1913.1 



PUBLIC DOCUMENT — No. 31. 



29 



Average Corn Fertilizer co:\rpARED with Fertilizer 

 Richer in Potash. 



North Corn Acre. 

 The two systems of fertilizing have been under comparison 

 for twentj-two years. The object has been to determine 

 whether or not the average corn fertilizer sold on our markets 

 contains the right proportions of nitrogen, phosphoric acid and 

 potash. The field consists of four plots of one-fourth acre each. 

 Two of the plots — 1 and 3 — receive annually an application 

 of a home-made mixture furnishing the different plant-food 

 elements in the same proportions as in average corn fertilizer. 

 The other two plots receive an application of a home-made 

 mixture furnishing less phosphoric acid and more potash than 

 the average corn fertilizer. The rotation is two years of grass 

 and two years of corn. The crop this year was corn. The fol- 

 lowing table shoAvs the relative standing of the two mixtures for 

 this year : — 



The different materials were used on the plots at the follow- 

 ing rates per acre : — 



