4. Continuous heavy grazing at the rate of 72 sheep per square mile. 



5. Intermittent very heavy grazing at a mean rate of 128 sheep per square mile; 

 average 90 per square mile 1941 - 1946 and 168 per square mile 1947- 1951. 



The amounts of bluebush forage and the numbers of bluebush per acre over the 

 period, 1940 (before commencement of grazing) to 1951 are shown in Tables 2 and 3. 

 The weight of bluebush on all treatments fluctuated from season to season and was 

 related to the influential seasonal rainfall (Fig. 5) ; the green weight of edible blue 



41 -42 43 '44 '45 '46 47 '48 49 '50 1951 



1940 '41 



42 -43 



'44 



•48 



■45 46 '47 



Figure 5. 



Weight of Kochia sedifolia, estimated in September, on plots grazed 

 at different rates of Stocking — Yudnapinna. 



Actual weights of forage are shown for the ungrazed control plot to indicate 

 seasonal fluctuations. For the grazed plots weights of forage have been 

 adjusted relative to the ungrazed plot to eliminate the direct effects of season, 

 and the mean of the ungrazed plot (broken lines) is shown for comparison. 



135 



