Investigation of differential levels of phosphorus fixation in dolomite and calcium carbonate amended red soil

Abstract

BACKGROUND The pH adjustment of acidic red soils with lime materials is beneficial for the reduction of phosphorus (P) fixation. However, the reasons for varying levels of P activation after adding different lime materials have not been fully investigated. Therefore, this study examined changes in soil labile P and P forms after phosphate application to calcium carbonate (CaCO3) and dolomite amended red soil during a 120‐day incubation period. Also change of P sorption properties in the amended soil samples from day 120 were examined through a sorption–desorption experiment. RESULTS The increase of soil H2O‐P and NaHCO3‐P in the CaCO3 and dolomite amended soil treatments was mainly ascribed to the decline of the NaOH‐P. However, when compared with the control treatment after 120 days, soil Olsen‐P significantly increased by 34% and 66% in the CaCO3 and dolomite treatments. The Hedley P fractionation results demonstrated that the CaCO3 application caused a notable increase of HCl‐P (stable Ca–P), which was 88.4% higher than that in the dolomite treatment. However, the formation of stable P was strongly suppressed in the dolomite treatment due to the presence of magnesium (Mg), which was identified by the negative relationship between M3‐Mg and HCl‐P. In line with these findings, P sorption–desorption work showed weaker P binding energy in the dolomite treatment relative to the CaCO3 treatment. CONCLUSION In terms of increasing P availability in red soil, this study suggests that dolomite should be used to substitute CaCO3 in order to reduce the soil P fixation. © 2021 Society of Chemical Industry.

Structural equation model was used to evaluate the effects of soil chemical environment, fertility and enzyme activity on eucalyptus biomass

“…It has been shown that long-term management practices such as inorganic fertilizer application and manual weeding can lead to negative impacts such as soil acidification, increased bulk weight and decreased soil fertility quality [ 44 ]. Soil acidification accelerates the fixation of free phosphorus elements in the soil [ 42 ], and soil compaction reduces the rate of carbon and nitrogen cycling in the stand [ 45 ], thus exhibiting a significant reduction in fast-acting nutrients in high-generation plantation soils. Studies have shown that soil enzyme activity is significantly associated with stand nutrient cycling and is involved in the mineralization process of organic matter [ 35 ].…”

The distribution, effectiveness and environmental threshold of soil aggregate phosphorus fractions in the sub‐alpine region of Southwest China

“…NaHCO 3 ‐Pi is adsorbed on the soil surface. NaHCO 3 ‐Pi is a highly active P in soil, which may make it enter water body and run‐off with rain easily, so it may be an important source of CaCl 2 ‐P (Fan et al, 2021; Wang et al, 2021) (Table 5). Uptake by plants and microorganisms results in relatively low concentrations of NaHCO 3 ‐Pi (Cassagne et al, 2000) (Figure 4).…”

“…NaHCO 3 -Pi is adsorbed on the soil surface. NaHCO 3 -Pi is a highly active P in soil, which may make it enter water body and run-off with rain easily, so it may be an important source of CaCl 2 -P (Fan et al, 2021;Wang et al, 2021) (Table 5).…”

Assessment of the effects of multigenerational succession on soil chemical environment, fertility and enzyme activity in Eucalyptus plantations using structural equation modeling

“…Soil acidification accelerates the fixation of free phosphorus elements in the soil [46], and soil compaction reduces the rate of carbon and nitrogen cycling in the stand [6], thus exhibiting a significant reduction in fast-acting nutrients in high-generation plantation soils. Studies have shown that soil enzyme activity is significantly associated with stand nutrient cycling and is involved in the mineralization process of organic matter [47]. Continuous planting significantly affected sucrase, urease, and acid phosphatase activities, and the decrease in the activities of these three enzymes indicated that the cycling of carbon, nitrogen, and phosphorus in the soil was blocked [48].…”