292 Journal of AgrictUtural Research voi. xv. No. s 



natural soils. A series was conducted with ^ocal sand, Greenville loam, 

 and clay, and mixtures of half and half of these. Later, another series 

 was conducted using more grades of mixtures. Owing probably to 

 weather conditions, the second series grew better as a whole than the 



DaC/ in p. p. m. of dry soil 



1-00 1.000 2D00 3.000 ^000 



sond-vofi 4a*^^S^liir^ 

 /oam-ioii 



sanV-60^ ^S>YSi^ii^iyW'^^^^^y^^^^^^ 



joQm-20'f,\^^yi:£f^^yKziKi/^^iy^^ 



5ar)d-7ot 

 loam- JO -^^ 



^ond-eci , 



loom -40 V- ^^i^^Kzy^iiy'^ 



foam- JO f. vcA^Iy^Iy<5^v^^y^^:^^ 



sand-'^or. 

 I com- 60 f, 



sand-^O"!/. , 



1 00m -701!. 



sond-zo-/. 



ham -60% ^vll;^^5!f^<?!Ay;'^:l^ 



'- ©@©€©©©@©CXX) 



loom-9ov^ 

 day- 10 "i 



clay- 20 % '^^z:^<i^iK:::^^^y^^y^^^^^ 



loom-eof. 

 cloy- 'Wf. 



/oQm-JO% I 

 day-so'f. 



loom- +0 ^. /^,r^r^,r^.r^,^git42^ 

 cloy- 60 < 



loom-JO'/, 

 day -70% 



loam-z6% 

 cloy — 60% 



loam-iQvC 

 day -90% 



• == onephnl •^™» =. o-iom-dry molter 



PiQ_ J.— Diagram showing the number of wheat plants up and the dry matter produced in 21 days in soils 

 containing sodium chlorid added in various concentrations. Soils maintained at an eqtiivalent moisture 

 content. 



first; but, since the figures are equally distributed, they can be placed in 

 one table for study. All soil was maintained at 20 per cent moisture on 

 the basis of the dry soil. The details of the experiment and the results 

 are shown in figures 2, 3, and 4. It is noticeable from the figures that 



