Agriculture grade super absorbent polymer consists of a set of polymeric chains that are parallel to each other and regularly linked to each other by cross-linking agents, thus forming a network.
When water comes into contact with one of these chains, it is drawn into the molecule by osmosis. Water rapidly migrates into the interior of the polymer network where it is stored. That’s how super absorbent polymer powder turns to water gel.
As this water gel’s absorption ability is bigger than soil but less than roots of plants, the absorbed water by super absorbent polymer will be released to plants when it is dry.
Tips: the specific retention of agriculture SAP is 1.3-1.4 MPa and the specific retention of roots is about 1.6-1.7 MPa.