Conventional super absorbent resin is less salt-tolerant. In practice

its application

particularly in agriculture

often results in the result far less than water absorbency measured in laboratory conditions. An experiment was conducted for a new kind of super absorbent resin performance in soil. Calcium lignosulfonate contains a large number of hydrophilic groups

such as sulfonic group

and carboxyl. Calcium lignosulfonate can not only reduce the cost of the water-absorbent resin

but also improve water absorbency. Results showed that water absorbency of the new water-absorbent resin was 230 g/g. Compared with the traditional super absorbent resin

water retention time was extended 10 days

water absorbency was increased by 50%

and soil permeability was increased. The new water-absorbent resin has a repeatedly absorbent function. At the same time

it has a good expansion and can reduce evaporation. Particularly

it plays important roles in enhancing soil available water-absorbency

increasing soil temperature

and improving soil permeability.