Table 1 . --Average emergence (percent) , survival (percent) , and height (cm) of antelope bitterbrush and 



wedgeleaf ceanothus seedlings and transplants^ 













Survival ^ 







Height 





Species 



Seed 

 source 



Planting 

 method 



Emergence^ 



Year 

 1 



Year 

 2 



Year 

 3 



Year 

 6 



Year 

 1 



Year 

 2 



Year 

 3 



Year 

 6 



Bitterbrush 



Idaho 



Seedling 



97a 



99 



98 



96 



94a 



11 



24 



26 



55a 



Bitterbrush 



Nev. 



Transplant 



-- 



87 



70 



56 



39c 



16 



31 



23 



53a 



Bitterbrush 



Idaho 



Transplant 





94 



90 



88 



86b 



16 



32 



28 



57a 



Wedgeleaf ceanothus 



Calif. 



Seeding 



36b 



79 



59 



53 



47c 



4 



10 



16 



32b 



Bitterbrush 



Nev . 



Seeding 



99a 



98 



94 



88 



78b 



10 



23 



19 



54a 



Wedgeleaf ceanothus 



Calif. 



Transplant 





92 



86 



76 



61d 



19 



24 



26 



37b 



^Column values not having the same letter are significantly different (P<0.05). Comparison of treat- 

 ment means followed Snedecor (1956, p. 253). Arcsin transformation was used for percentages. 



^Emergence percentage values based upon the number of scalps that had at least one emergent seedling. 



^Survival percentage values for seeded scalps based upon the number of scalps that had emergent 

 seedlings; survival was calculated as the percentage of scalps with surviving plants. 



Survival 



With two exceptions, survival during the critical first-year growing season exceeded 90 

 percent (table 1). Seeded wedgeleaf ceanothus averaged 79 percent survival; bitterbrush trans- 

 plants from the Nevada seed source averaged 87 percent survival. First-year precipitation, 

 soil moisture, and survival trends are shown in figure 2. Monthly means of precipitation and 

 temperature immediately preceding and during the growing season are compared with long-term 

 records in table 2. Growing-season precipitation was below normal except for the month of June, 

 during which rainfall was more than double the long-term average. July and August were almost 

 without rainfall. April -to-September temperatures were generally above normal. Soil surface 

 temperatures measured on the planting site were commonly above 150° F (66° C) in July and 

 August . 



Table 2 . --Comparison of 1968 and 1969 weather data with long-term records, Garden Valley Ranger 



Station, Idaho 



Precipitation Temperature 



Departure Departure 



Month 



Total 



from normal 



Mean 



from normal 







■ - cm ----- 







- ""C - - 





October 



3.9 



-0.4 



8 



8 



-0 



. 7 



November 



9.0 



+ 1.7 



2 



6 



+1 



.0 



December 



12.1 



+ 2.6 



-2 



3 



+ 



.2 



January 



18.9 



+ 10.3 



-2 



3 



+ 2 



.0 



February 



4.7 



-3.0 





9 



+ 



. 1 



March 



1.4 



-5.3 



2 



2 





.8 



April 



1.5 



-3.0 



8 



8 



+ 



.4 



May 



1.9 



-2.6 



14 



3 



+ 1 



.6 



June 



8.7 



+ 5.2 



16 



8 



+ 



.3 



July 



.1 



- .7 



20 



9 





.7 



August 



.0 



-1.0 



21 



9 



+ 1 



.6 



September 



2.0 



+ . 2 



17 



4 



+ 1 



.6 



Year 



64.2 



+4.0 



9. 







+ 



.6 



5 



