Method for preparing potassium- and nitrogen-containing high water-absorbent resin from carboxymethyl potato starch serving as raw material

The invention discloses a method for preparing potassium- and nitrogen-containing high water-absorbent resin from carboxymethyl potato starch serving as a raw material. The product is prepared from the carboxymethyl potato starch serving as the raw material; and the carboxymethyl potato starch is water soluble, so compared with starch serving as the raw material, the carboxymethyl potato starch does not need gelatinization, and the preparation process is greatly simplified. Compared with like products, the high water-absorbent resin prepared by the method has the advantages of high water absorbing and retaining capability and high gel strength, contains potassium and nitrogen necessary for plant growth, and has great effects of resisting drought and keeping seedlings, increasing both production and income, promoting plant growth and the like for the soil in arid regions.