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There are two main types of agricultural hydrogels, each with its own purpose. Both are polyacrylamide (PAM) polymers, but the linear PAM is used primarily for the prevention of soil erosion, while the cross-linked PAM is used to absorb large quantities of water and then release it over time. The latter can be found in garden stores under the name of "super-absorbent crystals" or something similar. The effectiveness of linear PAM has been proven many times over the last several years, while the use of cross-linked PAM is under some debate, as certain soil and environmental conditions can force variable results.

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