WESTERN LARCH 



Survival (fig. 12). — The overall survival of western larch after 

 3 years was 65 percent, ranging from 33 percent to 94 percent. 

 Both storage method and planting date have had a strong effect 

 upon survival. For all planting dates the larch stored over winter 

 in frozen condition survived better (71 percent) than either fresh 

 or refrigerated stock (both 62 percent), but these differences 

 were not statistically significant. Survival of the April 18 planting 

 (87 percent) was significantly better than all other plantings; sur- 

 vival of the June 20 planting (39 percent) was significantly 

 poorer than all others. 



too r 



40 - 



Average survival = 65 % 



Average . 



87% a 

 J 



67 % b 67 % b 



Average 

 '• Fresh -62% b 

 Frozen - 71% 

 Ref. - 62% b 



39% c 



4 ; 18 



S 9 



3 '30 



6/20 



PLANTING DATE 



Figure 12.— Effects of storage regime and planting 

 date on third-year survival of field-planted western 

 larch stock. Average survival percentages (in a row 

 for planting date and, for storage treatment, in a col- 

 umn) followed by the same letter are not significantly 

 different (p = 0.05). Survival percentage levels, within 

 a planting date, connected by arrows with an accom- 

 panying asterisk are significantly different (p = 0.05). 



Growth (fig. 13). — Growth averaged 30 inches (76.20 cm) for 

 all storage and planting date treatment combinations, with a 

 range from 21 inches (53.34 cm) to 37 inches (93.98 cm). For all 

 planting dates, frozen stock grew best (33 inches [83.82 cm]) and 

 fresh stock grew poorest (27 inches [68.58 cm]). Planting date 

 had an even stronger influence. Growth ranged from 32 to 

 36 inches (81.28 to 91.44 cm) for the April 18 and May 9 plant- 

 ings, to 23 inches (58.42 cm) for the late June planting. Frozen 

 stock consistently had the greatest third year height, and fresh 

 stock was almost as consistently the shortest after 3 years. The 

 effects of late planting in reduced height growth were more pro- 

 nounced with fresh and refrigerated storage stock than with the 

 frozen stock. 



Stem production (fig. 14). — Larch averaged 168 ft (51.20 m) 

 of stem production per 100 planted trees, and ranged from 278 ft 

 (84.73 m) to 59 ft (17.98 m). When stem production was aver- 

 aged over all planting dates, frozen stock outproduced refrig- 

 erated and fresh stock by a wide margin (201 ft [61 .28 m] vs. 

 162 ft [49.38 m] and 141 ft [42.97 m], respectively). Averaged 

 over all storage treatments, growth ranged from 232 ft (70.71 m) 

 for the April 18 planting, to 74 ft (22.55 m) for the June 20 

 planting. 



Averages 

 Storage Treatments 



Fresh - 27 " b 

 Ref. - 30 " b 

 Frozen - 33" a 

 Planting Dates 



40,- 



30 - 



10 - 



4/18 - 32 ' 

 5/9 - 36 1 

 5/30 - 29 ' 

 6 (20 - 23 ' 

 overall - 30 1 



April 18 



May 9 



May 30 



June 20 



PLANTING DATE 



Figure 13.— Effects of storage regime and planting 

 date on third-year height of field-planted western 

 larch stock. Columns, within a planting date group, 

 topped by the same letter are not significantly dif- 

 ferent (p = 0.05). Averages, of storage treatments or 

 planting dates, followed by the same letter are not 

 significantly different (p = 0.05). 



300 



3 200 



S 100 



Averages 

 Storage Treatments 



Fresh - 141 1 b 

 Ref. - 162 ' b 

 Frozen - 201' a 



Planting Dates 



4/18 - 232 ' a 

 5/9 - 201 1 b 

 5/30 - 165 ' b 

 6/20 - 74 1 c 



April 18 



May 9 May 30 



PLANTING DATE 



June 20 



Figure 14. — Effects of storage regime and planting 

 date on third-year stem production of field-planted 

 western larch stock. Columns, within a planting date 

 group, topped by the same letter are not significantly 

 different (p = 0.05). Averages, of storage treatments 

 or planting dates, followed by the same letter are not 

 significantly different (p = 0.05). 



10 



