Michigan State University Extension
Soils & Soil Management - Fertilizer - 06109724
07/10/97

Introduction

N-P-K Fertilizers                                           
Extension Bulletin E-896, October 1990                      

by M.L. Vitosh                                              
Extension Specialist, Crop and Soil Sciences                

There are many grades and analyses of nitrogen (N),         
phosphorus (P) and potassium (K) fertilizers, but           
all can be grouped into three classes - liquids,            
solids and gaseous.                                         

There is nothing mysterious about different grades          
or types of fertilizers. For a particular grade,            
many fertilizers have the same chemical compounds           
and are used for the same basic purposes to                 
supplement the essential plant nutrients in the             
soil. Usually all that is needed to compare two             
fertilizers is the amount and the availability of           
plant nutrients in the material. This information is        
given an the label or bill of sale and is                   
guaranteed.                                                 

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This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension. Reprinting cannot be used to endorse or advertise a commercial product or company. This file was generated from data base F1 on 02/27/98. Data base F1 was last revised on 07/10/97. For more information about this data base or its contents please contact vitosh@msue.msu.edu . Please read our disclaimer for important information about using our site.