22 



PLATE IIlA. 



Mr. J. Keller, of Ernsthofen, made on sandy loam experiments 

 with winter wheat, in each case on three plots, using a complete 

 manure of potash, phosphoric acid, and nitrate of soda, and also 

 leaving out one of them, using only two manures together. All were 

 given as a top-dressing on March 2. The average of each three plots 

 was as follows, calculated at per acre (see plate III and IIlA.) : 



Straw. Grain, Profit. 



No manure 29.2 cwt. 12.1 cwt. 



Complete manure 50.8 cwt. 19.2 cwt. 3/7/6 



Manure without potash ... ... 43.5 cwt. 13.8 cwt. 0/13/2 



Manure without phosphoric acid ... 43.1 cwt. 16.2 cwt. 1/13/8 



Manure without nitrogen ... ... 42.4 cwt. 19.6 cwt. 1/16/8 



The field had been heavily manured with stable dung the pre- 

 vious year for potatoes, and contained quite sufficient nitrogen to give 

 19 cwt. of grain per acre, whether the -. nitrate of soda was applied or 

 not. Only straw was much less without nitrogenous manure. While 

 phosphoric acid was much required, as can be seen, potash was much 

 more so, the profit sinking, without potash, by 2/14/6 per acre. 



Professor H. Boiret recommends the usefulness of phosphoric 

 acid to give the straw of cereals more rigidity, early ripening, and 

 heavier grain. In a French essay received just now I find a most 

 interesting plate, showing plants of "Golden Drop" wheat, how they 

 appear without manure, with farm dung, without Thomas phosphate, 

 without lime, without potash, without nitrogen, and with a com- 



