Do you know the difference between P and P2O5 or K and K2O? Understanding fertilizer forms can be key in interpretation of the peer reviewed literature and making decisions based on your own reports. Reminder:  Fertilizer grade shows % N – % P2O5 – % K2O. The three percentages are always in this order. I...Read More

We often hear that someone has a low salt fertilizer that is liquid. Many people associate salt with table salt. However, we know fertilizers do not contain sodium chloride. So what is a liquid fertilizer low in salt and what implications does that have? Defining Salt Let’s start by defining salt. A salt is a...Read More

Reprint From June 2003 Ward Letter. Ward Laboratories professionals often get questions about surface urea application and UAN solutions. Urea is a dry fertilizer that dissolves with water after application creating urease enzyme activity that is naturally present in all soils at some level. Urease enzyme converts urea to ammonia (NH3) and bicarbonate (HCO3) in...Read More