146 



The Rothamsted Grass Experiments. 



manded a more extended range of soil than those which 

 remained had disappeared. The total number of species 

 became greatly reduced, grasses largely predominating. 

 Thus, Festuca ovina (sheep's fescue) sometimes yielded more 

 than half, and Agrostis vulgaris (fine bent) more than a 

 quarter of the total produce ; there was scarcely any 

 leguminous herbage ; the miscellaneous species were few, and 

 added but little to the total weight, except Rumex Acetosa 

 (sorrel), which was objectionably nourishing. G-enerally, 

 the stunted foliage was of a very dark green colour, indicating 

 a very high percentage of nitrogen in its dry substance, or 

 rather a deficient assimilation of carbon in proportion to the 

 nitrogen taken up. 



TABLE XXXI. AVERAGE PER ACRE PER ANNUM, BY 400LB. 

 AMMONIA-SALTS ALONE ; PLOT 5. 



Average per Acre per Annum. 



3. Nitrate of soda alone : Plots 15 and 17. Here also are 

 brought out the effects of a continuous supply of nitrogenous 



