1921.] Improvement of Grazed Pastures. 247 



(2) At each centre, a marked iraprovenieiit was acconipanied 

 by a marked increase in the total number of plant units per 

 unit area, and this increase was apparently in proportion to 

 the extent of the improvement. 



(3) ^Marked improvement was also invariably accompanied 

 by a corresponding increase in the proportion of White Clover. 



(4) In one case, improvement was accompanied by a 

 decrease of the proportion of Bent grass, which, however, 

 stood originally at a high figure. At the other two centres, 

 the proportion increased as a result of improvement.* 



(5) At one centre Sheep's Fescue w^as profoundly affected 

 by basic slag and by Gafsa phosphate. 



(6) In general, equal quantities of high-grade basic slag 

 and ground Gafsa phosphate gave nearly equal results, but 

 the botanical data strongly suggest that Gafsa phosphate was 

 the more effective. In one case, improvement by means of 

 these manures was quickly followed by a great deterioration, 

 and it would appear that the changes induced by them in the 

 first instance were so great that the pasture was incapable 

 of reverting directly to its original condition. 



(7) Superphosphate with ground lime gave very good 

 results, which were, perhaps, not quite so good as those given 

 by the two manures already mentioned. At the particular 

 centre referred to above, there was not such rapid deterioration 

 as with basic slag and Gafsa phosphate. 



(8) Superphosphate alone w^as in all three cases inferior to 

 the manures already m.entioned, but it produced a considerable 

 improvement. With this manure, the deterioration which 

 followed the initial improvement at Centre B consisted of 

 a reversion of the herbage to its original state. 



(9) Only at one centre did ground lime alone effect an 

 improvement. 



(10^ Results for ground limestone are given for one centre 

 only, where it was more effective than at any other centre. 

 Even here, however, its action was very slow. 



* Cf. Stapledon. K.G. : '•Pasture Problems: The Pesponse of liuli\i«lual 

 Species under Manures." Jour. Agri. Scl., Vol. VI. Part IV, 1'.I14. 



