34 



BULLETIN 1105, U. S. DEPARTMENT OF AGRICULTURE. 



Table 10. — Seedling soil survey — Continued. 

 2. Sample plot 3b (Septembek, 1920). 



Plot.i 



H5 



H6 



0.2 acre. 



D6 



H3 



13 



17 



J6 



J7 



LI 



L2 



J4 



0.9 acre.. 



D4 



E4 



Vegetation in order of abun- 

 dance. 



Soil No. 12, rock outcrop: 



Lot, M, C, F, And 



Lot, M, C, Vic, Lup.... 



Total 



Per acre 



Soil No. 6, very stony clay 



M,F,Lot 



F. M, Lot, sparse 



M, Lot, Sit 



M, Vic, Sit 



Sit, M. F, Vic, Lot 



Vic, M, Lot 



Lot,M 



M, Vic, Lot 



M, Sit, Vic 



Total 



Per acre 



Soil No. 24, stony clay: 



J, Vic, M 



F, Sit, Vic, Ann 



Num- 

 ber of 

 seed- 

 lings .2 



444 

 493 



Plot.i 



E 10 



F3 



G9 



J9 



K9 



L7 



L8 



L9 



LIO 



1.1 acre... 



A3 



AlO 



C2 



D2 



E 1 



E2 



Fl 



0.7 acre. . . 



Vegetation in order of abun- 

 dance. 



Soil No. 24, stony clay — Cont'd 



M, Lot, Vic, Sit, F, Er 



F, M.Vic 



Vic, Lot, M, F 



F, M, Vic, Lup 



M, Vic, Sit, Lot, F 



F.M, Lot, Vic, Sit 



M, Lot, Vic, F, Sit 



M, F. Lot, Vic 



Lot, M, Vic 



Total 



Per acre 



Soil No. 20, fine clay: 



F, Vic, Lup, Sit 



F, Vic 



F (almost pure) 



F (almost pure), Vic, Lup.. 



r,M,Vie 



F (very rank), Ann, Vic 



F,M, Lot 



Total 



Per acre 



Num- 

 ber of 

 seed- 

 lings. I 



37 

 8 

 11 

 13 

 53 

 45 

 21 

 14 

 34 



287 

 261 



Summary of sample plots 3a and 3b. 



Son. 



Acres. 



Number of seedlings. 



Total. 



Per acre. 



No. 12, rock outcrop . . . 

 No. 6, very stony clay . 



No. 24, stony clay 



No. 9, graveUy clay 



No. 20, fine clay (deep) 

 No. 28, shallow clay. . . 



1.5 



.7 

 1.0 



.5 



176 

 444 

 355 

 96 

 36 

 32 



367 

 493 

 237 

 137 

 36 

 64 



Reproduction in various types of soil. — It should be noted that 

 the groups of plots in Table 10 are arranged in the order of the rela- 

 tive amounts of stone or gravel contained. A possible exception may- 

 occur in the case of Nos. 20 and 28, the latter of which is usually 

 somewhat the more gTavelly. It should also be borne in mind that 

 all of these soils are distinctly clayey. The varying degrees of 

 loaminess referred to in the descriptions apply only to a surface 

 layer varying from 2 to 12 inches deep, or in rare cases slightly 

 deeper. The seedling counts leave no doubt as to the favorable 

 infliience of rock or gravel. Since practically all of the seedlings 

 were over 3 years old and the majority over 5 years old at the time 

 of the examination, the data should furnish a reliable index as to 

 ultimate survival on the various soils. 



There also seems to be a definite relation between soil, reproduc- 

 tion, and herbaceous vegetation. Where Festucd arisomca is dis- 



