As productivity data for the exclosure accumulate , a graphic 

 approach to data summarization may be more suitable than a statistical 

 one. Figures 2 through 5 portray production in 1977-1979. 



Tables 1 through 12 describe productivity of the exclosure as sampled 

 in 1979. These tables are presented in the same format as earlier reports 

 (Prodgers 1978, 1979) to facilitate comparisons. Means and standard dev- 

 iations are expressed in kilograms per hectare (for pounds per acre multiply 

 by 0.892). N is the number of plots theoretically necessary to obtain a 

 sample within 20 percent of the true mean ninety percent of the time. 

 This represents a deviation from prior years when N was calculated on the 

 basis of an 80 percent probability level. This requirement proved to be 

 too lax. Further refinements may be necessary in the years to come. 



In 1979, only the Ansc-Agsp and Ansc exclosures proved to be non- 

 homogenous at the .05 probability level, compared to five exclosures in 1978. 

 This supports the contention (Prodgers 1979) that the high precipitation of 

 1978 resulted in increased heterogeneity within exclosures. 



