Climatic control of major and trace elements in paddy soils from wet and dry regions of Sri Lanka

Rubasinghe, Ruvini Takshala; Gunatilake, S. K.; Chandrajith, Rohana

doi:10.1016/j.envc.2021.100361

Cited by 12 publications

(5 citation statements)

References 44 publications

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“…In Sri Lanka, paddy soils face challenges of overexploitation, with nutrient depletion emerging as a prevalent issue across the entire island. The extensive use of agrochemicals has led to soil pollution, particularly with toxic trace elements, contributing to a decline in soil fertility over recent decades (Rubasinghe et al, 2021). Paddy soils, especially those integrated with fish cultivation, serve as favored habitats for numerous soil microorganisms.…”

Section: Effects Of Rice-fish Integration On Soil Fertility Of Rice F...mentioning

confidence: 99%

Exploring Ecological Functions of Rice-Fish Integration in the Agricultural Landscape: A Review to Investigate Feasibility of Implementing Rice-Fish Integration in Sri Lanka

Kumara,

Atapaththu,

Herath

et al. 2024

J. Agro-Technol. Rural Sci.

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Rice-fish integration is, a symbiotic farming system where fish are reared in rice fields. Although this farming method widespread in many Asian countries, it is relatively new to Sri Lanka, and consequently information on its ecological functions under Sri Lankan context is scarce. Therefore, detailed investigation on the ecological function of rice fish integration would provide necessary information to establish rice-fish integration in Sri Lanka. This study followed a qualitative case study approach, including literature review and extensive document analysis. The results highlighted the rice-fish integration approach presents an array of ecological functions, underscoring its potential as a sustainable agricultural practice. Ecologically, the presence of fish in the system contributes to increase nutrient availability for rice plants, and biologically control weed and pest. Further, rice-fish integration promotes soil fertility of rice fields which improves growth and nutrient uptake of rice plants. The rice plants, in turn, play a pivotal role to maintain biodiversity in rice fields through water purification, establishing optimal water temperature conditions, and providing an array of micro habitats for a diverse aquatic fauna and flora. On the other hand, rice fish integration promotes water use efficiency, higher economic return and animal protein requirement of local farming communities. Considering ecological, economical and health benefits, integration of tilapia fish with suitable rice varieties available in Sri Lanka is proposed. In conclusion, the rice-fish integration is an ecologically balanced farming system which has a potential to enhance the sustainability of rice field farming systems in Sri Lanka.

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Section: Effects Of Rice-fish Integration On Soil Fertility Of Rice F...mentioning

confidence: 99%

Exploring Ecological Functions of Rice-Fish Integration in the Agricultural Landscape: A Review to Investigate Feasibility of Implementing Rice-Fish Integration in Sri Lanka

Kumara,

Atapaththu,

Herath

et al. 2024

J. Agro-Technol. Rural Sci.

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“…1). Several studies have reported that rice cultivated soils are highly modified through anthropogenic activities, creating temporal and spatial variation in chemical properties (Chandrajith et al, 2005;Rosemary et al, 2017;Rubasinghe et al, 2021). Moreover, topography even within a narrow spatial scale, can also contribute to the variation in soil pH and EC (Liu et al, 2009;Vitharana et al, 2008;Rosemary et al, 2017).…”

Section: Soil Ph and Ec In Rice Soilsmentioning

confidence: 99%

“…The key anthropogenic activities include land preparation, fertilizer applications, and irrigation methods adopted (Chandrajith et al, 2005b;Fageria et al, 2011;Rathnayake et al, 2017b;Rosemary et al, 2017;Balasooriya et al, 2021;Rubasinghe et al, 2021).…”

Section: Variation Of Soil Ph As Affected By Cropping Systems Soil Or...mentioning

confidence: 99%

Variability of pH and EC of Selected Rice Cultivated Soils of Sri Lanka

Delgoda,

Sugathas,

Neththasinghe

et al. 2023

Trop. Agric. Res.

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Soil pH and electrical conductivity (EC) are two major chemical properties affecting nutrient availability and rice grain yield. Therefore, this study was conducted to investigate the variation of pH and EC in the topsoil layer (0-15 cm) of rice fields as affected by major water source used for rice cultivation, rice-based cropping system adopted and rice growing soil orders in different agro-climatic zones (ACZs) in Sri Lanka. A total of 998 soil samples were collected from lowland rice fields. Both pH and EC were measured in 1:5 soil: water extracts. The pH of soil samples was in the range of 3.0-7.7 with a mean value of 5.0. Moreover, 75% of the soil samples had pH values below the optimum range for rice cultivation (5.5-7.0). Values of pH observed in Dry Zone soils were higher (5.2) than those in Wet Zone (4.4). Soil EC values ranged between 1.0 - 3,100 μScm−1 with a mean value of 148.5 μScm−1. Soil EC was similar among climatic zones (P>0.05). Upcountry Intermediate zone recorded the highest soil EC than that in other ACZs (P<0.05). Moreover, 73%, 22%, 3%, 2% and 0.1% of soil samples recorded EC values in the ranges of less than 150 (non-saline), 150-400 (slightly saline), 400-800 (moderately saline), 800-2000 (highly saline) and more than 2000 (very highly saline) μScm−1, respectively. Considering micro (e.g. paddy track) and macro (e.g. ACZ) scale spatial heterogeneity in soil pH and EC, appropriate site-specific strategies need to be adopted to improve soil pH and EC to suit sustainable rice crop production.

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“…2.7 Mt, and the per capita consumption uctuates around 100 kg year − 1 [10]. Therefore, reducing the accumulation of THM in rice grains via reduced contamination of agricultural soils and reduced transmission into the plant is crucial to food safety [5,6,11,12].…”

Section: Introductionmentioning

confidence: 99%

Biofilm biofertilizer manipulates toxic heavy metals and micronutrients in the soil-plant systems in Sri Lanka to produce high-quality rice: a sign of ecosystem intelligence

Warnakulasooriya,

Premarathna,

Ekanayake

et al. 2024

Preprint

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High toxic heavy metals (THM) and low micronutrient contents in rice grains affect adversely on human health. Here we investigated the potential of using biofilm biofertilizer (BFBF) in managing THM and micronutrients in rice by conducting field experiments that compared BFBF practice with the chemical fertilizer (CF) alone practice in Sri Lanka. Bioaccumulation and translocation factors were evaluated to assess the THM and micronutrient distribution in soil-plant systems. The human health risk was also estimated. The BFBF practice showed a significant reduction in estimated daily intakes of the THM like As, Co, Cd, and Cr compared to the CF practice, thus decreasing hazard quotient (HQ) and hazard index (HI) values for lowering health risk. In the CF practice, the translocation of As from panicle to rice seed was significantly increased, and As in rice seeds is reported to exceed the safe level in some cases in Sri Lanka. On the contrary, reduced translocation of As, and increased translocation of Cr within the safe level to rice seeds with the BFBF application were observed, implying a sign of intelligence in the paddy ecosystem. Interestingly, the HI had been kept below the threshold value by significantly reducing the HQ values of each THM, only in the BFBF practice. These results highlight the role of increased microbial diversity and abundance induced by the BFBF, in mitigating the health risks and enhancing the sustainability of the soil-plant system, a clear sign of ecosystem intelligence.

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Climatic control of major and trace elements in paddy soils from wet and dry regions of Sri Lanka

Cited by 12 publications

References 44 publications

Exploring Ecological Functions of Rice-Fish Integration in the Agricultural Landscape: A Review to Investigate Feasibility of Implementing Rice-Fish Integration in Sri Lanka

Exploring Ecological Functions of Rice-Fish Integration in the Agricultural Landscape: A Review to Investigate Feasibility of Implementing Rice-Fish Integration in Sri Lanka

Variability of pH and EC of Selected Rice Cultivated Soils of Sri Lanka

Biofilm biofertilizer manipulates toxic heavy metals and micronutrients in the soil-plant systems in Sri Lanka to produce high-quality rice: a sign of ecosystem intelligence

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