70 



If potash is properly applied it increases the crop, the starch, and 

 the number of large tubers. 



Professor Maercker had from loamy soil from the "Magnum 

 Bonum," without potash, 20,456 lb. per acre; with 8 cwt. of kainifc 

 applied to the former crop, 23,848 lb., or 3,848 lb. more ; with 

 another 8 cwt. given in spring the crop increased to 27,760* lb. per 

 acre, or 7,304 lb. more. 



Mr. Rassmann, of Amoenau, Hesse-Nassau, on good sandy soil 

 realised from stable dung at per acre 67.20 cwt. ; with stable dung 

 and 320 lb. Thomas phosphate, 640 lb. kainit, and 120 lb. nitrate cf 

 soda, 117.20 cwt., or 50 cwt. more, at a cost of l/6/ for the mineral 

 manure. (See plate XII. of a similar experiment by him). 



PLATE XII. 



Experiments by Mr. Rassmann, of Amoenau. Red sand in good 

 cultivation after oats, 1899. 



Photo, of produce from r l B th of an acre. 



84 cwt. 

 30 cwt. stabledung. 



Produce per acre 146 cwt. 30 Ibs. 

 Manured with stabledung and 



4 cwt. Thomas phosphate 



8 cwt. kainit 



li| cwt. nitrate of soda per acre. 

 Net profit on the commercial fertilizers, 3 Os. 6d. per acre. 



