SOIL MANAGEMENT FERTILIZATION OF ORCHARDS. 45 



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 Plot 3 



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Fig. 7. — Relative yields of plots 1, 2 and 3. Yields on plot 1 taken as 100 per cent. 



Whether the wide differences of the crops of 1903, 1907, 1909 and 1911 

 were accidental, or were due'^to the different fertihzers used on the sod 

 mulch system then practiced, it is impossible to saj'. It seems certain that 

 no significant differences have appeared since 1911, and of course the buds 

 for that crop were formed while the plots were handled under the sod 

 mulch system. Both these plots have, since 1913, produced a steadily de- 

 creasing proportion of the crop of the orchard. 



Still another view of the plot yields is shown in Figs. 7 and 8, which 

 show the 3'ields of plots 2, 3, 4 and 5, with plot 1, the manure plot, taken 



