What is the ruling on purchasing fertilizer on credit for a price higher than its cash price, knowing that farmers do not possess its current price and payment is made upon selling the crop?

It is permissible to purchase a commodity on credit at a higher price than its cash price, provided that the conditions of sale are met, such as agreeing on the payment method before the contract to avoid two sales in one transaction, that the sold item is permissible and owned by the seller or his agent, and that the credit term is specified.