Preparation And Application Of HA Compound Fertilizer

This paper prepares humic acid (HA) compound fertilizer based on weathered coal, the results show that: 1) H₂O₂ oxides weathered coal is viable, when the concentration of H₂O₂ is 9%, the yield of HA acid is at the most. 2) weathered coal reacts with different mass fraction of NaOH under different conditions to determine the yield of NaHA, the optimum process conditions are: when the concentration of NaOH is 1.5-2%, the temperature is 85℃, the time is 75min, the yield of NaHA acid is at the most.In this thesis, the study was also conducted to determine the effects of HA compound fertilizer on soil fertility, nutrient release of soil, nutrient utilization and the growth of tomato. The result indicated: the humic acid fertilizer can increase yield obviously. When the amount of fertilizer is 10g/kg solid, the output is at the most.The humic acid fertilizer can improve the quality of tomato obviously. The test of grown in pot showed that: Compared with chemical fertilizer that has the same proportion of nutrient, the humic acid fertilizer can increase content of solubility sugar and lycopene of tomato. Also, the humic acid fertilizer can reduce the content of acidity.