Which chemical is often prohibited due to its toxicity in agricultural practices?

Arsenic is often prohibited in agricultural practices due to its high toxicity and significant health risks associated with exposure. It is a naturally occurring element that can contaminate soil and water, leading to serious environmental and human health issues, such as arsenic poisoning and long-term health conditions, including cancer.

In agriculture, the presence of arsenic in soil can adversely affect crops, and its uptake by plants can pose risks to consumers as well. Due to these dangers, regulations are in place to limit or ban the use of arsenic-containing compounds in farming, making it essential for farmers and agricultural producers to search for safer alternatives.

Other substances listed, such as calcium carbonate, potassium chloride, and ammonium nitrate, do not carry the same level of toxicity and are common in agricultural practices for various purposes, such as soil amendments, fertilizers, or essential mineral sources.