Potato Fertilizer. ^ 



At the Rhode Island Agricultural Experiment Station the 

 following fertilizer has given excellent results : — 



Pounds per Acre. 



Nitrogen, 60 



Phosphoric acid, 120 



Potash, 150 



\ 



Made up as follows (home mixed) : — 



Pounds per Acre. 



Nitrate soda (nitrogen, 20 pounds per acre), 130 



Sulphate ammonia (nitrogen, 20 pounds per acre), 100 



Tankage (nitrogen, 20 pounds per acre; phosphoric acid, 21 pounds 



per acre), 270 



Acid phosphate (phosphoric acid, 99 pounds per acre), . . .581 

 High-grade sulphate potash (potasli, 150 pounds per acre), . . . 300 



1,381 



This is all applied in and along the sides of the furrows, thus 

 distributing it in a space about 2 feet wide, and then cultivated 

 in along the bottom of the furrow before the seed is dropped. 



This extra stirring, while mixing the fertilizer and deepening 

 the cultivated soil, is believed to be a very beneficial operation. 

 The covering of the seed will further mix the fertilizer with the 

 soil along the sides of the drill in such a way that the growing 

 plants will derive their full benefit from it. 



A crop of 300 bushels to the acre of potatoes will remove from 

 the soil about the following amounts of fertilizer ingredients: — 



Pounds. 



Nitrogen, 61 



Phosphoric acid, 29 



Potash, 104 



It is therefore a rational practice to apply a liberal amount 

 of fertilizer, knowing full well that any portion of it remaining 

 unused by the potato crop will not be lost, but will be used in 

 giving a vigorous start to the succeeding crop of grain or grass. 



I As this article was prepared before the war, the remarks about the use of potash must be oon- 

 sfdered as modified by the present difiBculty in obtaining it. 



