Results with Various Manures. 



125 



average produce over thirty-two years, 1852-1883, on each 

 of the sixteen plots. The first column shows the results for 

 the four plots without nitrogenous manure, the second 

 column those for the four plots with ammonia-salts equal to 

 431b. nitrogen per acre per annum, the third those for the 

 four plots with nitrate of soda, and the fourth those for the 

 plots with rape- cake. 



TABLE XXVI. AVERAGE ANNUAL YIELD OP BARLEY UNDER SIXTEEN 

 CONDITIONS OF MANURING, THIRTY-TWO YEARS, 1852-1883. 



Referring first to the results without nitrogenous manure, 

 the first column plainly shows the very marked effect of 

 mineral manures containing phosphates as compared with 

 those consisting of alkalies alone. The second column shows 

 that ammonia- salts alone gave a great increase, which is 

 somewhat enhanced by the addition of alkalies, but markedly 

 so when phosphates are also applied. The plots referred to in 



