40 



BULLETIN 1105, U. S. DEPARTMENT OF AGRICULTURE. 



a neutral strip 2 feet wide was an undisturbed plot. On account of 

 deficient seed supply and unfavorable climatic conditions, few seed- 

 lings appeared on either the cultivated or the natural plots until 

 1919. By this time the soil on the cultivated plots had become 

 packed. Vegetation had begun to reestablish itself, but, with the 

 exception of a few plots, is was sparse. Seedling counts in August, 



6 



S 

















SAMPLE PLOT 18 









6 



LCGENO 

 1 Natural. 5un 0-2Sff) 







2 Cultivated, ■ 0-25- 



3 Natural, ■• Over- 25 - 

 •4- Cultivated, • Over-25- 



5 Natural , Shade 0-25- 



6 Cultivated. - 0-25 -. 



■s 



5 

 2 



J 



5 





12 3 4- 





1 2 3 4. 5 e 



§ September, 1921 Count 



Superimposed on September, 

 1919 counV 

















1 2 3 4- 5 C 1234-56 IC34-56 













a 





HnHn 





n^nnnll n_n„nfl „ n_r,n 



1 

















V - ■ '■ 7 V — ■ ' J 



June 1,1920 



August I IS20 



November 15.1920 



















SAMPLE PLOT 3A 









6 



7 











5 







s 





3 











2 3 4- 



12 3*5 





1 6 8 











; 







l 2 3 4- 5 



I 2 S 4- S 



1 2 3 4- 9 







. 





Dl 



! 





fin 





Onnnfl 



n n n r, 11 



ft n n « (1 



V 





3 v 















Sept 1. 1918 



May 26.1920 August 5. 1920 November 11.1920 



SAMPLE PLOT 38 







5 











5 











6 





12 3 4 



5 











I * 3 4- 



1234-5 6. I234-56 1*34.56 





LJ 



,[ 



Di 



| 



Onn 



n I'l n n II 1 n D n „ fl n nnnflll 











D"\ 







Sept. I 1919 May 20 1920 Augujt 13 1920 November 12 IKO May 15 1921 



Fig. 4. — Relation of cultivation, shade, and litter to germination and survival. 



1919, almost invariably showed a higher number on the natural than 

 on the cultivated plots, except where the ground was heavily shaded 

 by trees, or was covered with leaf litter or moderate amounts of 

 vegetation. (See Tables 11 and 12 and Fig. 4.) Under the condi- 

 tions last named the number of seedlings may be greater on the cul- 

 tivated than on the natural plots. This indicates that, other things 



