154 



The Rothamsted Grass Experiments. 



Nevertheless, notwithstanding that each year's sawdust con- 

 tained nitrogen equal to between 41b. and 51b per acre, the 

 result was even less produce than without manure in each of 

 the three seasons. Table XXXV. shows the average results 

 on this plot. 



TABLE XXXV. AVERAGE PER ACRE PER ANNUM, BY SUPERPHOSPHATE 

 OF LIME ALONE ; PLOT 4 I. 



Thus, the superphosphate plot gave more produce than the 

 unmanured plot, but the increase was only small, whilst the 

 actual produce per acre declined more than on the unmanured 

 plot. On the other hand, superphosphate alone gave, over 

 the total period, less than two-thirds as much hay as the 

 mixed mineral manure. 



The percentage reduction in annual yield of hay, of 

 nitrogen, and of mineral matter, over the second period com- 



