Influence of Manures on Yield of Timothy Hay. 



263 



1906 and 1907, has been at the rate of 2901 pounds per acre; the average 

 yield of tliree plats receiving only mineral fertilizers during the same 

 time has been at the rate of 4283 pounds per acre ; seven plats receiving 

 nitrogen as nitrate of soda with or without mineral fertilizers averaged 

 for the three years 5635 pounds per acre; two plats receiving 

 nitrogen in farm manure averaged 6193 pounds per acre. These results 

 may be brought out in a more condensed and detailed form in the 

 following table. 



TABLE HI 



In computing these results, Plats 727 and 728 have been omitted as 

 their treatment was changed somewhat in 1906. While the maximum 

 yield in every case was when nitrogen in some form or other was ap- 

 plied, yet it is evident that the mineral fertilizers, especially the muriate 

 of potash, have been effective in increasing the production of hay. No 

 effect from the application of lime to this soil could be noticed, conse- 

 quently it was regarded as useless to harvest the limed and unlimed 

 parts of the plats separately. It is interesting to note that the residual 

 effect of the farm manure on Plats 731 and 732 produced a larger yield 

 of hay in 1906, more than two years after its application, than it did 

 in 1905, more than one year after its application. In 1907, following the 

 second application of farm manure to these plats, the yield was decidedly 

 increased over previous years, Plat 732 yielding at the rate of almost four 

 and one-half tons of cured hay per acre, the heaviest yield received from 

 any of the plats in the test. The yield seems to be in proportion to the 

 amount of farm manure added, whether it be ten or twenty tons. 



The apparent increases in yield due to the different fertilizing elements, 

 as given in Table IV, will probably give a clearer idea of the relative 

 influence of the different fertilizing materials. 



