Michigan State University Extension
Soils & Soil Management - Fertilizer - 06209704
07/10/97

Availability to Plants

Fluid Fertilizers--Liquids and Suspensions                  
MSU Ag Facts                                                
Extension Bulletin E-933, December 1984, Revised,           
destroy previous editions                                   

by R. E. Lucas and M. L. Vitosh, Department of Crop         
and Soil Sciences                                           

Nearly all the active ingredients in fluid or dry           
fertilizers commonly sold are water- or citrate-soluble.    
Thus, they are equally available for plants. Though the     
fertilizer salt may be 100 percent water soluble, it may    
rapidly change to compounds of low water solubility after   
application to the soil. For example, a liquid fertilizer   
containing 100,000 ppm of phosphorus will likely test no    
more than 0.3 ppm in the soil solution after application.   

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