1921.] 



Improvement op Grazed Pastures. 



245 



fore, included in the tables. Kesults on the " No manure " 

 plot are the average for two such plots, one ground adjoining 

 the basic slag plot and the other in the position shown in the 

 tables. 



Table VI. — Aggregate Results for Centre C. Fourth Summer. 





Manures used :— 



Basic 

 Slag. 



1 



(i I'.'a Super- 

 Phosphate, pliosphate. 



None. 



Super- 



pllOSJ)hi\tc 



witli 

 Lime. 



Lime. 



Plant units 

 per unit 

 area 



Graniinete 

 Lcguininos;\? - 

 Miscellaneous 



380 

 87 



33 



387 

 107 

 27 



256 

 50 

 34 



220 

 5^ 



313 

 69 

 44 



191 

 12 

 45 





Total - - 



500 



521 



340 



286 



426 



248 



Percentage 

 Frequency 



Gramine^u 

 Leguniiiio?;e - 

 Miscellaneous 



76-0 

 17-4 

 6-6 



74-3 

 20-5 

 5-2 



75-3 

 14-7 

 10-0 



76-9 

 2-4 

 20-6 



73-5 

 16-2 

 10-3 



77-0 

 4-8 

 18-1 





Total - - 



100-0 



100-0 



100 



99 9 



100-0 



99-9 



In the fourth summer (and in other years also) it was clear 

 from the appearance of the plots that the most successful were, 

 as usual, those on w'hich basic slag, Gafsa phosphate, and 

 superphosphate with ground lime had been applied. The 

 ground lime plot show^ed no improvement whatever, and, if 

 anything, it was rather poorer in appearance than the untreated 

 ground. Ground limestone showed a very slight improvement, 

 while the improvement on the superphosphate plot was well 

 marked, although the line between it and the adjoining Gafsa 

 plot was easily traceable. In this case, again, the results 

 show (Table VI) that on the most improved plots there was 

 a very marked increase in the number of plant units per unit 

 area. Differing from the other centres, however, the 

 miscellaneous plants were much affected in the aggregate, but 

 in the original pasture they stood at a relatively very high figure. 

 The decrease of these plants on certain plots was, however, 

 so w^ell distributed amongst the various species thai the changes 

 in individual species were generally insignificant. 



It is of some interest to note that, in spite of the underlying 

 rock (at no great distance from the surface) , the greatest 

 change was brought about by Gafsa phosphate.* 



Table YII shows that here, as at Centre B, a marked 

 improvement may be accompanied by an increase of Bent 

 grass, although there was no marked change on the super- 

 phosphate with lime plot. 



*At one centre only was Gafsa phosphate inferior to basic slaff, and tliat 

 was on a deep neutral peat in Anglesey. At this centre Gafsa had no effect 

 whatever, while slag had a marked effect. 



