KESIDUAL EFFECT OF FAEMYAED MANUEE 79 



obtained from the three plots in question for the first forty 

 years that elapsed since the dung on Plot 7-1 was discontinued, 



1852/71. 1872 1873. 1874. 1875. 1876. 1877/81. 1882/86. 1887/91. 189^96. 1897/1901. 



Dung to 1871, then Unmanured. K : .jj Unmanured the whole time. 



I 



FIG. 12. Barley. Total Produce, showing residual effect of Dung and no 

 Manure in relation to the Dung Plot = 100. 



the first five years are given singly, after that five years are 

 grouped into one period and the mean result given. In order 

 to eliminate the effect of seasons, the crop results have all 

 been reduced to the common standard of the crop on the 



