Straw-based amphoteric liquid manure controlled-release agent and application thereof

The invention discloses a straw-based amphoteric liquid manure controlled-release agent, which is prepared under a condition that wheat straws, acrylic acid, acrylamide and dimethyl diallyl ammonium chloride are used as raw materials and persulfate, cerium nitrate amine and sodium sulfite as composite initiators. The straw-based amphoteric liquid manure controlled-release agent has the characteristics of high water absorbency, wide pH value application range, strong salty ion concentration adjustment, long useful substance storage time, biodegradability and low cost, is very favorable for liquid manure control, and can be widely applied to agricultural moisture maintenance and/or fertilizer maintenance. Simultaneously, a preparation method of the straw-based amphoteric liquid manure controlled-release agent has the advantages of simple and direct process, low cost, economical efficiency, practicability and the like.