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

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 Ca2+, Mg2+ bond bridge and CaCO3, MgCO3 salt bridge and adhesion of SiO2, Fe2O3, Al2O3 as well as the other amorphous substances from the functional fertilizers.

The Potential for Restoring the Activity of Oxidoreductases and Hydrolases in Soil Contaminated with Petroleum Products Using Perlite and Dolomite

“…Macroaggregates are formed by two types of bridges: Ca 2+ and Mg 2+ binding and salt bridges (CaCO 3 , MgCO 3 ). Al 2 O 3 , Fe 2 O 3 , and SiO 2 also play an important role in this process [112]. This explains the preferential adsorption of higher molecular weight petroleum products [113].…”

Microbiome and transcriptome analyses reveal the influence of calcined dolomite application on Eriocheir sinensis in a rice–crab co-culture system

“…As it is relatively inexpensive and simultaneously provides Ca and Mg, dolomite has been widely used in agriculture in China in the recent years 12 , 13 . Calcined dolomite is better than uncalcined dolomite in improving soil acidity 14 . After dolomite is calcined, the CaCO 3 and MgCO 3 in the ore are transformed into CaO and MgO, which react with soil water to produce Mg(OH) 2 and Ca(OH) 2 .…”

Impact of dolomite rock waste on soil acidity and absorption of Ca and Mg by barley and wheat

“…Beside of neutralizing soil acidity, some positive effects of dolomite materials are their ability to remove some potentially toxic metals (Cu (2+) and Pb (2+)) from aqueous solution (Palansooriya et al, 2020;Pehlivan et al, 2009;Tangviroon et al, 2020;Trakal et al, 2011), to increase stability of soil aggregates (Zhan et al, 2022), to improve agrochemical properties of soil (Wu et al, 2021) and nutrition of crops (Serrano et al, 2020).…”