As a rule, in mixing fertilizers there is not as much Nitro- ^°°^ ^^^ 



wen and potash used as would be beneficial and profitable. — 



By the use of crimson clover and cow-peas for adding ^^^ 

 humus to the soils the amount of Nitrogen or ammonia 

 furnished by commercial fertilizer could be either kept low 

 or reduced. Farmers should generally aim to mix their own 

 fertilizers, as by this means they are sure of what goes into 

 the fertilizer, and, as a rule, they get the plant food cheaper 

 than by purchasing it in ready mixed goods. The mixing of 

 fertilizer can he easily and cheaply done on the barn floor, 

 by the aid of a hoe, shovel and coarse sand screen. 



The following figures give the approxi- _.. __. . 

 mate percentage which each lOO pounds of 

 the various ingredients will represent when they are added 

 to a mixture and the whole made up to a ton or 2,000 

 pounds. 



Each 100 pounds of dissolved South Carolina rock 

 represents 7-10 per cent, of phosphoric acid in a ton 

 mixture. 



Each 100 pounds of standard dried fish or tankage will 

 represent ^ per cent, of ammonia and 4-10 per cent, of total 

 phosphoric acid in a ton mixture. 



Each 100 pounds of Nitrate of Soda will represent 

 about one (i) per cent, of ammonia when made up in a 

 ton mixture. 



Each 100 pounds of high-grade sulphate of potash will 

 represent about 2^ per cent, of potash when made up into 

 a ton mixture. 



For illustration, a fertilizer which has been used with 

 good results on the Station farm for tobacco was made up 

 as follows: 



Dissolved South Carolina rock 1.300 lbs. 



Tankage (10 per cent.) 400 lbs. 



Nitrate of Soda 100 lbs. 



High-grade sulphate of potash 200 lbs. 



Total, 2,000 lbs. 

 This contained approxmiately : 



Phosphoric acid (P, O;^) Q to lo per cent. 



Potash (K, O) 5 " 



Ammonia 3 



