Protection method against rain erosion for soil slope improved by phosphogypsum and microbe

A method for protecting a soil slope from rain erosion by improving with phosphogypsum and a microbe, comprising the following steps:

• (1) placing Bacillus pasteurii in a culture medium to prepare a microbial solution, and mixing urea, calcium chloride and water to prepare a cementing solution;
• (2) mixing a mixture, the microbial solution and water well, and adding the cementing solution and water to prepare an improving mixture slurry;
• (3) leveling an excavated slope;
• constructing an intercepting ditch on a crest of the slope, a drainage ditch on a toe of the slope and a drainage groove on a face of the slope;
• laying and fixing a three-dimensional vegetation net on the face of the slope;
• and
• (4) spraying the improving mixture slurry by wet spraying to the face of the slope twice from top to bottom and left to right with a thickness of 4±1 cm each;
• then mixing the improving mixture slurry with grass seeds well, and spraying to the face of the slope once with a thickness of 4±1 cm;
• then covering with a non-woven fabric by tying and fixing, and watering every day.