Biological water retention material, method for preparing same and use thereof

A method for preparing a water retention material, the method comprising:

• 1) adding bentonite, potassium humate, and thiourea to water to obtain a mixture;
• 2) adding a Bacillus subtilis GE1 powder mixture to the mixture to obtain a bacterial agent-bentonite-humic acid slurry for further use;
• 3) adding acrylic monomer into an agitator, stirring, slowly adding ammonia for neutralization to obtain a solution, adjusting the pH of the solution to 6-8, adding acrylamide to obtain a neutralization solution at the end of the neutralization, and adding the pH-adjusted neutralization solution into the bacterial agent-bentonite-humic acid slurry;
• and
• 4) adding a mixed cross-linking agent, adding ammonium persulfate or potassium persulfate as an initiator, then adding a redox initiation system consisting of NaHSO3 or urea and stirring to obtain a viscous mixture, and continuing the reaction to generate the water retention material,
• wherein:
• the water retention material is a brown gel-like elastic graft copolymer composite material;
• and
• the Bacillus subtilis GE1 has been deposited in China General Microbiological Culture Collection, Institute of Microbiology, Chinese Academy of Sciences on Jan. 7, 2016, with a deposit number of CGMCC No. 11964.