Glyphosate in Soils*<BR>Average ½ life in soils is about 30 days with range of 5.7 to 40.9 days. <BR> <BR>Once in the soil, glyphosate is bound tightly by mostly non-organic soil components, particularly charged minerals such as aluminum and iron oxides (Borggaard and Gimsing 2008). <BR> <BR>Glyphosate is more tightly bound to soils than most other herbicides and competes for adsorption sites in soil with phosphate, so phosphate fertilizers can cause remobilization of glyphosate (Bott et al. 2011). In extreme cases, this phenomenon can result in phytotoxicity to plants from unbound glyphosate (greenhouse-soybean). <BR> <BR>Also, in very sandy soils without enough binding sites, glyphosate residues can cause phytotoxicity (Cornish 1992). (tomato transplants)<BR>*Source: Duke, S.O. 2020. Glyphosate: environmental fate and impact. Weed Science 68:201-207 <BR>