SULFATE OF AMMONIA. 85 



received low-grade sulfate of potash-magnesia, while 6, 7, S and 9 have 

 had muriate of potash applied to them. 



The plots have had applications of lime at irregular intervals. In 

 1894, plot 8 alone received a small application of air-slaked lime at the 

 rate of 500 pounds per acre, because it had been persistently inferior to 

 all others in production. The lime produced a favorable effect. All the 

 plots were dressed with hydrated lime in 1898 and again in 1905, at the 

 rate of 1 ton per acre each time. The east half of each plot received an 

 application of hydrated lime in 1909 at the rate of 5,000 pounds per acre, 

 and again in 1913 at the rate of 4,000 pounds per acre. 



The east half of the field is positively moister than the west half, so 

 that a fair comparison between the yields produced with lime and those 

 without it cannot be made; but the effects of liming on the relations of 

 the plots to each other can be determined. 



The arrangement of the plots permits the comparison of yields from the 

 plots treated with suhate of ammonia with the yields from plots without 

 nitrogen lying directly beside them. 



Scheme of Fertilization of Plots. 

 North. 



9. No nitrogen, superphosphate, muriate of potash. 



Lime. 

 1898, 1905. I 1898, 1905, 1909, 1913. 



8. Sulfate of ammonia, superphosphate, muriate of potash. 



Lime. 

 1894, 1898, 1905. I 1894, 1898, 1905, 1909, 1913. 



7. No nitrogen, superphosphate, muriate of potash. ■ 



Lime. 

 1898, 1905. I 1898, 1905, 1909, 1913. 



6. Sulfate of ammonia, superphosphate, muriate of potash. 



Lime. 

 1898, 1905. I 1898, 1905, 1909, 1913. 



5. Sulfate of ammonia, superphosphate, sulfate of potash-magnesia. 



Lime. 

 1898, 1905. I 1898, 1905, 1909, 1913. 



4. No nitrogen, superphosphate, sulfate of potash-magnesia. 



Lime. 

 1898, 1905. I 1898, 1905, 1909, 1913. 



South. 



