Saline soils and crop production in coastal zones of Vietnam: features, strategies for amelioration and management

Nguyen, Ho Lam; Tran, Dang Hoa

doi:10.30848/pjb2020-4(18)

Cited by 5 publications

(5 citation statements)

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“…It has been estimated that 53% area of coastal region is affected by serious salinity in both soil and water (Haque, 2006). Among the 19 coastal district almost all area is affected by moderate to severe salinity which has increased in last 5 years due to the hit of differernt cycone in very short distance (Kabir et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

Impact of Salinity: A Case Study in Saline Affected Satkhira District

Rezoyana,

Tusar,

Islam

2023

JSS

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Geographical location turns Bangladesh to the most disaster-prone country. People of the coastal areas of Bangladesh are fighting with different disaster like flood, cyclone, landslides, earthquake and thunderstorm. The aim of the study is to explore the impact of salinity on different sectors specially on livelihood and examine the changing patterns of livelihood and effectiveness of current adaptation measures in Satkhira district. The study found that salinity intrusion has severely affected traditional livelihood options. It has seen that 62.3% people of the study area has changed their livelihood as their previous and traditional livelihood options were affected by salinity which has led to the emergence of alternative livelihood options, such as shrimp farming, crab fattening, and day labor. However, even these alternatives are also facing challenges due to excess salinity and virus attacks. The study highlights the need for collaboration between NGOs and the government to ensure secure livelihoods for the community. The findings of this study have important implications for policymakers and practitioners working on disaster risk reduction and livelihood development in the coastal areas of Bangladesh.

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Section: Methodsmentioning

confidence: 99%

Impact of Salinity: A Case Study in Saline Affected Satkhira District

Rezoyana,

Tusar,

Islam

2023

JSS

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“…So far, researchers have paid more attention to the technical means of efficient output and less attention to the impacts in terms of saline and alkaline land improvement in the studies on fish pond farming in saline and alkaline land [16,17]. There is no study on dry salinity drainage between continuous cropland-wasteland-fish pond systems, and the soil water salinity of cropland-wasteland under the action of fish ponds has changed greatly, which has a positive effect on improving and preventing shallow soil salinization in the river-loop irrigation area.…”

Section: Introductionmentioning

confidence: 99%

Water–Salt Migration Patterns among Cropland–Wasteland–Fishponds in the River-Loop Irrigation Area

Yu,

Shi,

Miao

et al. 2024

Agronomy

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In order to investigate the influence of freshwater fish ponds on water and salt transport in cultivated wasteland in salinized areas, a typical study area was selected in the middle and lower reaches of the Hetao Irrigation District in China in the Yichang Irrigation Domain, and the temporal and spatial changes in the salinity of soil and salinity of groundwater and fish pond water in the cultivated–wasteland–fish pond system were characterized through the monitoring of the environmental information of soil and groundwater at the boundaries of the cultivated land, wasteland, and fish ponds. Salinity changes and groundwater migration in different periods were determined, and the response of soil salinity to the depth of groundwater burial was analyzed, as well as the effect of fish ponds on soil salinization. The results showed that the amount of groundwater migrating from cropland to wasteland during the simulation period in 2022 was 2700 m3, the amount of groundwater migrating from wasteland to fish ponds was 630 m3, and the amount of groundwater migrating from fish ponds to wasteland during the fall watering period was 440 m3. From an overall perspective, the average soil salinity of wasteland was 1.56 times higher than that of the boundary of fish ponds. Not only do fish ponds play a positive role in the ecosystem, but they also have a desalinization effect that reduces soil salinity significantly. Groundwater depth and soil salinity have an exponential relationship; when the depth of groundwater is greater than 1.75 m, the soil salinity varies little with the depth of groundwater and the soil salinity is less than 0.66 ds/m, which can be determined as the critical depth, and the average depth of groundwater in cultivated land in the study area is 1.5 m. Therefore, it is necessary to reasonably control the water level of fish ponds, so as to make the groundwater depth of cultivated land control between 1.75 m and 2.0 m, and to prevent soil salinization.

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“…Due to the mismatch between urban land and agricultural land, developing coastal land resources for crop cultivation has become a common choice for many countries and regions [1][2][3][4]. Unlike ordinary cultivated soils, coastal saline soils usually have characteristics such as high salt content, dense structure, and poor permeability and fertility that need to be improved before being utilized.…”

Section: Introductionmentioning

confidence: 99%

Effects of Subsurface Drainage Spacing and Organic Fertilizer Application on Alfalfa Yield, Quality, and Coastal Saline Soil

Zhang,

Wang,

Yang

et al. 2024

Water

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Subsurface drainage and organic fertilizer application are two important measures for improving saline–alkali soils, while the effects of different drainage spacings combined with organic fertilizer application amounts on alfalfa growth and coastal saline soil properties have seldom been evaluated. This study designed subsurface drainage pipes at four spacing distances, including 0 m (CK, without subsurface drainage), 6 m (S1), 12 m (S2), and 18 m (S3), and three organic fertilizer application amounts, including 3000 kg/ha (N1), 4500 kg/ha (N2), and 6000 kg/ha (N3), to observe the effects of different combinations of subsurface pipe spacings and organic fertilization amounts on alfalfa yield, quality, soil salinity, and nutrients. The results showed that the yield of alfalfa increased with higher fertilization amounts and smaller spacing between drainage pipes. The highest yield occurred in the S1N3 treatment, and the three batches reached 1268.5 kg/ha, 3168.0 kg/ha, and 2613.3 kg/ha, respectively, significantly (p < 0.05) higher than CK for all three batches. The increase in organic fertilizer amount resulted in an increase of 0.5–9.3% in the crude protein content, a decrease of 1.8–3.4% in the neutral detergent fiber content, and a decrease of 1.3–5.5% in the acid detergent fiber content for alfalfa plants. Under CK, the contents of quality indicators in alfalfa were the highest. For the drainage treatments, the quality indicator contents were overall at a higher level under S3. Subsurface drainage had a reduction effect on the salinity of all the 0–80 cm soils. For the surface soil, it was detected that smaller spacing was beneficial for reducing soil salt content, while higher fertilization amounts increased the salt content. S1 reduced the soil salt content by 36.3–46.1% compared to CK; however, N3 increased the salt content by 7.0–16.2% compared to the other two fertilization treatments. In addition, smaller spacing between the subsurface drainage pipes generally reduced the soil’s available nitrogen, and total nitrogen increased the C/N ratio but had no significant effect on the organic matter. It was concluded that the spacing between subsurface drainage pipes and the application amounts of organic fertilizer have remarkable impacts on alfalfa yield and quality, mainly by changing the soil salinity and nutrient status.

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Saline soils and crop production in coastal zones of Vietnam: features, strategies for amelioration and management

Cited by 5 publications

References 0 publications

Impact of Salinity: A Case Study in Saline Affected Satkhira District

Impact of Salinity: A Case Study in Saline Affected Satkhira District

Water–Salt Migration Patterns among Cropland–Wasteland–Fishponds in the River-Loop Irrigation Area

Effects of Subsurface Drainage Spacing and Organic Fertilizer Application on Alfalfa Yield, Quality, and Coastal Saline Soil

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