84 



MAINE STATE COLLEGE 



Table A shows, that of the phosphates applied to this field with 

 this crop, fine ground bone gave the highest yield of peas, while 

 dissolved bone black stood next, the lowest yield being with 

 the South Carolina rock. The table also shows that muriate of 

 potash and sulphate of ammonia have little or no effect when 

 applied alone, and that by far the largest yield of peas 'was 

 obtained from the plots manured with stable manure. 



Table B gives the average yield in bushels of the sets of three 

 plots subjected to the different methods of manuring, and also 

 shows the cost of the gains due to the phosphates and the stable 

 manure. 



TABLE B. 



Kinds of Fertilizers. 



Fertilizers pei 



acre, in lbs. 



5*a 



< - 



DO , " 



> o Z 

 < ~ 



r- i do 



z > 



3°* 



s 1 i 



c 



- ~ i. 

 . -j. — 



3 ff 



a z 







12.3 



660 







Dissolved bone-black.. ~| 



400 













Muriate of potash > 



100 



15.0 



S40 



2.3 



180 § 5.20 



8 2.26 



Sulphate of ammonia . . J 



200 

















360 

















100 



15.7 



980 



3.00 



320 



5.04 



1.68 



Sulphate ot ammonia.. J 



140 















Fine ground S. C. rock ] 



300 















109 



14.3 



S40 1.60 



180 



2.40 



1.50 



Sulphate of ammonia.. J 



200 















M uriate of potash . l 



Sulphate of ammonia.. / 



100 

 200 



12.7 



660 



















40000 



22.7 



1280 



10.0 



620 ■ 



1.87 











In table B it has been assumed that all gains on the plots to 

 which phosphates were applied, above what was produced on the 

 plots manured with sulphate of ammonia and muriate of potash, 

 were due to the phosphates, and that the increase on the stable 

 manure plots over the unmanured plots was due to stable manure. 

 Practically the entire gain of the plots to which phosphates were 

 applied was due to phosphoric acid, as the plots receiving no fer- 

 tilizers produced as great a yield of peas as the plots receiving 

 muriate of potash and sulphate of ammonia. 



The cost of gain is based on the following prices : 826.00 per 

 ton for dissolved bone black, 828.00 per ton for fine ground bone 

 and 816.00 per ton for fine ground South Carolina rock. The 

 price of the South Carolina rock is much too high in comparison 

 to the other phosphates but is what was actually paid in this case. 



