Soil capacity increasing agent prepared by active carbon and production method thereof

This invention relates to a kind of soil harbour-enlarge expand ing material prepared by active carbon. According to weight percentage, it includes: 5% to 10%active carbon, 30% to 40% clay, 10% to 20%potassium dihydrogen phosphate, 15% to 20%diammonium orthophosphate, 10% to 15% rape dregs, 1% to 3%urea, 1% to 2%macromolecule water conservation membrane, 10% to 18%crop blending culm. The preparation process: first rogue and grind active carbon till 1 mm below, via 20 order screening, blend with clay, air dry the adjuvant potassium dihydrogen phosphate, diammonium orthophosphate, rape dregs and crop blending culm, respectively shatter and grind to 1 mm below, via 20 order screening, then blending, whip uniformity, gain product by pelletization and packing. Each hectare earth can use 750 kg to 1500 kg. It can increase yield of cotton 10%upwards, advance moisture utilization efficiency 10% upwards, can take full advantage of spontaneousness rainfall at drought and semiarid region, preserve moisture and fertility