98 



MAINE STATE COLLEGE 



EXPERIMENT OF H. L. LELAND FOR 1890. 



Crop Beans. 



Name of Fertilizer. 



Amount Yield of 

 beans 

 per acre 



per acre 



in 



1" - 



in 



bush. 



la 



Sa. 



Acid S. C. Eock 



Sulphate of ammonia 



Muriate of potash 



Fine ground S. C. Eock 



Sulphate of ammonia 



Muriate of potash 



Caribbean Sea Guano 



Sulphate of ammonia 



Muriate of jtotash 



Sulphate of ammonia 



Muriate of potash 



No fertilizer 



Acid S. C. Eock 



Sulphate of ammonia 



Muriate of potash 



Fine ground S. C. Eock 



Sulphate of ammonia 



Muriate of potash. . . 



Caribbean Sea Guano 



Sulphate of ammonia 



Muriate of potash ( 



Sulphate of ammonia j 



Muriate of potash 



No fertilizer 



500/ 

 130 J 

 lOo) 

 1000 

 150 

 100 

 725, 

 ISO! 

 100) 

 150/ 

 100 $ 



500) 

 130} 



v :. » 



10001 



150;- 



lOOj 

 725 1 

 150}- 

 100 J 



130/ 



loo J 



9.7 



6.3 



4.0 

 4.0- 



10.5 

 8.4 



6 4 



4.9 



3.7 



Five sets of experimental fertilizers were sent out to farmers 

 last spring having the same general object as those that were sent 

 out in 1889, namely, the determination of the availability of 

 phosphoric acicl in crude phosphates. These sets were arranged 

 for tenth acre plots like those in the preceding year. The phos- 

 phates used for crude material were South Carolina rock and 

 Thomas' Slag. 



The latter is a fertilizing material that has come into notice 

 within a few years. It is a by-product resulting from the manu- 

 facture of a certain grade of steel and contains a considerable 

 quantity of free lime, together with a varying amount of phos- 

 phoric acid. The lot purchased by the Station carried twenty per 

 cent, of phosphoric acid, of which six per cent, was soluble in 

 ammonium citrate. 



Rather remarkable results have been obtained by the use of 

 this material in experimental work, and the question has arisen, in 

 the minds of some, whether the favorable action of this phosphate 

 was not in part due to the free lime it contains. Hence two plots 

 have been arranged which receive an equal amount of phosphoric 

 acid in South Carolina Rock, to which is added an amount of free 

 lime equal to that contained in the Thomas' Slag. The nitrogen 

 in this set was furnished in the form of nitrate of soda and the 

 potash as muriate of potash. 



