NOVELTY - Soil conditioner comprises 12.5-25 wt.% active humic acid, 5-11.5 wt.% chicken manure, 4-12 wt.% tobacco, 2.5-7.5 wt.% corn stalk, 3-9 wt.% straw, 5-11.5 wt.% straw coal, 5-12.5 wt.% sucrose filter mud, 1-6 wt.% calcium superphosphate, 1-4.5 wt.% urea, 2-6 wt.% potassium sulfate, 9-17.5 wt.% calcium magnesium phosphate, 0.5-2.5 wt.% manganese sulfate, 0.5-2.5 wt.% ferrous sulfate, 0.5-3 wt.% zinc sulfate, 0.5-2.5 wt.% ammonium molybdate, 2.5-7.5 wt.% boric acid, 0.5-4 wt.% bacterial foraging algorithm (BFA) agent and 1.5-4 wt.% bentonite.    USE - Soil conditioner used for southern red soil (claimed).    ADVANTAGE - The conditioner is organic nutrient humic acid-based with easily oxidized organic matter, reactive group and exchangeable magnesium, and improves acidic soil physical and chemical properties and soil quality of arable land, provides comprehensive and rational nutrition to crops, promotes crop growth and increases crop quality and yield and soil fertility conservation.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) preparation of soil conditioner comprising weighing raw materials; mixing chicken manure, tobacco, corn stalk, straw, straw coal and sucrose filter mud to get premixed material; mixing active humic acid, calcium superphosphate, urea, potassium sulfate, calcium magnesium phosphate, manganese sulfate, ferrous sulfate, zinc sulfate, ammonium molybdate, boric acid, BFA agent and bentonite, adding to premix material and fermenting naturally for 4-6 days to get fermented material I; sieving to more than 2 cm, crushing to less than 2 cm, fermenting with moisture content of 55-65%, carbon nitrogen ratio of 24-30, pH of 7-8, stacking height of 100-150 cm at more than 18 degrees C, heating to 50-60 degrees C, turning, then if temperature exceeds 65 degrees C, turning again and making surface and bottom of fermented material stack for 2-3 times until without any odor, light fragrance of ammonia, covered with white mycelium and carbon nitrogen ratio down to 15-20 to get fermented material II; and measuring and packaging; and    (2) application of soil conditioner comprises applying 400-100 kg soil conditioner per acre southern red soil.