KENYA STANDARD        KS 157: 201 9 
ICS 65.080  
  
 
 
 
 
 
 
 
 
 
 
 
 
Monoammonium phosphate (MAP) and 
Diammo nium phosphate (DAP) fertilizer  — 
Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
© KEBS 201 9   Sixth Edition          
           
 KS 157: 201 9 
 
ii  © KEBS 201 9 — All rights reserved  TECHNICAL COMMITTEE REPRESENTATION  
 
The following organizations were represented on the Technical Committee:  
 
Kenya Agriculture and livestock R esearch Organization  (KALRO)  
Government chemist  
Mea Lt d  
Amiran (K) ltd  
Chemagro Ltd.  
Yara East Africa  
Kenya Tea Development Agency . 
Kenya Plant Health Inspectorate Services (KEPHIS)  
Ministry of Agriculture, livestock and fisheries  
Osho Chemicals  Ltd 
Elgon chemical s   Ltd 
Toyota Tshusho  Fertilizers Africa  
University of Nairobi -Department of plant science and crop protection  
OCP Africa  
ICL Fertilizers  
Lachlan(K) Ltd  
Wanda Agriculture  
National Pota to Council of Kenya  
Kenya Industrial Research Institute  
Top serve East Africa  
Elgon(K) Ltd  
Kenya flower council  
Kenya Chemical society  
SGS(K) Ltd  
BASF Chemicals  
Twiga Chemicals  
Sanergy   Ltd  
SABIC   Ltd   
Kenya Bureau of Standards — Secretariat  
 
 
 
 
REVISIO N OF KENYA STANDARDS  
 
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published standards, addressed to the Managing Director, Kenya Bureau of Standards, are welcome.  
 
 
 
 
 
 
 
© Kenya Bureau of standards, 201 9 
 
Copyright:  Users are reminded that by virtue of Section 6 of the Copyright Act, Cap. 130 of the Laws of Kenya, copyright sub sists in all 
Kenya Standards and except as provided under Section 7 of this Act, no Kenya Standard may be reproduced, stored in a retrieval 
system in any form or transmitted by any means without prior permission in writing from the Managing Director.  
 
 
 KENYA STANDARD                     KS 157: 201 9 
ICS 65.080  
© KEBS 201 9— All rights reserved   iii  
 
 KS 157: 201 9 
 
iv  © KEBS 201 9 — All rights reserved   
 
 
 
 
 
 
 
 
 
 
 
 
 
Monoammonium phosphate (MAP) and 
Diammonium phosphate (DAP) fertilizers — 
Specifica tion 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
KENYA BUREAU OF STANDARDS (KEBS)  
 
Head Office:  P.O. Box 54974, Nairobi -00200, Tel.: (+254 020) 605490, 602350, Fax: (+254 020) 604031  
E-Mail: info@kebs.org,  Web:http://www.kebs.org   
 
Coast Region     Lake Region          Rift Val ley Region  
P.O. Box 99376, Mombasa -80100   P.O. Box 2949, Kisumu -40100        P.O. Box 2138, Nakuru -20100  
Tel.: (+254 041) 229563, 230939/40                Tel.: (+254 057) 23549, 22396        Tel.: (+254 051) 210553, 210555  
Fax: (+254 041) 229448    Fax: (+254  057) 21814  KENYA STANDARD                     KS 157: 201 9 
ICS 65.080  
© KEBS 201 9— All rights reserved   v Foreword  
 
This Kenya Standard  was prepared   by the Technical Committee on Fertilizers  and Soil 
Conditioners  under the gu idance of the Standards  Projects Committee, and it is in 
accordance with the procedures of the Kenya Bureau of Standards.  
 
 
During the review   of this standard the cadm ium limit was revised . Reference was made 
to the following document:  
 
Regulation(EU) 2019 of the European parliament and the Council of laying down rules of 
making available on the market of EU fertilizing pr oducts and amending   Regulations(EC) 
NO 1069/2009   and (EC) NO 1107/2009 and Repealing Regulation (EC)NO.2003/2003.  
Particularly  
 
 
Acknowledgement is hereby made fo r assistance derived from this source . 
  
KENYA STANDARD   KS 157: 201 9 
 
© KEBS 201 9 — All rights reserved    1  
 
Monoammonium phosphate (MAP) and diammonium ph osphate (DAP ) 
fertilizers  — Specification  
 
 
1 Scope  
 
This Kenya Standard specifies  the requirements and  prescribes the methods  of test for 
Monoammonium  phosphate (MAP) and Diammonium phosphate (DAP) fertilizers.  
 
2 Requirements  
 
2.1 Description   
 
The ferti lizer shall be free flowing, granular and free from any foreign matter.  
 
2.2 Physical  
 
Particle size: Not less than 90  % of the material shall pass through 4 mm IS sieve and be 
retained on 1 mm IS sieve. Not more than 5  % shall be below 1 mm size . 
 
2.3 Chemical  
 
The fertilizers shall com ply with the compositional limits specified  in Table 1.  
  
 
 
Table 1 — Compositional limits  for (MAP) and (DAP) fertilizers  
 
Sl no  Characteristic  Requirement/lim
its Test 
method  MAP  DAP  
i) Total nitrogen, % (m/m), min.  11 18 AOAC  
ii) Water soluble phosphates as P 2O5, % 
(m/m), min.  44 41 AOAC  
iii) Available phosphates, as P 2O5, % (m/m), 
min. 50 46 AOAC  
iv) Moisture, % (m/m), max.  1.5 1.5  AOAC  
 
a 
. 
 
 
 
 
2.4 Heavy metal contaminants   
 © KEBS 201 9 — All rights rese rved  
The heavy metal  contaminants, if pres ent, shall not exceed the limits stipulated in Table 2.  
 
Table 2 — Heavy metal contaminants limits  
 
 
 
 
 
 
 
 
 
 
 
 
 
3.0. Packaging    and labelling  
 
3.1 Packaging   
 
3.1.1  The fertilizer s hall be packaged in materials that ensure the product integrity and 
quality and protect it against physical damage, chemical and moisture contamination.  
 
3.1.2  The fill of the package shall comply with the Weight and Measures Act Cap. 513 of 
the Laws of K enya . 
 
3.1.3 The disposal of used package and condemned fertilizer shall comply with EMCA 
1999 No.8 of the disposal of solids and liquid wastes . 
 
3.2 Marking/l abelling  
 
Marking/labelling of fertilizer package shall include the following information:  
 
a) name and physical address of manufacturer/packer/importer;  
b) name of  the fertilizer, namely MAP or DAP fertilizer;  
c) guaranteed percentages of nutrient element nitro gen and available phosphates,  
i.e. N – P2O5 – K2O; 
d) date of manufacture ;  
e) expiry date;  
f) the net weight of the fertilizer in the package;  
g) lot number or batch number;  
h) handling    and storage  instructions;  
i) Country  of origin.  SL 
No. Parameter  Limits in ppm  Test method  
i) Arsenic, As, max.  20.0 a)AOAC (986-15) 
ii) Cadmium, Cd, max.  30.0 AOAC (986-15) 
iii) Mercury, Hg, max.  0.1 AOA C(986-15) 
iv) Selenium, Se, max.  1.0 AOAC (986-15 
v) Lead, Pb, max.  30.0 AOAC (986-15) 
vi Chromium, Cr. Max.  500.0  AOAC (986-15) 
a) Recent Association  of official Analytical chemists . 
  
 
  3 4 Certificate of analysis  
 
A certificate of analysis shall accompany each consignment.  
 
 
 
  
5. Sampling  
This shall be carried out as outlined  in the ISO standards listed below  
ISO 8633 -Solid fertilizers -- Simple sampling method for small lots  
ISO 8634 - Solid fertilizers -- Sampling plan for the evaluation of a large delivery