Soil Aggregate Construction: Contribution from Functional Soil Amendment Fertilizer Derived from Dolomite

Yaowei Zhan, Kaixin Jiang, Jiaquan Jiang, Lidan Zhang, Chengxiang Gao, Xiuxiu Qi, Jiayan Fan, Yuechen Li, Shaolong Sun and Xiaolin Fan ()
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Yaowei Zhan: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Kaixin Jiang: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Jiaquan Jiang: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Lidan Zhang: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Chengxiang Gao: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Xiuxiu Qi: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Jiayan Fan: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Yuechen Li: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Shaolong Sun: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Xiaolin Fan: College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China

Sustainability, 2022, vol. 14, issue 19, 1-15

Abstract: Elastic and water stable macroaggregate are significant to soil structure. which is the base of the soil, to maintain sustainable agriculture. Whether and how functional amendment fertilizer is capable of construction of the macroaggregate is the main purpose of the study. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to investigate the effect of dolomite-based functional soil amendment fertilizers on soil structure. The fertilizers are beneficial to elastic-stable and water-stable aggregate construction. Calcined dolomite based soil amendment functional fertilizer (CDFF) was favorable to water-stable aggregates. The elastic-stable macroaggregate increased with lime, uncalcined dolomite based soil amendment functional fertilizer (UCDFF) and CDFF, and it was 3.0 to 4.2 times the microaggregate. The water-stable one of the CDFF was increased by 20.0%. The mean weight diameter (MWD) of the CDFF and the UCDFF increased by 0.05~0.19 mm, while that of lime only increased by 0.05 mm. The percentage of aggregate dispersion (PAD) of the CDFF was the least. SEM and EDS images revealed that Fe, Al, Si, Ca, Mg, C and O existed on the aggregates. The construction of stable aggregate lies in that the functional fertilizers can gradually neutralize soil H + and prevent soil colloid dispersion. Soil particles are bounded together to construct micro-agglomerates and then macro-agglomerates through Ca 2+ , Mg 2+ bond bridge and CaCO 3 , MgCO 3 salt bridge and adhesion of SiO 2 , Fe 2 O 3 , Al 2 O 3 as well as the other amorphous substances from the functional fertilizers.

Keywords: dolomite; functional soil amendment fertilizer; elastic- and water stable aggregate; percentage of aggregate dispersion; salt bridge (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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