The invention discloses a method of modifying Xinjiang
saline-alkaline soil, comprising the steps of S1, adding
coal cinder in water 2-5 times as heavy as the
coal cinder for soaking, screening to obtain large-particle
coal cinder, medium-particle coal cinder and small-particle coal cinder, as well as the rest of
fly ash; S2, deeply plowing the soil to 25-40 cm, and spreading the small-particle coal residue to the surface of the soil not plowed out; S3, mixing well the plowed soil with desulfurization
gypsum,
biochar and a water-holding agent to obtain modified soil; S4, mixing part by volume of the modified soil with the medium-particle coal cinder and the
fly ash to obtain medium soil; S4, mixing the rest of the modified soil with the large-particle coal cinder and the
fly ash to obtain top soil. The wastes, coal cinder and desulfurization
gypsum, are reused to modify
saline-alkaline soil, and the modifying cost is effectively lowered for the
saline-alkaline soil; by the aid of the
biochar and the water-holding agent, formation of
soil aggregate structure is accelerated, microbial ambient of the oil is improved, and saline-alkaline soil can be improved faster.