Super absorbent polymer (SAP)

What is super absorbent polymer indeed?

In agriculture, super absorbent polymer is also called water retaining polymer or soil condition agent.

It is a powerful water absorbent material. The water absorption is hundreds times of it weight.

1. Appearance

Before absorbing: White (or brownness) powder / granule.
After absorbing: Transparent gel.

2.Chemical component

The mainly chemical component of SAP is sodium polyacrylate or potassium polyacrylate.

  • Sodium polyacrylate is produced by sodium hydroxide and acrylic acid;
  • Potassium polyacrylate is produced by potassium hydroxide and acrylic acid.

3.Function

SAP can increase the water holding capacity of soil which is meaning:

  • The yield of crops / fruit trees will be increased;
  • The water cost will be reduced;
  • The fertilizer efficiency will be increased by reducing lost to underground.

>> Water Holding Capacity Test

Is super absorbent polymer good for soil?

1.Potassium polyacrylate SAP

Potassium polyacrylate is totally good for soil:

  • Before decomposed in soil, it can keep increasing water holding capacity of soil;
  • After decomposed in soil, potassium polyacrylate would break into potassium, water, carbon dioxide, etc.

2.Sodium polyacrylate SAP

In agriculture, sodium polyacrylate obviously is a bad choose.

After decomposed in soil, sodium polyacrylate would be break into water, carbon dioxide and sodium which would cause soil alkalization.

Tips: As sodium polyacrylate is much cheap than potassium polyacrylate, profiteers would sell sodium polyacrylate instead of potassium polyacrylate.

Further Details