Is super absorbent polymer good for soil?

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.

sodium polyacrylate uses in agriculture

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.


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.