The Regulation of Soil Organic Carbon Sequestration in Calcareous Soil by Long-Term Organic Amendments and Nitrogen Fertilization

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Abstract
There is compelling evidence that organic inputs encourage soil health and sustainable agriculture. Nonetheless, it is currently unclear how long-lasting organic additions in combination with chemical fertilizers affect soil macro aggregate production and the soil's ability to store organic carbon (SOC). Therefore, the research goal was to determine how after 14 years of fertilizing, there is interaction between soil carbon sequestration and soil aggregate. Seven interventions were used in a field trial. Farmer-applied nitrogen (N), improved N executives, bio-char and manure, straw, compost, biogas waste, or enhanced N management alone is chosen. The research showed that, increasing by 30.6-120.8% and 11.3-36.3% in the soil layers between 0 -16 cm and 16 - 31 cm, respectively. A indicator of the soil's carbon storage process, human carbon (HUC) was one of the soil's humus carbon pools that grew by 15.7 to 206.2% in the soil depth of 0–16 cm and between its high aromatic carbon concentration and biodegradation resistance, adding bio-char to the organic components was the most successful tactic. The concentrations of dissolved organic matter (DOC), particulate organic carbon (POC), and microbial biomass carbon (MBC) and - the oxidizable carbon (ROC) all increased on average by, 122.5%, 94.3%, 218.2%, and 87.5%, respectively. The amount of exchangeable , , and Fe, with soil Al oxides, the mean weight diameter (MWD),these indicators had a strong association. According to the findings, adding organic materials to calcareous soil could be a useful management technique for encouraging carbon retention and creating soil macro aggregates in the ground.

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