I doubt you'll find any "agricultural chemicals" in your sheets - cotton is the "fluff" that sprouts around the plant seed heads at the end of the plants life - it's nearly pure natural cellulose, once it's processed to remove seeds, insect residue, protein, vegetable matter, and other impurities .... once it's made into cloth may be another story

the main reason for prefering organic anything is for it's "lighter footprint" on the earth

Bill

It's not just the agricultural chemicals (and I'm sorry but I don't have an answer for that). It's the chemicals used in the processing such as formaldehyde to give a no-iron finish and dyes (Europe has banned some azo dyes as carcinogens) and fungicides to protect the fabric during shipping.

One of the most important plants in record is pure cotton. Cotton is the most commonly used natural linens found in outfits products today, more than fleece coat or any other non-synthetic fabric.