Which phosphorus form is less readily available for plant uptake due to sediment binding?

The form of phosphorus that is less readily available for plant uptake due to sediment binding is particulate phosphorus. Particulate phosphorus refers to phosphorus that is bound to soil particles and organic matter, making it less accessible to plants. This binding occurs because these particles can settle out of the water column and become immobilized in sediment, which reduces the likelihood of plant uptake.

In contrast, reactive phosphorus is more soluble and can be readily taken up by plants. Fixed phosphorus is chemically bound to the soil matrix but is not typically sediment-bound in the same way as particulate phosphorus. Soluble phosphorus is available in a form that plants can easily absorb and utilize. Thus, among the options given, particulate phosphorus is specifically known for its association with sediment, leading to lower availability to plants.