Effect of nitrogen, potassium and humic acid on 134 Cs transfer factors to wheat from tropical soils in Neubauer growth units

The aims of this study were to investigate the vertical distributions of natural radionuclides 232 Th, 226 Ra and 40 K as well as anthropogenic radionuclide 137 Cs in soil samples and to analyze the correlation among the radioactivity of these radionuclides and the physiochemical characteristics of soil samples namely pH, grain size, carbonate content and organic matter. Risk assessment of the radiological hazard has also been estimated. Forty-four soil samples were collected from eleven locations in Qatar at four depth levels from 0 to 16 cm. The average concentrations of 232 Th, 226 Ra, 40 K and 137 Cs in the soil depth of 16 cm were 10, 17, 201 and 4 Bq/kg, respectively, which were within the reported world mean. The external absorbed gamma dose rate, the annual effective dose, the mean radium equivalent activity, the external hazard index and the lifetime cancer risk were 22 nGy/h, 0.027 mSv/y, 47 Bq/kg, 0.125 and 0.096 × 10 −3 , respectively. These values were far below the minimum recommended international values. The level of radioactivity concentrations in the soil was affected by the physiochemical characteristics of the soil. The positive correlation with highest R 2 value was found among the radioactivity concentrations of 232 Th and 40 K and the soil clay content. Total organic carbon was also positively correlated for 226 Ra and 137 Cs activity concentrations, whereas, carbonate content was negatively correlated with the radioactivity concentrations of 232 Th and 40 K. As far as soil moisture content is concerned, the positive correlation with highest R 2 value was obtained for 226 Ra activity concentrations.

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“…At low pH value, more 137 Cs is detected. Physical soil actions caused by runoff can also affect the final distribution of 137 Cs 14,15 .…”

Section: Introductionmentioning

confidence: 99%

Vertical distribution and radiological risk assessment of 137Cs and natural radionuclides in soil samples

Ahmad

Al-Ghouti

AlSadig

et al. 2019

Sci Rep

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“…As an important channel for nutrient and water uptake and transport of photosynthetic products to the roots, the leaf midrib proportion depends on the availability of nutrients and water supply and the photosynthetic rates of leaves (Que et al., 2022). HA improved nutrient uptake (Table 1; Gao et al., 2019; Sandeep et al., 2009), increased the daily leaf growth rate (Figure 4) and photosynthetic rate of tobacco leaves (Que et al., 2022), and reduced the leaf midrib proportion (Figure 8). These effects were indirectly verified by the decrease in the leaf midrib proportion as the N application rate increased (Pu et al., 2023).…”

Section: Discussionmentioning

confidence: 99%

Application of humic acid increases the economic value and yield of superior tobacco as well as improves the chemical and processing quality

Pu,

Li,

Dai

et al. 2023

Crop Science

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The overuse of nitrogen (N) fertilizer in the vegetable growing season leads to a high amount of soil residual N and a decrease of resistance to tobacco disease in the vegetable–tobacco continuous cultivation system, which will seriously threaten the sustainable development of tobacco production. Humic acid (HA) rich in bioactive substances and microelements may enhance leaf growth rate and improve the quality of tobacco. A two‐factor randomized block experiment was carried out over 2 years to evaluate the effects of additional applying HA (0 and 150 L ha−1) combined with three N rates (0, 60, and 90 kg N ha−1) on tobacco growth, economic value, chemical, and processing quality. Applying HA significantly increased the tobacco economic value by 5%–28%. The superior tobacco yields positively correlated with the economic value (R2 = 0.88), which was the key factor determining the increase of the economic value. The application of HA decreased the disease severity and increased the microelement uptake and the daily leaf growth rate in the prosperous growing stage which was positively correlated with the superior tobacco yield. Applying HA significantly improved the chemical quality and reduced the leaf midrib proportion. At the N rate of 60 kg N ha−1, HA showed the best effect of improving quality and increasing income. Our results demonstrated that the addition of HA can significantly improve the economic value and the chemical and processing quality of tobacco. The best effect can be achieved by adjusting the N rate appropriately according to the amount of soil residual N before transplanting tobacco seedlings.

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“…Therefore, removal of 137 Cs from contaminated soils is an urgent issue (Yasunari et al, 2011). However, few results are available on 137 Cs absorption by plants in tropical and subtropical ecosystems and its formation from the soil (Monira et al, 2005;Sandeep et al, 2009). Thus, understanding the dynamics of 133 Cs in soils is crucial for assessing the remediation of contaminated soils with 137 Cs (Murota et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Could 137Cs remediation be accomplished with stable cesium (CsCl) on tropical soils?

et al. 2019

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Stable cesium can be considered as the best element for desorption of soil radio-cesium. It is considered an element that slightly absorbed by plants, so that the application of high doses to the soil could increase the absorption of 137Cs, which is desired for the remediation of contaminated soils. There is shortage of knowledge on remediation of tropical and subtropical soils contaminated with 137Cs. The aim of this work was to evaluate the use of 133Cs for the remediation of Brazilian tropical and subtropical soils contaminated with 137Cs. In addition, we investigated the Cs uptake by bean plants (Phaseolus vulgaris L.) grown in Cs contaminated soil. The experiment was carried out in pots under greenhouse conditions. Seven soil types were used in the experiment (Oxisol, Udox, Psamment, Ochrept; Aquoll; Udox and Udult), which received the application of four doses of 133Cs (0, 5, 10 and 20 mg/pot in a completely randomized design arranged in a factorial scheme (7 soil types x 4 doses of 133Cs) with three replicates. An increase in transfer factor values of 137Cs was observed for both shoot growth and grains, as well as in percentage of total activity of 137Cs removed from the soil regarding to addition of stable cesium levels in all soils. The results showed that psamment soil presented higher specific activity of 137Cs in the soil and grains, as well as for the transfer coefficient from soil to shoot growth and grains. The application of stable cesium chloride to soil did not cause any effects on dry matter production of shoot growth and grains. The addition of 133Cs increased the transfer from soil 137Cs to the plant regardless of soil type, proving the efficiency of this practice for the remediation of soils contaminated with radioactive Cs. In addition, the plants of common bean were efficient for use in phytoremediation.

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Effect of nitrogen, potassium and humic acid on 134 Cs transfer factors to wheat from tropical soils in Neubauer growth units

Cited by 11 publications

References 44 publications

Vertical distribution and radiological risk assessment of 137Cs and natural radionuclides in soil samples

Vertical distribution and radiological risk assessment of 137Cs and natural radionuclides in soil samples

Application of humic acid increases the economic value and yield of superior tobacco as well as improves the chemical and processing quality

Could 137Cs remediation be accomplished with stable cesium (CsCl) on tropical soils?

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