Which of the following phosphorus sources is in liquid form?

Ammonium Polyphosphate is a liquid phosphorus source, commonly used in agricultural applications due to its ease of handling and application. This compound is often found in liquid fertilizers, where it is utilized to supply phosphorus and nitrogen to crops in a readily available form. The liquid nature of Ammonium Polyphosphate allows for efficient use in drip irrigation systems or as a foliar spray, promoting better plant nutrient uptake.

In contrast to liquid sources, Monoammonium Phosphate, Superphosphate, and Triple Superphosphate are typically found in solid forms. These solid forms require more time and effort to apply and may not provide the same level of immediate availability to plants as liquid fertilizers. Understanding the forms of phosphorus sources is crucial for making informed decisions about nutrient management in crop production.