The main reason for increasing fertiliser prices in Australia is that farmers often produced fertiliser using hydrocarbons such as natural gas. Another reason is the difficulty in imports from China and Russia. For more details read this article: https://bit.ly/3Ffei8v by Entegra Signature Structures.
Fertiliser prices in Australia are currently very high due to production of fertliser using hydrocarbons such as natural gas and restrictions placed on exports by traditional overseas suppliers. Read this article to know more about the reasons and impact of this.