January, 1919.] SOD, TILLAGE AND FERTILIZERS. 



13 



TABLE No. 1. 



Influences of Treatments on Yield, Growth and Size. 

 {Ten-Year Average, 1909-1918.) 



Plot 



Treatment 



Yield: 

 Pounds 



Growth: 

 Inches 



Size: 



Per cent 



No. 1 



Quality:* 

 Rank 



1 



2 

 3 

 4 

 5 

 6 



9 

 10 



Sod 



Tilled alternate years 



Tilled alternate years 



Clean cultivation 



Tillage and cover crop 



Tillage, cover crop and com- 

 plete fertiUzer 



Tillage, cover crop and com- 

 plete fertilizer 



Tillage, cover crop and com- 

 plete fertiUzer 



Tillage, cover crop and com- 

 plete fertilizer 



Tillage, cover crop and com 

 plete fertiUzer , 



1 



2 



3 



10 



en 



-?* 

 -J 



• B- 



9 5' 

 a. 



a 



* This refers to appearance rather than eating quaUty. 



In Table No. 2 we have the average yield per tree in pounds in 

 each plot for the ten-year period and the same is shown graphic- 

 ally in Fig. 1. By referring to Table No. 2 where the yield in 

 pounds per tree has been converted into bushels per acre we find 

 that the plots which have been cultivated annually but without 

 fertilizer (Plots 4 and 5) have yielded on the average 191 and 195 

 bushels respectively or 64 and 65 barrels per acre as compared 

 with 99 bushels or 33 barrels per acre on the sod plot which 

 means practically 100 per cent increase. Also we see that these 

 two tilled plots have averaged the highest in yield for the ten 

 years, although some of the fertilized plots have surpassed them 

 in some years. While there is no apparent reason why the 

 fertilized plots should yield less per tree on the average than the 

 unfertilized tilled plots, for the trees appear equally good and re- 

 cently have appeared better, yet it is most notable that they do 

 not yet yield more. While there is a tendency for these plots to 

 increase in yield such an increase in any one year is not particu- 

 larly conspicuous as indicated above. Yet the continually in- 

 creasing size of the trees should bring about a substantial increase 

 in yield during the next decade. 



