\vheat. Tlicv are not sliowii in their elementary >1;itc. Iiut in the 

 fi)rin (.)f faniiliai- ciiniixumds and in the case of tlioM' most iiii|iortant 

 to return to (he soil tlip form is that «ell adajited foi' this |iuri>ose. 



A&H Constituents.^) Nitrogen 



IN A BUNDLE OF WHEAT. 



Nitrogen 771 grains 



As A^'^■C■..iC 5u.,-TO-C Olilv'l-.-, 



Wi» «fl»i *f» ^» 



<3i,LiCA ; Ikon 0,- iDt 



W# ^t 





IB 



Li ML .MAQNtSIA 



lo; C|-,.r, . i IJo G»--ii 





Potash it-i' 



A»S....f,i,-,. f,-.- 



SOIL KXILArsTloN. 



Some of tlie plant foods are pi'eseut in very small amounts in many 

 soils. And of this small amount only a |)art is in Mich ^ furm that 

 plaiils can get it. Jf we raise crops ycjr after year and I'emove them 



