190 



The Rothamsted Grass Experiments. 



was, therefore, a considerable accumulated residue, the 

 amount and the duration of the effects of which it would be 

 of interest to trace. 



TABLE XLVIL AVERAGE PER ACRE PER ANNUM, BY FARMYARD 

 MANURE ALONE, AND WITH AMMONIA-SALTS ; AND BY THE KESIDUE 

 OF THE DUNG, ALSO WITHOUT AND WITH AMMONIA-SALTS : PLOTS 



2 AND 1. 



Average per Acre per Annum. 



In Table XL VII. the comparisons are made with the un- 

 manured plot 3. It has already been intimated that plot 2 



