DRAFT UGANDA STANDARD  
  DUS 759 
Second  Edition  
2017 -mm-dd 
 
 
 Reference number  
US 759: 2017 
© UNBS 2017   
  
Monoammonium phosphate (MAP) and Diammonium phosphate  
(DAP) fertilizers — Specification  
 US 759: 2017  
ii © UNBS 2017 – All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2017   
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Web: www.unbs.go.ug  US 759:2017  
© UNBS 2017  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Requirements  ................................ ................................ ................................ ................................ .........  1 
4.1 General requirements  ................................ ................................ ................................ ...........................  1 
4.2 Specific requirements  ................................ ................................ ................................ ...........................  2 
4.3 Heavy metal contaminants  ................................ ................................ ................................ ...................  2 
5 Packaging  ................................ ................................ ................................ ................................ ...............  2 
6 Weights and Measures regulations  ................................ ................................ ................................ ..... 2 
7 Labelling  ................................ ................................ ................................ ................................ .................  2 
8 Sampling  ................................ ................................ ................................ ................................ ................  3 
Bibliography  ................................ ................................ ................................ ................................ ........................  4 
 US 759: 2017  
iv © UNBS 2017 – All rights reserved  
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade , Industry and 
Cooperatives established under Cap 327 , of the Laws of Uganda , as amended .  UNBS is mandated to co -
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT  Agreement  of the World Trade Organisation (WTO).  
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of key stakeholders 
including government, academia, consumer groups, private sector and other inter ested parties.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
The committee responsible for this document is Technical Committee UNBS/TC 2, Food and agriculture , 
Subcommittee SC 2 0, Agrochemicals and veterinary drugs . 
This second  edition cancels and replaces the first edition ( US 759:2007), which has been technically revised.  
 UGANDA STANDARD  US 759: 2017  
 
© UNBS 2017  – All rights reserved  1 
 Monoammonium phosphate (MAP) and D iammonium 
phosphate (DAP) fertilizers — Specification  
1 Scope   
This Draft Uganda Standard specifies the  requirements, sampling and  tests methods for Monoammo nium 
phosphate (MAP) and Diammonium phosphate (DAP) fertilizers  
2 Normative references   
The following  documents are referred to in the text in such a way that some or all of their content constitutes 
requirements of this document. For dated references, onl y the edition cited applies. For undated references, 
the latest edition of the referenced document (including any amendments) applies.  
AOAC 950.01, Water (Total) in fertilizers  
ISO 5316 , Fertilizer — Extraction of water -soluble phosphates  
ISO 8157 , Fertiliz ers and soil conditioners —Vocabulary  
ISO 8397 , Solid fertilizers and soil conditioners — Test sieving  
ISO 8633,  Solid fertilizers — Simple sampling method for small lots  
ISO 8634,  Solid fertilizers — Sampling plan for the evaluation of a large delivery  
ISO 17318 , Fertilizers and soil conditioners —Determination of arsenic, cadmium, chromium, lead and mercury 
contents  
ISO 25475,  Fertilizers — Determination of ammoniacal nitrogen  
3 Terms and definitions   
For the purposes of this standard, the  terms and  definitio ns given in ISO 8157, Fertilizers and soil 
conditioners ─Vocabulary  apply.  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  
4 Requirements  
4.1 General requirements  
a) The fertilizer shall be fre e flowing, granular and free from  dust, cakes , lumps or any  foreign matter ; 
and  
2 © UNBS 2017  – All rights reserved  
 b) 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  when tested in a ccordance with ISO 
8397 . 
4.2 Specific requirements  
The fertilizers shall comply with the compositional limits specified in Table 1.  
Table 1 — Compositional limits for (MAP) and (DAP) fertilizers  
 
4.3 Heavy metal contaminants  
The heavy metal contaminants, if present, shall not exceed the limits stipulated in Table 2  
Table 2 — Heavy metal contaminants limits  
Sn. Parameter  Limits in  mg/kg  Test method  
i) Arsenic, As, max.  20.0 
ISO 17318  ii) Cadmium, Cd, max.  15.0 
iii) Mercury, Hg, max.  0.1 
v) Lead, Pb, max.  30.0 
vi Chromium, Cr. m ax. 500.0  
 
5 Packaging  
Monoammonium phosphate (MAP) and Diammonium phosphate (DAP) fertilizers  shall be packaged in 
materials that ensure the product integrity and quality and prote ct it against physical damage, chemical and 
moisture contamination.  
6 Weights and Measures regulations  
The fill of the package shall comply with the weight s and measures act  
7 Labelling  
The following information shall be clearly and indelibly marked  in Eng lish on each package or container : SN Characteristic  Requirement/limits  
Test method  
MAP  DAP  
i) Ammoniacal  nitrogen, % (m/m), min.  11 18 ISO 25475  
ii) Water soluble phosphates as P 2O5, % (m/m), min.  44 41 ISO 5316  
iii) Available phosphates, as P 2O5, % (m/m), min.  50 46 ISO 6598  
iv) Moisture, % (m/m), max.  1.5 1.5 AOAC 950.01  US 759: 2017  
© UNBS 2017  – All rights reserved  3 
 a) name of the fertilizer as  “MAP or DAP ”; 
b) name, address and physical location of manufacturer/packer/importer ; 
c) the guaranteed percentage (by weight) of nutrients reported as: Ammoniacal Nitrogen (N), Available 
Phosphates (P 2O5); 
d) date of manufacture;  
e) expiry date ;  
f) batch/lot number ; 
g) the net weight of the fertilizer in the package; in metric units ; 
h) storage and h andling instructions ; 
i) instructions  for use ; 
j) disposal instructions  and; 
k) country of origin.  
8 Sampling  
Sampling shal l be done in accordance with ISO 8633 and ISO 8634   
4 © UNBS 2017  – All rights reserved  
 Bibliography  
[1] US 759: 2007, Monoammonium phosphate (MAP) and Diammonium phosphate (DAP) fertilizers — 
Specification  
[2] FAO Mineral fertilizer Specifications 2010   
[3] Agricultural Chemicals (Control) Act,  2006 (Act No.1 of 2007)  
[4] The Fertilizer Control Regulations, 2010  
 US 759: 2017  
© UNBS 2017  – All rights reserved  5 
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordance with the 
certific ation mark scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 US 759: 2017    
 
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© UNBS 2017– All rights reserved