Food for 

 Plants 



190 



Sulphate of ammonia, Nitrate of Soda, sulphate, 

 Nitrate and muriate of potash are generally held to .be en- 

 tirely exhausted by the crops grown the season of their 

 application. 



The figures given above are always used in fixing the 

 price for new tenants. In this country no such careful esti- 

 mates have been made, but the proportions probably vary 

 but little from those in other countries. 



Amounts of Nitrogen, Phosphoric Acid, and Potash Found 



Profitable for Different Crops Under Average 



Conditions Per Acre. 



(Taken Chiefly from New Jersey Experiment Station's Reports.) 



Nitrogen, PhosphoricAcid, Potash, 



Pounds. Pounds. Pounds. 



Wheat, rye, oats, corn 16 40 30 



Potatoes and root crops 20 25 40 



Clover, beans, peas and other leguminous crops. .. 40 60 



Fruit trees and small fruits 25 40 75 



General garden produce 30 40 . 60 



The Various Potash Salts and Their Composition. 



A. 



Natural Products of the 

 Mines. 



Kainit ... .. 

 Carnallite. 

 Kieserite. . 



Sylvinite. 



1!: 



B. Concentrated Products. 



a. Sulphates of Potash. 



1. Sulphate of potash, high-graded, 96% 



2. Sulphate of potash, high-graded, 90% 



3. Double .sulphate of potash and sulphate of 



magnesia (double manure salt) 



4. Calcined kieserite 



b. Muriates of Potash. 



1 90-95%. 

 Muriate of potash > So-S.s% . 



J70^5%- 



Calcined manure salt, high grade • 



Calcined manure salt, low grade 



21-3 



50-4 



2.0 



15 S 

 II. 8 

 24.7 

 II. I 



14.0 



1.6 



1-7 



QI.7 



8.V.S 

 72-.'i 

 44 5 

 25.6 



.2 

 '3) 



is 



(/3 



14-5 

 12. 1 



21-5 



5-8 

 11.8 

 II 



0.7 

 2.7 



.^4-0 

 65.6 



.2 



2.S, 



•o a 



o o 



12.4 34.6 



21.5 22.4 

 17.2 26.7 



4.0 46.2 



5.1 38.2 

 9-3'34-9 



0.4 



l.o 



0.2 



0.4 



0.8 



22.5 



3-1 -I 



0.2 



0-3 

 0.6 

 4.6 

 6.3 



V 



(fl p. 

 .c >, 

 P-C 



3'"' 



0.2 

 1.2 



2-5 



0.9 



7-1 

 14-5 

 21.0 

 12.4 

 10.3 



1-7 

 1-9 

 0.8 



I 9 

 3-6 



3.6 



0.3 

 0.4 



0.9 

 6.5 



0.2 

 2.9 

 3 5 





0.8 



o 5 

 1-3 

 1-9 



I. 



0.2 



o 3 



12.7 



26.1 



20.7 



8.4 



9- 

 8-3 



0.7 

 2.2 



0.6 II. 6 27.2 



15.7 II. I 



0.2 

 0.2 



0-5 



5-3 



10.6 



52-7 

 49-9 



3 a 



V o 



m g 



-J 

 01 



0.6 

 I.I 

 2..1 

 7.8 

 12.6 



57-9 

 52-7 

 46.7 

 28.1 

 16.2 



.34-9 

 72-3 



30.0 

 40.6 



