296 Journal of Agricultural Research voi. xv. No. s 



the equivalents were sand 2.66 per cent, loam 23.92 per cent, clay 27.07 

 per cent, and peat 51.80 per cent; but the first results are probably as 



' DoCI in p. p.m. of'dry so// 



fOO I.QOO 2.000 3.000 4000 



no ^^^^f<^fi^^^'i^/^^^'^ 

 peat '^^^^'R^^y^uP^^^^^U^^^^^^^^ 



3% 

 pear 



109, 



peat \z::k:i:k^'^i^^^^i!}^ 



IS% 



peat 



- @@©@@^T@XS)0(X) 



• ■= one plant ^^•^ = o-i^m-drymaffcr 

 floj COj in p.p. m. of dry so// 



JOO 1000 J.000 5.000 7.0 00 IOi}00 



.r, @@©©OOOOCO(X) 



.s @^i©©©cax)oo 



peot 



10% 

 peat 



peat 



20% 

 peat 



• = oni plant ■^■— = 0^}m dry matter 



ria^SO^ /np.p.m. of dry soil 

 500 1.000 ipoo 5.000 7.000 10.000 



peat ^^\^?^^:y<l:y^.!;A::y 



peat _ 

 peat 



20% 

 peat 



»=on( plant — — o-igm.drymattcr 



Fig. 9.— Diagram showing the number of wheat plants up and the dry matter produced in 21 days in sand 

 with different amounts of peat containing sodium chlorid, sodium carbonate, and sodium sulphate added 

 in various concentrations. iMoisture content maintained at 20 per cent throughout. 



satisfactory for this experiment, since the sand at the lower moisture 

 content would be unworkable. The results of this experiment are 



