Fertilizers Applied to Timothy on Corn Crop. 



187 



Probably it would not be fair to conclude that the increase in corn for 

 the season of 1908 was due entirely to the residual effect of the fertilizers. 

 The large increases in hay on the treated plats during the seasons of 

 1906— 07, of course, produced here a much heavier sod than was produced 

 on the check plats. This large amount of organic matter when plowed 

 under would undoubtedly have an effect in increasing the yield of the 

 succeeding crop. Conceding this to be true, it is still evident that part 

 of the increase in grain corn was due directly to the residual effect of 

 the fertilizers, there being no consistent relation between the percentage 

 increase in hay for the years 1900-07 and that for the grain corn of 

 1908. The following table will make this clear. 



TABLE V. 



Showing Percentage Increase in Yield of Timothy hay for the Years 1906-7 



AND Percentage Increase in Grain Corn for iqo8 Due to the 



X'arious Fertilizing Elements Applied to the Timothy. 



Elements applied. 



percentage in- 

 crease IN hay. 



1906. 



1907. 



Nitrogen 



Phosphorus 



Potassium 



Nitrogen and phosphorus 



Nitrogen and potassium 



Phosphorus and potassium 



Nitrogen, phosphorus and potassium. 

 Nitrogen, phosphorus.2 and potassium. 

 Nitrogens, phosphorus2 and potassium 

 Nitrogcr2, phosphorvis and potassium . 

 Nitroger!4, phosphorus and potassium. 



19-5 

 23.6 



195 

 33-7 

 61.8 



30.7 



103.5 



99.1 



133-5 

 143 o 

 197.0 



Average 

 for 2 

 years. 



32.0 



18.2 



245 



45-5 



64.8 



40.2 



93-6 



84.1 



138.6 



138.4 



184.5 



Per- 

 centage 



increase 



in grain, 



1908. 



18 

 12 

 64 

 27 

 40 



31 



73 

 87 

 87 



91 



82 



34 

 23 

 08 



91 

 52 

 09 

 22 

 90 

 41 

 49 

 II 



When potassium alone was applied there was produced an increase 

 in hay for the years 1906-07 amounting to 24.5^ and an increase in 

 grain corn for 1908 or 64.o8,<. When nitrogen was added to the potas- 

 sium the yield of hay was increased to 64.8;^, while the residual effect 

 of this fertilizer produced an increase in grain corn much less than that 

 of potassium alone. Here the greatest increase in corn was on the plat 

 producing the smaller yield of hay and consequently having a less dense 

 sod. This would seem to indicate that the increase in corn was due 

 largely to the residual effect of the potassium. It ir.usl be remembered, 

 however, that there was a rather heavy growth of alsike clover on the 

 potassium plat and this fact makes the above comparison, somewhat 

 unfair. 



