REPRODUCTION OF WESTERN YELLOW PINE. 



43 



Table 11. — Relation of cultivation, shade, and Utter to germination and survival. 

 Sample Plot 1b, Foet Valley, Old Cutting, Closely Grazed by Horses. 



Date of examination. 



Number of seedlings per square foot. 



Survival per cent. 



to 25 feet. 2 Over 25 feet. 



Nat- 

 ural. 



Culti- „ 



rat- 

 ed. 3 



Nat- 

 ural. 



Culti- 



vat- 



Shade^Oto 

 25 feet. 



to 2-5 feet. Over 25 feet. 



Shade, to 

 25 feet. 



Nat- 

 ural. 



Culti- 

 vat- 

 ed. 



Nat- 

 ural. 



Culti- 

 vat- 

 ed. 



Nat- 

 ural. 



Culti- 

 vat- 



Xat- <*»■ 

 ural. «f 



Sept. 1,1919... 

 June 1,1920... 

 Aug. 1, 1920... 

 Nov. 15, 1920.. 

 Mav20, 1921... 

 Sept. 1,1921... 



1.92 

 .85 

 .22 

 .22 

 .14 

 .07 



.44 

 .15 

 .12 

 .06 

 .04 



Survival, Sept., 1919, to Sept., 1921 



1.04 

 .84 



.49 

 .45 

 .42 

 .31 



0. 65 3. 51 



. 45 1. 30 



.30 .35 

 .16 



.14 

 .10 



.32 

 .26 

 .23 



L83 



.73 



.70 

 .64 

 .59 



0.44 

 .26 



1.00 

 .64 

 .50 



3.6 



0.40 

 .34 

 .80 

 .50 

 .67 



3.7 



0.81 

 .58 

 .92 

 .93 



.74 



29.8 



0.69 

 .67 

 .53 



.71 



0.37 

 .27 

 .91 

 .81 



0.31 

 .40 

 .96 

 .91 

 .92 



10.0 



Sample Plot 3a, Forest Service Cutting, no Grazing; Tall, Dense Bunch-grass. 



Sept. 1,1919 



3.01 

 1.49 



• 4s 

 .40 

 .39 

 .33 



)t., 192 



1.84 

 .99 

 .32 

 .23 

 .23 

 .14 



1 



1.10 

 .50 

 .21 

 .16 

 .16 

 .14 



0.77 

 .38 

 .18 

 .14 

 .12 

 .08 



4.52 

 1.56 

 .77 

 .68 

 .67 

 .60 



8.56 

 3.30 

 2.12 

 1.88 

 1.85 

 1.69 















Mar. 26, 1920 



Aug. 5, 1920 



Nov. 11, 1920 



Mavlo, 1921 



Sept. 1,1921 



Survival, Sept., 1919, to Sex 



0.50 

 .32 

 .83 



.98 



.85 



11.0 



0.54 

 .32 

 .72 



1.00 

 .61 



7.6 



0.45 

 .42 

 .76 



1.00 



.88 



12.7 



0.49 

 .47 

 .78 

 .86 

 .67 



10.4 



0.35 

 .49 

 .88 

 .99 

 .90 



13.3 



0.39 

 .64 

 .89 

 .99 

 .91 



19 7 

















Sample Plot 3b, Foeest Service Cutting, No Grazing; Tall, Dense Bunch-grass. 



Sept. 1,1919 



May 20, 1920 



Aug. 13, 1920 



Nov. 12, 1920 



May 15, 1921 



Sept. 1,1921 



l.SS 

 1.19 

 .24 

 .21 

 .18 

 .13 



Survival, Sept., 1919, to Sept., 1921 



1.00 

 .74 

 .28 

 .22 

 .18 

 .12 



0.94 

 .53 

 .16 

 .16 

 .13 

 .09 



0.71 

 .34 

 .15 

 .11 

 .10 



4.33 

 2.29 

 ..34 

 .44 

 .34 

 .22 



6.53 

 3.38 

 .86 

 .81 

 .62 

 .43 



0.63 

 .20 



.72 

 6.9 



0.74 

 .38 

 .79 

 .82 

 .67 



12.0 



0.56 

 .30 



1.00 

 .81 



9.6 



0.48 

 .44 

 .73 

 .91 

 .80 



11.3 



0.53 

 .24 

 .81 

 .77 

 .65 



5.1 



0.52 

 .25 



.94 

 .77 



1 Plots shaded by trees one-half or more of the day are classed as shaded. Such plots also have con- 

 siderable leaf litter. 



* Distance from seed trees. All of the shaded plots are within 25 feet of trees while those in the sun are in 

 many cases farther away. 



* Cultivated with a mattock to a depth of 6 to S inches in 1914, removing all vegetation including roots as 

 fax as possible. 



