4 INSI'K' TKiN (>K Fi:i; ril.lZKKS 



All iiii|i<irtant factor, whit-li as yet is an iiiiknowii (|iiantity. 

 is tlie aiiKKiiit of tliese materials wliit-h a .soil can sii|»|ily annu- 

 ally without <leterioration, since in the majority of soils there 

 is an altundance of these cum|»oun(ls in an insoluble comli- 

 tion. 



Id some sections of our state it has become the habit to 

 regard the soil as worn out, but it would be more accurate to 

 consider it temporarily exhausted and fully ca))able of regain- 

 ing its original strength. The most convenient remedy for 

 beginning its recovery is a good commercial fertilizer, which 

 should be acconi])anieil by good tillage and an increase in the 

 humws-content. 



