NOVELTY - Preparation of soilless culture substrate involves removing damage and moth-eaten portion of apple, cutting into 8-10 mm thick fruit slices, soaking in traditional Chinese medicine solution for 30-40 minutes, pouring resultant product into a fermentation tank, mixing straw, wheat bran and chicken manure in a stirrer, adding resultant mixture to fermentation tank, adding heavy water, sealing, fermenting at 30-40 degrees C for 20-30 days, crushing peat, drying, adding biodegradable starch-based strong water absorbing material, mixing, adding lime and water, and adjusting pH value to 6-6.5.    USE - Preparation of soilless culture substrate used as breeding nutrition block and open field culture base fertilizer for vegetable, and flower and plant.    ADVANTAGE - The method enables economical and environmentally-friendly preparation of soilless culture substrate by avoiding resource waste.    DETAILED DESCRIPTION - Preparation of soilless culture substrate involves removing damage and moth-eaten portion of apple, cutting into 8-10 mm thick fruit slices, soaking in traditional Chinese medicine solution for 30-40 minutes, pouring resultant product into a fermentation tank, mixing straw, wheat bran and chicken manure in a stirrer, adding resultant mixture to fermentation tank, adding heavy water, sealing, fermenting at 30-40 degrees C for 20-30 days, crushing peat, drying at 40-60 degrees C, adding biodegradable starch-based strong water absorbing material, mixing, adding lime and water, and adjusting pH value to 6-6.5. The soilless culture substrate comprises 40-60 wt.% apples, 15-25 wt.% peat, 8-12 wt.% straw, 5-15 wt.% wheat bran, 8-20 wt.% chicken manure and 1-2 wt.% biodegradable starch-based strong water absorbing material. The biodegradable starch-based strong water absorbing material is prepared by stirring 5-9 kg acrylic acid and 26% sodium hydroxide solution, neutralizing, obtaining acrylic acid neutralization liquid with concentration of 60-90%, cooling to 20-40 degrees C, adding 0.5-2 kg corn powder and 0.1-0.2 kg peat powder, stirring for 20-50 minutes, adding 50-10 g initiator (potassium persulfate) and 10-30 g crosslinking agent (methylenebisacrylamide), stirring for 1-3 hours, adding 1200-2000 mL 25% aqueous ammonia, stirring for 10-30 minutes, processing resultant product into small blocks, drying in an oven at 80-100 degrees C, and crushing.