40 



BULLETIN 1105, U. S. DEPARTMENT OF AGKICULTURE. 



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 f)lots 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, 



h o 



as 



SAMPLE PLOT IB 





s 



LEGCND 



1 Natural. SvA-i 0-ESffl 



2 Cultivated, - 0-25 - 



3 Watu-ral, ■• Over- 25 -K^ 

 4- Cultivated, ' Over-ZS - I TrtiB 



5 Natural , Shade 0-25- 



6 Cultivated, •• 0-25 -J 

 S September, 1921 Count 



Superimposed on September, 

 1919 counf 









3 





1 Z 3 ■<■ 





1 13 4-56 













r 





1234-56 1234-56 i234-S6 









D 





L 



n 





n^rinnll n-n-nfl „ n_r,n 



^ 





J ^ 









I. j'v —r 



August 1.1920 Novembar L5.I920 



SAMPLE PLOT 3A 





s 















5 





, 





e 





2 3 4- 



1 a 3 4- 5 











s 



n 



1 2 3 4. ! 



1 6 . e 



1 i 3 4- S 



1 £ a 4- s 



, 



.,[li 



1 



nn 



nnn.n 



n n t^ r. n 



n n n r, fl 



^ . J \ 











May26.l920 Au^5t5.i920 November 11.1920 



SAMPLE PLOT 3B 





6 







5 









6 



12 3 4- 



5 

 fl 











« S 4. 



1244-5 6, ia34-56 I134.SB 





. Ja^ 



s, , 



flnn 



n n n n n 



n n n r, n 





^ 





) >^ 











Sept. I 1919 May 20 1920 August 13 1920 Novemberl2 1920 May IS 1911 



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 



