manure alone.^ 



Dr. A. M. Grimm ^ reported that on the Marienhof 

 estate, near Neumark (West Prussia), experiments in hop 

 manuring have been carried on for a decade, very good 

 results being obtained by dressing each stock with — 



100 grams (3J oz.) nitrate of soda = 15 grams of nitrogen. 



,„„ ,„, > , , , r = 17 „ phosphoric acid 



100 „ (3* oz.) superphosphate -< , ui • i 



' ■^ ' "^ ^ *^ I soluble m water. 



70 „ (2Joz.) sulphates of potash ■> 



and magnesia | = ^^ " P°**s'^' 



It has also been found that — 



A larger application of nitrate of soda injures the quality 

 of the cones ; 



' WbcJienschrift des landw. Vereines in BaAern, vol. Ixxxvi. 

 2 Oesterr. landw. Wochenblatt, 1887. 

 ^ Wiener landw. Zeitung, 1897. 



