WHEAT. 



181 



TABLE 51. — Wheat grown for 51 Years in succession on the same Land. 

 Results showing the effects of Mineral Manures alone, and when used in addi- 

 tion to Amm. -salts. Quantities per acre. Produce : Dressed Grain in bushels. 



averages. 



8 years, 1852-59 

 8 years, 1860-67 

 8 years, 1868-75 

 B vcars, 1876-83 

 8 years, 1S84-91 



20 years, 1852-71 

 20 years, 1872-91 



40 years, 1S52-91 



19 



151 



14 



12| 



13} 



17 

 123 



22} 



24 



19 



16! 



184 



22* 

 17} 



274 

 271 



204 



1S4 

 191 



253 

 19 



224 



294 

 23| 

 224 

 21! 



28 

 221 



254 



341 



35 



30 



243 



294 



333 

 274 



30} 



33! 



34! 



31! 



27 



321 



333 



29| 



"sir 



341 



34! 



303 



27 



304 



333 

 283 



31| 



