Study on Improvement Effect of Compound Improvers on Salinized Soil at Low-lying Farmland in Ningxia Yellow River Irrigation Area

doi:10.11924/j.issn.1000-6850.casb2023-0258

Abstract

Abstract:

At some low-lying farmlands in Ningxia irrigation area, the groundwater level usually is relatively high, which leads to heavy soil salinization. Adding soil improvers in farmlands is one of the valid methods to solve the problem of soil salinization. To study the improvement effect of different amendments on saline-alkali soil at the low-lying farmland of Ningxia Yellow River Irrigation Area, a salinized farmland with low terrain and shallow groundwater depth at Nanliang farm in Yinbei area was improved by using different amendments. A total of 10 treatment groups were set up, including control group, single application of furfural residue, single application of desulfurization gypsum, compound application of furfural residue and desulfurization gypsum with different application amount. The study area was divided into several subareas, where applied different treatment groups of ameliorants, and planted helianthus annuus. The growth index and yield of helianthus annuus under different treatment groups were compared and analyzed, as well as the total salt content, salt ions and pH value of soil after harvest of helianthus annuus, and the optimal improvement scheme of salinized soil in this region was explored. The results showed that: in the surface soil, compared with the control group, the total salt content decreased significantly after the compound application of furfural residue and desulfurization gypsum. The salt content decreased by 10.44%, 10.14% and 0.88% under the different application amounts of low, medium and high, compared with the control group. Single application of furfural residue or desulfurization gypsum did not reduce the salinity significantly. In general, application of compound improvers of furfural residue and desulfurization gypsum had significant effects on reducing soil total salt content, sodium adsorption ratio, and increasing crop yield. The optimal mixture ratio of furfural residue and desulfurization gypsum was 7:3, and optimal application amount was 17960 kg/hm².

Key words: saline-alkali soil, furfural residue, desulfurization gypsum, compound ameliorant, total salt content, Ningxia Yellow River Irrigation Area

DOU Bingyan, JING Hefang, LI Chunguang, WANG Weihong, ZHANG Wensheng. Study on Improvement Effect of Compound Improvers on Salinized Soil at Low-lying Farmland in Ningxia Yellow River Irrigation Area[J]. Chinese Agricultural Science Bulletin, 2024, 40(7): 93-100.

Figures/Tables 8

References 23

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项目	盐分/(g/kg)	pH	机械组成/%			容重/(g/cm³)	离子组成/(g/kg)
项目	盐分/(g/kg)	pH	粉粒	砂粒	黏粒	容重/(g/cm³)	CO₃^2-	HCO₃^-	Cl^-	SO₄^2-	Ca²⁺	Mg²⁺	Na⁺	K⁺
测定值	5.65	8.09	57.71	27.46	14.82	1.62	0.06	0.26	1.20	1.57	0.67	0.46	1.26	0.18

项目	盐分/(g/kg)	pH	机械组成/%			容重/(g/cm³)	离子组成/(g/kg)
项目	盐分/(g/kg)	pH	粉粒	砂粒	黏粒	容重/(g/cm³)	CO₃^2-	HCO₃^-	Cl^-	SO₄^2-	Ca²⁺	Mg²⁺	Na⁺	K⁺
测定值	5.65	8.09	57.71	27.46	14.82	1.62	0.06	0.26	1.20	1.57	0.67	0.46	1.26	0.18

供试材料	pH	盐分/(g/kg)	密度/(g/cm³)	离子组成/(g/kg)								有机质/(g/kg)	CaSO₄·2H₂O/%
供试材料	pH	盐分/(g/kg)	密度/(g/cm³)	CO₃^2-	HCO₃^-	Cl^-	SO₄^2-	Ca²⁺	Mg²⁺	Na⁺	K⁺	有机质/(g/kg)	CaSO₄·2H₂O/%
糠醛渣	2.01	29.0	0.36	0	0	0.2	18.7	1.54	1.03	0.1	7.43	765.6	—
脱硫石膏	6.84	7.61	2.24	—	—	0.32	—	—	—	—	—	—	93.8

供试材料	pH	盐分/(g/kg)	密度/(g/cm³)	离子组成/(g/kg)								有机质/(g/kg)	CaSO₄·2H₂O/%
供试材料	pH	盐分/(g/kg)	密度/(g/cm³)	CO₃^2-	HCO₃^-	Cl^-	SO₄^2-	Ca²⁺	Mg²⁺	Na⁺	K⁺	有机质/(g/kg)	CaSO₄·2H₂O/%
糠醛渣	2.01	29.0	0.36	0	0	0.2	18.7	1.54	1.03	0.1	7.43	765.6	—
脱硫石膏	6.84	7.61	2.24	—	—	0.32	—	—	—	—	—	—	93.8

处理	土壤改良剂	改良剂类型	施用量/(kg/hm²)
CK	空白	—	0
T₁	脱硫石膏	加钙材料	12572
T₂	脱硫石膏	加钙材料	17960
T₃	脱硫石膏	加钙材料	23348
K₁	糠醛渣	调酸+含碳材料	12572
K₂	糠醛渣	调酸+含碳材料	17960
K₃	糠醛渣	调酸+含碳材料	23348
H₁	糠醛渣(70%)+脱硫石膏(30%)	二元混合	12572
H₂	糠醛渣(70%)+脱硫石膏(30%)	二元混合	17960
H₃	糠醛渣(70%)+脱硫石膏(30%)	二元混合	23348