July, 1917.] 



GROWTH OF APPLE TREES. 



19 



TABLE No. 6. 

 Average Annual Twig Growth per Tree in Plots Woodman 



Orchard. 

 Length in Inches. 



state. However, during the second four years of the experiment 

 the growth of this plot has averaged a little higher than the first 

 four years which seems high when expressed on a percentage 

 basis. 



Plot 4, which is tilled each year throughout the season but 

 has no cover crop and receives no fertilizer has fallen off in the 

 amount of annual growth produced. It has always averaged 

 considerably more growth than the sod plot and with the excep- 

 tion of one instance has averaged considerably more than the 

 two plots (Plots 2 and 3) which are tilled every other year, and 

 for the eight year period averages 7.59 inches or 58 per cent 

 greater than Plot 1. But it is worthy of notice that the second 

 four-year period averages less growth than the first four-year 

 period, seeming to indicate that the soil treatment was scarcely 

 sufficient to maintain the trees in an optimum state of growth, 

 although the yield has been maintained. 



Plot 5 which has clean cultivation until July 10 when it is 

 seeded to a cover crop of crimson clover and latterly with an 

 admixture of winter vetch has averaged 8.72 inches for the eight 

 years showing a little superiority over the previous plot, and more 

 than 80 per cent superiority over sod. As has been pointed out 

 in previous bulletins, it is a little surprising that this superior 



