The use of deinking paper sludge (DPS) as a fertilizer instead of sending it to landfill could play a role in reducing greenhouse gases and improving soil properties. The objectives of this study were (1) to evaluate the changes in the physical (permeability and structural stability), chemical (particularly soil pH), and biological (microbial metabolic quotient (qCO₂), microbial biomass soil CO₂ emissions) of a calcareous agricultural soil following two successive annual amendments with three treatments (0, 30, and 60 Mg DPS ha⁻¹—control, DPS30, and DPS60, respectively); and (2) to determine whether the addition of N-fertilizer to these treatments (controlF, DPS30F, and DPS60F, respectively) causes changes to soil fertility. The DPS application increased soil organic matter (+0.80%: DPS60 vs. control; and +0.35%: controlF vs. DPS60F), available phosphorus (+23.14 mg kg⁻¹: DPS60 vs. control; and +14.34 mg kg⁻¹: DPS60F vs. controlF), potassium (+0.6 g kg⁻¹: controlF vs. DPS30F), and calcium (+0.28 g kg⁻¹: DPS60 vs. control). The 60 Mg DPS ha⁻¹ rate improved permeability and structural stability, regardless of the presence or absence of N-fertilizer. On the other hand, the 60 Mg DPS ha⁻¹ rate without N-fertilizer lead to a decrease in total mineralization rate and qCO₂, thereby indicating a reduction in CO₂ emissions. The rate of 60 Mg ha⁻¹ DPS could be effectively used to enhance the permeability and stability (soil restoration) and mitigate CO₂ emissions, whereas the 30 Mg ha⁻¹ rate could be used as fertilizer to improve the fertility of calcareous soils.

中文翻译：

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每年使用脱墨纸浆污泥后，石灰性土壤的CO2排放和肥力参数的变化（突尼斯）

使用脱墨纸污泥（DPS）作为肥料，而不是将其发送到垃圾填埋场，可以起到减少温室气体和改善土壤特性的作用。这项研究的目的是（1）评估甲壳动物的物理（渗透性和结构稳定性），化学（尤其是土壤pH）和生物（微生物代谢商（qCO ₂），微生物生物量土壤CO ₂排放）的变化。钙质农业土壤经过两次连续年度修正，并经过三种处理（0、30和60 Mg DPS ha ^-1—分别为control，DPS30和DPS60）；（2）确定在这些处理中分别添加N肥料（分别为controlF，DPS30F和DPS60F）是否会引起土壤肥力的变化。DPS施用增加了土壤有机质（+ 0.80％：DPS60与对照； + 0.35％：controlF与DPS60F），有效磷（+23.14 mg kg ^-1：DPS60与对照相比；和+14.34 mg kg ^-1：DPS60F与对照F），钾（+0.6 g kg ^-1：对照F与DPS30F对比）和钙（+0.28 g kg ^-1：DPS60与对照相比）。60 Mg DPS ha ^-1比率提高了渗透性和结构稳定性，而与是否存在N肥料无关。另一方面，60 Mg DPS ha ^-1如果不使用氮肥，则导致总矿化速率和qCO ₂降低，从而表明CO ₂排放量减少。60 Mg ha ^-1 DPS的比率可以有效地用于提高渗透性和稳定性（土壤恢复）并减轻CO ₂排放，而30 Mg ha ^-1的比率可以用作肥料，以改善石灰性土壤的肥力。