Soil conditioner based on biochar and ammoniated straw as well as preparation method and application thereof

The invention discloses a soil conditioner based on biochar and ammoniated straw as well as a preparation method and application thereof. The soil conditioner comprises the following components in parts by weight: 15 to 20 parts of biochar; 35 to 45 parts of ammoniated straw; 0.02 to 0.04 part of a fermentation strain; 5 to 10 parts of oil residue; 5 to 10 parts of mushroom dreg; 5 to 10 parts offruit residues; 0.6 to 0.8 part of urea; 1.8 to 2.2 parts of calcium sulfate; and 5 to 10 parts of pyroligneous liquor. The product can quickly increase the content of organic matters in soil and promote the formation of soil aggregates; a soil structure with reasonable texture is formed, the air permeability and water permeability of soil are improved, and rainwater infiltration and drainage ducts in trench soil are established; the soil conditioner can balance ions such as carbonate ions and bicarbonate ions in soil, reduce the pH of the soil and improve the soil fertility of newly-built land, and also has the effec