Effects of Combined Application of Organic-inorganic Amendments on Coastal Saline Soil and Growth of Mesembryanthemum crystallinum L.

doi:10.11924/j.issn.1000-6850.casb2025-0355

Abstract

Abstract:

Saline and acid combined stress represents a major constraint for agricultural production and coastal saline soil utilization in South China. This study investigated the synergistic effects of combined organic and inorganic amendments on the physicochemical properties of coastal saline soils and the growth of Mesembryanthemum crystallinum L., aiming to provide theoretical insights for the efficient remediation of coastal saline soils and cultivation of salt-tolerant crops. Using coastal saline soil and M. crystallinum, a pot experiment was conducted to compare three treatments: control, 0.1% soil conditioner, and combined 0.05% calcium-magnesium-phosphate fertilizer + 0.05% organic fertilizer. Amendments were evaluated for impacts on soil salinization, acidification, plant growth and stress resistance. The results showed that the 0.1% soil conditioner treatment increased soil pH by 2.68 units but showed no significant effects on soil electrical conductivity, total salt content, Na⁺ concentration, M. crystallinum biomass or stress resistance. In contrast, the combined application of calcium-magnesium-phosphate fertilizer and organic fertilizer increased soil pH by 2.15 units, reduced exchangeable Al³⁺, exchangeable H⁺, total exchangeable acidity and hydrolytic acidity by 85.3%, 87.9%, 86.0% and 59.5%, respectively, decreased soil electrical conductivity, salt content, and Na⁺ by 21.0%, 20.9%, and 31.0%, and increased soil available P concentration by 116%. Additionally, it enhanced the shoot fresh weight of M. crystallinum by 174%, reduced leaf malondialdehyde content by 37.0%, and increased root tip number by 42.8% compared to CK. Redundancy analysis identified soil available P, available K, and Na⁺ as key drivers of M. crystallinum growth in coastal saline soils. While soil conditioner alone alleviated acidification, its efficacy against saline-acid stress was limited. The combination of calcium-magnesium-phosphate fertilizer and organic fertilizer synergistically improved soil physicochemical properties (elevating pH, reducing salinity, mitigating Na⁺ toxicity, elevating available P) and optimized root morphology, significantly enhancing M. crystallinum stress resistance and yield. This integrated approach outperforms single amendments in suppressing soil acidification and salinization, offering an effective strategy for the sustainable coastal saline soil utilization.

Key words: organic modifiers, inorganic modifiers, Mesembryanthemum crystallinum L., saline soil restoration, seashore saline soil, Guangdong Province

LIU Yang, LIU Chong, XU Peizhi, WANG Dan, XIE Kaizhi, LI Yaying, ZHANG Kun, SUN Lili, LI Wanling, GU Jun, GU Wenjie, LU Yusheng. Effects of Combined Application of Organic-inorganic Amendments on Coastal Saline Soil and Growth of Mesembryanthemum crystallinum L.[J]. Chinese Agricultural Science Bulletin, 2025, 41(21): 123-130.

Figures/Tables 8

References 31

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指标	有机质/ (g/kg)	碱解氮/ (mg/kg)	有效磷/ (mg/kg)	速效钾/ (mg/kg)	电导率/ (mS/cm)	全盐量/ (g/kg)	钠离子/ (g/kg)
对照	22.2±1.06 a	138±22.9 a	9.57±4.46 b	427±46.2 a	4.72±0.23 a	7.08±0.53 a	1.84±0.0839 a
0.1%调理剂	22.7±1.05 a	125±6.57a	9.65±2.90 b	373±33.0 b	4.73±0.94 a	6.76±1.19 ab	2.00±0.350 a
0.05%钙镁磷肥+0.05%有机肥	23.2±0.81 a	118±15.5 a	18.6±2.29 a	234±13.0 c	3.73±0.68 b	5.60±1.18 b	1.27±0.230 b

指标	有机质/ (g/kg)	碱解氮/ (mg/kg)	有效磷/ (mg/kg)	速效钾/ (mg/kg)	电导率/ (mS/cm)	全盐量/ (g/kg)	钠离子/ (g/kg)
对照	22.2±1.06 a	138±22.9 a	9.57±4.46 b	427±46.2 a	4.72±0.23 a	7.08±0.53 a	1.84±0.0839 a
0.1%调理剂	22.7±1.05 a	125±6.57a	9.65±2.90 b	373±33.0 b	4.73±0.94 a	6.76±1.19 ab	2.00±0.350 a
0.05%钙镁磷肥+0.05%有机肥	23.2±0.81 a	118±15.5 a	18.6±2.29 a	234±13.0 c	3.73±0.68 b	5.60±1.18 b	1.27±0.230 b

指标	pH	HCO₃^-/ (mg/kg)	交换性铝(⅓Al³⁺)/ (cmol/kg)	交换性氢(H⁺)/ (cmol/kg)	交换性酸总量(⅓Al³⁺+H⁺)/ (cmol/kg)	水解性酸/ (cmol/kg)
对照	3.90±0.10 c	72.1±3.28 b	1.56±0.05 a	0.58±0.10 a	2.14±0.13 a	7.21±0.21 a
0.1%调理剂	6.58±0.13 a	82.7±5.69 a	0.08±0.03 c	0.08±0.01 b	0.15±0.03 c	2.20±0.17 c
0.05%钙镁磷肥+0.05%有机肥	6.05±0.18 b	81.8±6.80 a	0.23±0.04 b	0.07±0.01b	0.30±0.04 b	2.92±0.29 b

指标	pH	HCO₃^-/ (mg/kg)	交换性铝(⅓Al³⁺)/ (cmol/kg)	交换性氢(H⁺)/ (cmol/kg)	交换性酸总量(⅓Al³⁺+H⁺)/ (cmol/kg)	水解性酸/ (cmol/kg)
对照	3.90±0.10 c	72.1±3.28 b	1.56±0.05 a	0.58±0.10 a	2.14±0.13 a	7.21±0.21 a
0.1%调理剂	6.58±0.13 a	82.7±5.69 a	0.08±0.03 c	0.08±0.01 b	0.15±0.03 c	2.20±0.17 c
0.05%钙镁磷肥+0.05%有机肥	6.05±0.18 b	81.8±6.80 a	0.23±0.04 b	0.07±0.01b	0.30±0.04 b	2.92±0.29 b

处理	总根长/cm	根表面积/cm²	平均直径/mm	根系体积/cm³	根尖数/个	分叉数/个	交叉数/个
对照	201 ± 28.1 a	12.9 ± 1.78 b	0.204 ± 0.011 b	0.066 ± 0.0104 b	787 ± 97.1 b	1111 ± 194 a	275 ± 72.7 a
0.1%调理剂	240 ± 18.3 a	18.1 ± 0.54 a	0.242 ± 0.024 a	0.1097 ± 0.0137 a	1135 ± 73.7 a	1451 ± 56.4 a	308 ± 21.8 a
0.05%钙镁磷肥+0.05%有机肥	247 ± 28.7 a	16.2 ± 2.26 ab	0.208 ± 0.015 ab	0.0843 ± 0.0156 ab	1124 ± 144 a	1411 ± 215 a	380 ± 62.1 a