Fertilizers Applied to Timothy on Corn Crop. 



193 



TABLE IX. 



Showing Increaskd ok Decreased Yields on the Limed Sections ok the Fertilized 



AND Manuked Plats. Lime Applied in 1908. Fertilizers 



and Manure Applied for Corn. 



Plat Nos. 



707, 709, 710. 

 705. 708 



Treatment. 



Fertilized or manured . . 

 No fertilizer or manure . 



Average 

 increase 



or 

 decrease 

 on limed 



part 



lbs. 



—47 

 + 14 



Average 

 increase 



or 



decrease 



on limed 



part 



/o 



—9-7 



+3-7 



These figures indicate that fertihzers are not more efficient when 

 added to a Hmed soil than when added to one in need of Hme. The 

 increase in pounds is important from a practical standpoint, but the 

 percentage increase is interesting as indicating the possible action of 

 lime in making available plant food. \\'here the natural fertility of 

 the soil was aided by fertilizers the percentage increase on the limed 

 soil was less in both cases than when lime alone was added. 



So far, therefore, as any conclusions may be drawn from these data 

 they are : ( i ) that the efficiency of fertilizers on this soil is not increased 

 by the use of lime; (2) that lime has, on this soil, the efifect of rendering 

 available plant nutrients in the soil: (3) that inasmuch as its action is 

 percentagely greater when fertilizers are not applied, its beneficial 

 efifect is not due so much to its neutralizing or other action, as to the 

 direct liberation of plant food. 



SUMMARY. 



This bulletin shows that both manure and artificial fertilizers have a 

 marked residual efifect. 



On plats 7 11-732, the average yields of the plats receiving fertilizers 

 ^above the check plats shown a gain of 35.8% for forage, 25.15% for 

 sto^•er, and 66.65'/' ^o^ ear corn. In all cases the increase in ear corn was 

 gi eater than that in forage or stover. 



When a single fertilizer was used, potassium increased the ear corn 

 more than nitrogen or phosphorus. When two were used in combination, 

 potassium and phosphorus gave the greatest increase in forage and 

 stover, potassium and nitrogen in ear corn. The maximum increase in 



