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The POLY4 cornerstones

Nutrient release profile

Impact on soil structure


POLY4 – a game-changing product

The POLY4 cornerstones

Sirius Minerals’ research and development programme

About polyhalite

POLY4 explained

Sirius Minerals polyhalite project development


Published at Africa Fertilizer event – Addis Ababa, February 2018

Published at the Fertilizer Added Value event – Madrid 2018

Published at the Fertilizer Latino Americano event – São Paulo 2018

Evaluation of polyhalite for its nutrient availability and accumulation in rice, sesame and peanut

POLY4 as a fertilizer for cotton in Virginia, USA

Effect of POLY4 on soil environments

Potato yield and dry matter response to different sources of potassium fertilizer in the UK

Response of tobacco to new fertilizer blends containing polyhalite in comparison to conventional blends in Tanzania

Response of wheat to polyhalite in Jiangsu, China

Published at the NPK Fertilizers event – Vietnam 2017


The added value of balanced fertilization with POLY4 – Added Value Fertilizers, Europe – February, 2018

The added value of balanced fertilization with POLY4 – Added Value Fertilizers, Europe – February, 2018

Improving NPKs through a simple multi-nutrient NPK feedstock, Fertilizer Latino Americano, Brazil – January 2018

The added value of balanced fertilization with POLY4, European Mineral Fertilizer Summit, Netherlands - December 2017

We're about POLY4, IFA Crossroads Asia-Pacific Conference, Singapore - October 2017

Characteristic features of POLY4 as a multi-nutrient fertilizer, ASA Conference, Florida - October 2017

Effect of polyhalite and MOP as K sources on the yield and nutrient uptake of maize in Sichuan, China, ASA Conference, Florida

POLY4 - a multi-nutrient fertilizer, Fertilizer Association of India Annual Summit - December 2017


Potato response to polyhalite as a K source fertilizer in Brazil: yield and quality, HortScience – March 2018

Evaluation of polyhalite in comparison to muriate of potash for corn grain yield in the Southern Highlands of Tanzania, International Scholars Journals – March 2017

Granulated polyhalite fertilizer caking propensity, Powder Technology – December 2016