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Kang F, Meng Y, Ge Y, Zhang Y, Gao H, Ren X, Wang J, Hu S. Calcium-based polymers for suppression of soil acidification by improving acid-buffering capacity and inhibiting nitrification. J Environ Sci (China) 2024; 139:138-149. [PMID: 38105042 DOI: 10.1016/j.jes.2023.05.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 05/13/2023] [Accepted: 05/15/2023] [Indexed: 12/19/2023]
Abstract
Soil acidification is a major threat to agricultural sustainability in tropical and subtropical regions. Biodegradable and environmentally friendly materials, such as calcium lignosulfonate (CaLS), calcium poly(aspartic acid) (PASP-Ca), and calcium poly γ-glutamic acid (γ-PGA-Ca), are known to effectively ameliorate soil acidity. However, their effectiveness in inhibiting soil acidification has not been studied. This study aimed to evaluate the effect of CaLS, PASP-Ca, and γ-PGA-Ca on the resistance of soil toward acidification as directly and indirectly (i.e., via nitrification) caused by the application of HNO3 and urea, respectively. For comparison, Ca(OH)2 and lignin were used as the inorganic and organic controls, respectively. Among the materials, γ-PGA-Ca drove the substantial improvements in the pH buffering capacity (pHBC) of the soil and exhibited the greatest potential in inhibiting HNO3-induced soil acidification via protonation of carboxyl, complexing with Al3+, and cation exchange processes. Under acidification induced by urea, CaLS was the optimal one in inhibiting acidification and increasing exchangeable acidity during incubation. Furthermore, the sharp reduction in the population sizes of ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) confirmed the inhibition of nitrification via CaLS application. Therefore, compared to improving soil pHBC, CaLS may play a more important role in suppressing indirect acidification. Overall, γ-PGA-Ca was superior to PASP-Ca and CaLS in enhancing the soil pHBC and the its resistance to acidification induced by HNO3 addition, whereas CaLS was the best at suppressing urea-driven soil acidification by inhibiting nitrification. In conclusion, these results provide a reference for inhibiting soil re-acidification in intensive agricultural systems.
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Affiliation(s)
- Fei Kang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Yunshan Meng
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Yanning Ge
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Yun Zhang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Haixiang Gao
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China
| | - Xueqin Ren
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Jie Wang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
| | - Shuwen Hu
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
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Kang F, Lv Q, Fan J, Zhang Y, Song Y, Ren X, Hu S. Ameliorative effect of calcium poly(aspartic acid) (PASP-Ca) and calcium poly-γ-glutamic acid (γ-PGA-Ca) on soil acidity in different horizons. Environ Sci Pollut Res Int 2023:10.1007/s11356-023-27713-8. [PMID: 37222895 DOI: 10.1007/s11356-023-27713-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 02/19/2023] [Accepted: 05/13/2023] [Indexed: 05/25/2023]
Abstract
Soil acidification is a worldwide eco-environmental problem detrimental to plant growth and threatening food security. In this study, calcium poly(aspartic acid) (PASP-Ca) and calcium poly-γ-glutamic acid (γ-PGA-Ca) were obtained through cation exchange and used to mitigate soil acidity owing to high solubility and complexing capability. Three rates at 6.7, 13.4, and 20.1 g kg-1, denoted as PASP-Ca1, PASP-Ca2, and PASP-Ca3, and γ-PGA-Ca (7.4 g kg-1) were surface-applied and compared with conventional lime (CaCO3, 2.5 g kg-1) along with control in two soil layers (top soil 0-10 cm, subsoil 10-20 cm). After leaching, various soil properties and aluminum fractions were measured to assess their ameliorative performance and mechanisms. Although lime achieved the highest soil pH (6.91) in the topsoil followed by PASP-Ca and γ-PGA-Ca (pH: 5.57-6.33), it had less effect on subsoil increase (5.3) vs. PASP-Ca and γ-PGA-Ca (pH: 5.44-5.74). Surface-applied PASP-Ca demonstrated efficiency in elevating soil pH and reducing exchangeable acidity, mainly as exchangeable Al3+, whereas γ-PGA-Ca addition superiorly improved soil pH buffering capacity (pHBC). Moreover, PASP-Ca and γ-PGA-Ca addition improved organic carbon by 34.4-44.9%, available P by 4.80-20.71%, and cation exchange capacity (CEC) by 6.19-29.2%, thus greatly enhanced soil fertility. Ca2+ from polyAA-Ca promoted the displacement of exchangeable Al3+ or H+ from soil colloid, which were subsequently complexed or protonated and facilitated leaching. Additionally, the transformation into stable organo-aluminum fractions via complexation inhibited further hydrolysis. Under PASP-Ca or γ-PGA-Ca addition, the saturation of aluminum in cation exchange complex was reduced 2.91-7.81% compared to the control without addition amendments. Thus, PASP-Ca and γ-PGA-Ca can serve as potent ameliorants to alleviate soil acidity and aluminum toxicity for sustainable agricultural development.
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Affiliation(s)
- Fei Kang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-Control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193, Haidian, China
| | - Qilin Lv
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-Control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193, Haidian, China
| | - Jingbiao Fan
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-Control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193, Haidian, China
| | - Yun Zhang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-Control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193, Haidian, China
| | - Yuling Song
- Hekou District Agricultural and Rural Bureau, Yellow River Road 164Shandong Province, Dongying City, 257200, China
| | - Xueqin Ren
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-Control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193, Haidian, China
| | - Shuwen Hu
- Beijing Key Laboratory of Farmland Soil Pollution Prevention-Control and Remediation, College of Resources and Environmental Sciences, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193, Haidian, China.
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