Storing liquid fertilizer in a poly tank can sometimes end up being a longer period of time then you planned. This is often because you pre-ordered your fertilizer and got an early delivery or, you ordered to much. This is not an issue if you have the right tank to store it. A lot of farmers and growers have questions about the strength of poly tanks for there liquid fertilizer. Understanding what poly tanks are made from and how they compare with other materials is important.