Table 6.— Length of nursery stock storage, in days, prior to 

 planting, 1972-73 



Storage method and length of storage 



Planting date, 1973 



Refrigerated 



Frozen 



Fresh 



April 18 

 May 9 

 May 30 

 June 20 



30 

 51 

 72 

 93 



Days 



140 1 

 161 

 182 

 203 



None 

 None 

 None 

 None 



Approximate; seedlings were lifted between November 27 and 

 December 1, 1972 (135 to 139 days prior to April 18). 



Coeur d'Alene, Idaho. It was logged in 1971 , slashed, and pre- 

 scribed broadcast burned in 1972. Burning was quite complete 

 with all small slash consumed; a number of small logs on the 

 ground were charred and not completely burned. The site is typ- 

 ical of the grand fir/pachistima habitat type (Daubenmire and 

 Daubenmire 1968). West and north aspects were represented. 

 Western larch and lodgepole pine were planted in one block on a 

 uniform west aspect while the spruce was planted on a northerly 

 aspect. 



The summer of 1973 was extremely dry and hot compared to 

 normal weather for the area (fig. 5). April through August pre- 

 cipitation was 51 percent of normal. Such weather was favorable 

 for the field test because application of a high degree of moisture 

 stress to the seedlings was desirable. 



Survival was checked at the end of the first and third growing 

 seasons (1973 and 1975). The total height of sample trees (every 

 third survivor) was measured in the fall of 1975 to the nearest 

 inch. Third-year survival, third-year height, and stem production 

 (stem length produced per 100 planted trees) were analyzed by 

 standard analysis of variance procedures for a factorial design. 

 Species was included in the analysis as a main effect variable. Re- 

 sults of the analysis are shown in figures 6 through 14. Analysis 

 of variance statistics are summarized in tables 7 through 9. 



l.Op 

 0.8 - 

 0.6 - 



0.4 - 

 0.2 - 



Apr f 



Total ppl, - 0. 95 M 



Arrows on lime scale show planting dates 



Ll 



luly 

 0.00" 



Hug 

 0. 16 " 



ilk 



Sept. 

 2.10" 



FigureS. — Growing season precipitation, 1973, 

 Coeur d'Alene, Idaho. 



Results 



ENGELMANN SPRUCE 



Survival (fig. 6). — Average overall survival of spruce was 

 58 percent, significantly lower than survival of larch and lodge- 

 pole pine. This probably doesn't reflect true spruce potential, 

 since the site was marginal for spruce. Survival ranged from 

 91 percent to 29 percent with a general decline as the planting 

 season progressed. With an average survival of 82 percent, the 

 April 18 planting survival was significantly better than the sur- 

 vival of the May 9 planting (62 percent survival) which was sig- 

 nificantly better than the two later plantings (44 percent and 

 45 percent survival). For all planting dates survival was best with 



refrigerated (65 percent) and frozen (61 percent) stock. Fresh 

 stock averaged only 50 percent survival. The survival of the 

 May 9 plantings was probably depressed by an unusually warm, 

 dry period of 13 days following planting, a natural factor that 

 did not occur in the previous experiment in the moisture stress 

 plots. 



100,- 



_ Average survival = 58% 



Average - 



% a 



621 

 i 



447. c 



Average 

 ,x Ret. -65% a 



Frozen - 61 % a 

 • Fresh - 50% b 



45% c 

 _l 



4/18 



5/9 



5/30 



6/20 



PLANTING DATE 



Figure 6. — Effects of storage regime and planting 

 date on third-year survival of field-planted 

 Engelmann spruce stock. Average survival percent- 

 ages (in a row for planting date and, for storage treat- 

 ment, in a column) followed by the same letter are 

 not significantly different (p = 0.05). Survival per- 

 centage levels, within a planting date, connected by 

 arrows with an accompanying asterisk are signifi- 

 cantly different (p = 0.05). 



Table 7.— Analysis of variance for survival, 1973 field trials 



Source 



DF 



MS 



F 



Prob. <F 



Replication 



1 



3.1250 



0.1407 



0.7110 



Species 



2 



549.0556 



24.7203** 



.0001 



Storage 



2 



218.0556 



9.8176** 



.0007 



Planting date 



3 



1,089.9398 



49.0727** 



.0001 



Species X storage 



4 



35.2639 



1.5877 



.1984 



Species X planting date 



6 



105.6481 



4.7566* 



.0015 



Storage X planting date 



6 



54.4259 



2.4504' 



.0435 



Species X storage X 











planting date 



12 



42.8009 



1.9270 



.0648 



Error 



35 



22.2107 







"Significant at the 95 percent level of confidence. 

 "Significant at the 99 percent level of confidence. 



7 



