Koch and Phospholutions expand access to RhizoSorb 8-39-0 phosphate fertilizer

Koch Agronomic Services (KAS) and Phospholutions have signed an agreement to expand access to RhizoSorb 8-39-0, an enhanced-efficiency granular phosphate fertilizer, according to a company release dated November 9, 2026.

The product’s mineral-based technology controls the release of phosphorus from within the granule. The companies say that keeps more applied phosphorus available for crop uptake, rather than tied up in the soil. RhizoSorb can be blended and applied with standard dry fertilizer equipment and fits into existing fertility programs.

The companies say RhizoSorb was tested in more than 700 research and on-farm trials and can maintain or improve yields with up to 50% less applied phosphorus than standard grower practices. The release does not name the crops, soils or regions behind that comparison, and it does not give the trial methods. It also says the product was adopted on more than one million acres in the United States and Canada in the 2026 crop year. Those figures are company claims and have not been independently verified.

KAS will begin offering RhizoSorb in select geographies immediately, with product available for application in 2027. The release does not disclose financial terms. Growers and retailers can contact their local KAS representative.