It should be noted that Rust and sodium nitrite were been produced during the reaction between the iron pipes and the fertilizer.
What is a chemical reaction?
Chemical reaction can be regarded as a process involving conversation of one or more substances, known as reactants, are converted to different substances known as products.
When iron pipes and the fertilizer which are reactants react together, then products of Rust and sodium nitrite is formed.
Learn more about chemical reaction at;
https://brainly.com/question/16416932
