206 POMOLOGY 



Table LXV 

 average annual yield to the acre in bushels (1909-1918) 

 Plot 

 1 Sod 99 



4 Clean tillage 191 



5 Tillage cover-crops 196 



6 To the acre: 

 70 lbs. nitrate 



245 lbs. basic slag 188 



140 lbs. sul. potash 



7 To the acre: 

 70 lbs. nitrate 



298 lbs. acid phos 154 



140 lbs. sul. potash 



8 To the acre: ' 

 70 lbs. nitrate 



695 lbs. acid phos 145 



140 lbs. sul. potash 



9 To the acre: 

 210 lbs. nitrate 



298 lbs. acid phos 160 



140 lbs. sul. potash 

 10 To the acre: 



70 lbs. nitrate 



298 lbs. acid phos 176 



350 lbs. sul. potash 



176. The Maine experiment. — Much the same result 

 has been obtained in the Maine experiments. A mature 

 Ben Davis orchard of 400 trees was divided into three plots 

 and the following treatments given: Plot A has had no 

 fertilizer since 1912; plot B has received amiually since 1912, 

 500 pounds to the acre of a fertilizer carrying 4 per cent ni- 

 trogen, 8 per cent available phosphoric acid, and 7 per cent 

 potash; plot C has been given annually since 1912, 1000 

 pounds to the acre of a 4-8-7 fertilizer. For three years 

 prior to 1912 the entire orchard was cultivated and fertilized 

 at the rate of 1000 pounds to the acre of a 4-8-7 fertilizer 



