img PO Box 963, Spring Green, Wisconsin 53588
  • Follow us:
  • RSS

  • LinkedIn


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).

EPA issues Draft Guidance for Plant Regulator Label Claims, Including Plant Biostimulants
The public comment period is now closed and the comments are under review by the agencies.

December 2019
HPTA President, Russell Taylor met with representatives of the EPA in Washington, D.C. on Friday, November 22nd,  reviewing HPTA’s position and concerns with the EPA.  Overall, the discussion was well received and informative in nature.  Next steps and decisions are expected in 2020.

May 6, 2019
Recently the Environmental Protection Agency (EPA) issued a draft guidance document to better define Plant Biostimulants as regulated substances under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). HPTA members are encouraged to read the document and submit a public comment directly to the open docket on the website.

EPA Draft Guidance – In general, a draft guidance document is needed and welcomed by the biostimulant industry as a whole.  However, the proposed changes to humic and fulvic acid could significantly impact the humic and fulvic acid industry. The EPA Draft Guidance document is now open for public comments.   (Important Update: The EPA has extended the comment period to July 28, 2019Your voice matters!)

For additional information including how to register comments; please see this HPTA Member communication from Humic Products Trade Association President; Russell D. Taylor.
EPA issues Draft Guidance HPTA Comment

HPTA Member Exclusive:  Important supplemental documents can be found in the Members Area of  (If you are a current HPTA Member and need help with your login, contact

New Farm Bill lays the ground work for Humic Substances
Dec. 21, 2018 – Last week the US House of Representatives passed the Senate Farm bill. Included in the farm bill was key language laying the groundwork for defining “plant biostimulants” in the United States While there is still work to be done with the USDA, this piece of legislation will help provide the framework needed in the agriculture industry to define and shape the biostimulant industry and further the growth of humic substance sales.

Humic Products Trade Association Test Method
July 2018 – ISO Approves HPTA Test Method as an International Standard

Humic & Fulvic Acids – Standardized Test Method Information



World Ag Expo
February 11-13,2020
International Agri-Center
Tulare, California

HPTA Annual Membership Meeting
August 16-17, 2020
YMCA of the Rockies
Estes Park, Colorado
Registration information and details coming soon



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

Biochar and Humic Substances: A Comparison


HPTA Board Meetings: Teleconferences are generally held the second Tuesday of the month at 2 p.m. Central time.
Upcoming meeting:  Tuesday, March 10th, 2020 at 2:00 p.m. CT.
HPTA Members in good standing, are welcome to attend.

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

Click here to Opt In to receive FREE newletters and updates from HPTA.