Influence of Fertilizers on the Yield of Timothy Hay. 337 



Two striking features of the above table are, the lesser increase 

 in yield due to the application of phosphorus alone in 1906 than in 

 1905, and the much greater increase in yield due to application of 

 potassium and phosphorus in the latter season as compared with 

 the former. 

 4. From the above table it will be seen that the yield of hay was 

 greater where a fertilizer containing nitrogen, phosphorus and 

 potassium was applied, than where only one or two of these 

 elements entered into the fertilizer. This table would be mislead- 

 ing, however, unless it is pointed out that some of the plats re- 

 ceiving a complete fertilizer, received larger amounts of the single 

 elements than where only one or two elements were applied. The 

 following table shows the average increase in yield for two years, 

 where the quantities of the elements on the several plats remain 

 the same : 



Apparent 



increased yield 



due to fertilizer. 



Pounds hay 



per acre. 



Nitrogen 1,470 



Phosphorus 512 



Potassium 1,089 



Nitrogen and Phosphorus 1,850 



Nitrogen and Potassium 2,185 



Phosphorus and Potassium 1,145 



Nitrogen, Phosphorus and Potassium 2,432 



For further details see table on page . 



5. The evidence seems to be accumulating that the relation of nitrogen 

 to phosphorus is a matter of importance on Dunkirk clay loam in 

 the . production of timothy hay. The following table shows the 

 increase in yield of hay where the three elements were applied in 

 different proportions and amounts : 



22 



