Page 418 - Demo

422 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGYTable 2. Quality of Organic Fertilizer After TreatmentNo Indicator Unit Result QCVN 01-189:2019/BNNPTNT1 Organic matter % 25.35 %u2265152 Moisture % 25.12 -3 pH 7.5 -4 C/N - 20.4 -5 As mg/kg ND %u226410.06 Hg mg/kg ND %u22642.07 Pb mg/kg ND %u2264200.08 Cd mg/kg ND %u22645.09 E. coli MPN/g ND %u22641.1 x 10310 Salmonella MPN/g ND ND Note: ND: Not detectedTable 2%u2019s analytical data reveals that the organic matter content reached 25.35%, the C/N ratio was low, and heavy metals and microorganisms were not detected in the final product. Therefore, the organic fertilizer produced from agricultural by-products meets the quality standards outlined in the fertilizer quality regulations (National Technical Regulation on Fertilizer Quality-QCVN 01-189:2019/BNNPTNT[15]). Furthermore, a significant difference in nutrient content was observed in rice straw before and after treatment with microbial preparations.Table 3. Nutrient content of rice straw before and after treatment with microbial preparationsNo SampleIndicatorTotal N Total P2O5 Total K2O C/N1 Straw and chaff not treated with microbial preparations 0.63 0.31 1.34 52.92 Straw and chaff treated with microbial preparations 1.55 1.14 4.02 20.4