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July 21, 2021 – Registration Open for the 2021 HPTA Annual Meeting
Phoenix, AX – Nov. 15 – 17, 2021

Hosted by corporate member: Bio Huma Netics, Inc.

May 2021 – Nutritional Chemical Definition / Meeting with EPA

January 2021 – Member News Update

November 25, 2020
EPA Updates Draft Guidance for Plant Regulator Label Claims, Including Plant Biostimulants
Yesterday, the EPA released a newly updated draft guidance document clarifying which biostimulants, biological substances, and mixtures, in addition to the associated product label claims, EPA considers plant regulators. Those deemed plant regulators are subject to regulation under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) as pesticides.

Because this guidance impacts humic substances, HPTA members are encouraged to read the document and submit a public comment directly to the open docket on the website.  The proposed changes to humic and fulvic acid could significantly impact the humic and fulvic acid industry. The updated draft guidance incorporates diverse and helpful changes made in response to stakeholder feedback received during the draft guidance’s initial comment period in 2019. EPA seeks inputs on those revisions, including the wording of certain plant and non-plant regulator claim examples.

The public comment period will be open for 30 days in docket EPA-HQ-OPP-2018-0258 at After carefully considering the comments received, EPA anticipates finalizing this guidance in January 2021.



The Humic Products Trade Association (HPTA) was established in 2010 as a non-profit trade organization with the primary purpose of advancing the commercial uses of humic products through scientific and regulatory cooperation. An integral part of this mission is to establish a clear standard for laboratory testing. A testing standard was explicitly needed to reduce customer and market confusion created by the various laboratory methods which had been used historically to qualify and quantify humic products.

A new or updated analytical procedure was sought, which would be an acceptable standard to guarantee humic product content and label claims within the market.  Thus, HPTA worked with the scientific community to develop and promote a repeatable analytical procedure that would quantify and qualify both humic acids and hydrophobic fulvic acids. The resulting HPTA test method was adopted by the Association of American Plant Food Control Officials (AAPFCO) and has recently been updated. The HPTA test method was also accepted by the International Organization for Standards (ISO), as standard ISO 19822.

All HPTA Members in good standing, as well as humic product manufacturers, are highly encouraged to apply for and use the HPTA Test Method Certification Seal.  Once compliance is verified, products may bear the Certification Seal on the label and will be listed on the official HPTA website ( as meeting the required standards.

March 2020
CDFA Approves use of HPTA Test Method Seal : 
HPTA members can now use the HPTA Test method and seal on products sold in California, provided the humic acid guarantee on the label is valid when also tested with the current CDFA method and follows the guidelines outlined in the January 16th letter from Dr. Dale Woods, CDFA Environmental Program Manager.  This decision applies only to the humic acid and does not include fulvic acid (yet).

July 2018 – ISO Approves HPTA Test Method as an International Standard

Humic & Fulvic Acids – Standardized Test Method Information


IMPORTANT DATES: 2021 Industry Meetings and Events

HPTA Board Meetings
Teleconferences/Zoom meetings
 are generally held the second Tuesday of the month at 2 p.m. Central time.
Upcoming meeting:  Tuesday, November 9, 2021 at 2:00 p.m. CDT.
HPTA Members in good standing, are welcome to attend.

20th Conference of the International Humic Substance Society (IHSS) 
August 15-20, 2021
Estes Park, CO

HPTA Annual Membership Meeting – Registration Open
November 15-17, 2021
Phoenix, AZ
Hosted by corporate member: Bio Huma Netics, Inc.

New Ag International 5th Biostimulant World Congress
Nov. 30-Dec.2, 2021
Miami, FL

Acres Eco-Ag Conference & Trade Show
Dec. 6-9, 2021
Cincinnati, OH

Journal of Soils and Sediments / Humic Products in Agriculture: Potential Benefits and Research Challenges – a Review

Biochar and Humic Substances: A Comparison

November 15, 2010,  HPTA Formation

Humic Products Trade Association Newsletters
HPTA 2019 Summer
Spring 2018
Spring 2017
Summer 2016
Summer 2015
December 2013
February 2013
September 2012
April 2012

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