80 THE AMERICAN FARMER. 



generally needful to be supplied artificially, in order to produce good crops, are nitrogen, 

 potash, and phosphoric acid, and that to compound these substances in the proportion in 

 which they are contained in crops, according to an average of many of the most reliable 

 analyses, will make a special fertilizer for each crop, which, if applied, will produce the best 

 of results without apparent exhaustion to the soil. The nitrogen, as given in Prof. Stock- 

 bridge s formulas for special manures (known as the Stockbridge fertilizers), is supplied in the 

 form of sulphate of ammonia, or its equivalent, potash as muriate or sulphate of potash, and 

 phosphoric acid as super-phosphate of lime. We give a few of the Stockbridge formulas for 

 some of the principal crops, which show how small a quantity of each ingredient is necessary 

 when supplied in the proper proportion. With regard to them, Prof. Stockbridge says: 



&quot; The form in which I have obtained nitrogen, potash, and phosphoric acid to compound 

 for the nutrition of plants, in these experiments, has been in that of a neutral salt for the 

 nitrogen and potash, and a superphosphate for the phosphoric acid. For root-crops and 

 beans, I have used the potash in the form of sulphate; for grain and forage crops, in the 

 muriate form. No specific rule can be given as to the quantity of the compounds to be used 

 in preparing any of my formulas, because the percentage of nitrogen, potash, and soluble 

 phosphoric acid they contain is quite variable; but having learned the percentages of the com 

 pounds, the required quantity is easily ascertained. 



WHEAT. FOE ONE ACRE. 



Nitrogen, . . . 41 Ibs., in the form of Sulphate of ammonia, 205 Ibs. 

 Potash, .... 24 Ibs., &quot; &quot; Muriate of potash, . 48 Ibs. 



Soluble phosphoric acid, 20 Ibs., &quot; Superphosphate, . 160 Ibs. 



The crude materials for the above will comprise, as will be seen by the table, over 400 

 Ibs., and are said to increase the crop 25 bushels over the natural yield of the soil. 



INDIAN CORN. FOR ONE ACRE, 



Nitrogen, ... 64 Ibs., in the form of Sulphate of ammonia, 320 Ibs. 

 Potash, .... 77 Ibs., &quot; Muriate of potash, . 154 Ibs. 



Soluble phosphoric acid, 31 Ibs., &quot; &quot; Superphosphate, . 248 Ibs. 



The above is designed to increase the natural product of the soil 50 bushels. 



FODDER CORN. FOR ONE ACRE. 



Nitrogen, . . . 20 Ibs., in the form of Sulphate of ammonia, 100 Ibs. 



Potash, , . . . . 66 Ibs., &quot; &quot; Muriate of potash, . 132 Ibs. 



Soluble phosphoric acid, 16 Ibs., &quot; &quot; Superphosphate, . 128 Ibs. 



Increase over natural yield, two tons. 



RYE FOR ONE ACRE. 



Nitrogen, . . . 25 Ibs., in the form of Sulphate of ammonia, 125 Ibs. 



Potash, . ... 24 Ibs., &quot; &quot; Muriate of potash, . 48 Ibs. 



Soluble phosphoric acid, 1 6 Ibs., &quot; &quot; Superphosphate, . 128 Ibs. 



Increase over natural yield, 20 bushels. 



OATS. FOR ONE ACRE. 



Nitrogen, ... 23 Ibs., in the form of Sulphate of ammonia, 115 Ibs. 



Potash, .... 20 Ibs., &quot; &quot; Muriate of potash, . 40 Ibs. 



Soluble phosphoric acid, 12 Ibs., &quot; &quot; Superphosphate, . 90 Ibs. 



Increase over natural yield, 25 bushels. 



BUCKWHEAT. FOR ONE ACRE. 



Nitrogen, ... 37 Ibs., in the form of Sulphate of ammonia, 185 Ibs. 



Potash, .... 50 Ibs., &quot; &quot; Muriate of potash, . 100 Ibs. 



Soluble phosphoric acid, 15 Ibs., &quot; &quot; Superphosphate, . 105 Ibs. 



Increase over natural yield, 25 bushels. 



