Transport Characteristics of Nitrite in a Shallow Sedimentary Aquifer in Northwest China as Determined by a 12-Day Soil Column Experiment

Dou, Ying; Howard, Ken; Qian, Hui

doi:10.1007/s12403-016-0206-x

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…The study of nitrogen transformation processes in the soil-fertilizer-plant system is an issue of interest to scientists throughout the world community. Scientists from the People's Republic of China are conducting research on nitrogen uptake in rice paddies and increasing the gross nitrogen transformation ratio [11][12]. In the United States, the teachings use the isotope indication method to study its uptake and assess the retention of N15 in biota tissues [13].…”

Section: Resultsmentioning

confidence: 99%

Cultivation of leguminous crops of chickpeas and ways to increase the yield and quality of grain in the arid steppe of the Urals

Japarov

Nurgaliyeva

Gumarova

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The article discusses the data of field experiments on the cultivation of chickpea with the use of mineral fertilizers and biological products. Chickpea, for the dry steppe of the Ural region of Kazakhstan, is a good drought-resistant crop to ensure stable grain yields with a high protein content. Experiments in 2012-2014 showed that the yield of the crop was in the range from 0.78 t / ha in the control variant to 1.16 t / ha, where the strain H-27 was applied according to the background of the applied fertilizers N20P20. From the use of only one strains of the genus Rhizobium, the increase in yield, on average for the options, amounted to 0.17 t / ha (21.7%), according to the background of mineral fertilizers from 0.22 to 0.38 t / ha. In 2015-2017 the yield from the use of mineral fertilizers and microbial preparations increased by 0.74-1.12 t / ha, or by 22-51%. The increase from nitrogen fertilization is 8-12%, from microbial preparations - 6-12%. With the combined use of nitrogen fertilizer and Rhizoagrin or Flavobacterin preparations, the yield increased by almost 50%, as well as with the combined use of microbial preparations. An increase in the protein content of grain is associated with the use of nitrogen fertilization and the use of biological products for inoculating seeds, since these factors improve the nitrogen nutrition of plants.

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Section: Resultsmentioning

confidence: 99%

Cultivation of leguminous crops of chickpeas and ways to increase the yield and quality of grain in the arid steppe of the Urals

Japarov

Nurgaliyeva

Gumarova

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Different from previous studies, Jiang et al (2016) used isotopic signatures to determine that nitrate in groundwater may also be derived from atmospheric precipitation. Further, soil column experiments show that nitrite transport in shallow sedimentary aquifers of northwest China is influenced by factors such as flow velocity, temperature, and pH (Dou et al 2016a). In addition to nitrogen pollution, organic pollution is emerging rapidly in western China (e.g., Li et al 2016b;Zeng et al 2016).…”

Section: Final Remarksmentioning

confidence: 99%

Groundwater Quality in Western China: Challenges and Paths Forward for Groundwater Quality Research in Western China

2016

Expo Health

140

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Groundwater quality issues are becoming as important as groundwater quantity issues, making groundwater quality research a hot topic worldwide. With human activity intensifying in western China as a result of the West Development Program and the Silk Road economic belt project of China, groundwater quality in western China is deteriorating rapidly. This special issue of Exposure and Health promotes groundwater quality research to respond to these challenges. This introductory article details the challenges faced by contemporary groundwater quality researchers, and proposes ways to advance groundwater quality research in western China. The paper also introduces the articles that follow in this special issue. The key goal of this work is to encourage new and experienced scholars to engage with this field.

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“…However, most of the batch test results reported in the literature show that the isothermal adsorption curves of heavy-metal ions are mostly nonlinear [1,[23][24][25][26]. Dou et al [27] simulated the breakthrough curve with a retardation factor that gradually decreased over time, i.e., considering nonlinear adsorption as linear adsorption. Xie et al [28] presented analytical solutions considering a piecewise linear adsorption.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Factors for Compacted Clay Liner Performance Considering Isothermal Adsorption

2021

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The concentration profiles and breakthrough curves of the 2 m thick compacted clay liner (CCL) given in the specification were compared, considering three different adsorption isotherms (upper convex, linear, and lower concave). In addition, the effects of transport parameters, sorption isotherms, and source concentrations on pollutant migration were analyzed. The results showed that the dimensionless breakthrough curves of different source concentrations considering the linear adsorption isotherm coincided with each other, as the partition coefficient of the linear adsorption isotherm was constant. For the lower concave isotherm, the migration of a large source concentration was slowest, because the partition coefficient of the lower concave isotherm increased with an increase in concentration. For the upper convex isotherm, the migration of a large source concentration was fastest, because the partition coefficient decreased with an increase in concentration. The effects of the nonlinear isotherms on the shape of the outflow curve were similar to the effects of a change in the hydrodynamic dispersion (Dh): the concentration front of the upper convex isotherm was narrower, which was similar to the effect of a reduction in Dh (i.e., PL), and the concentration front of the lower concave isotherm was wider and similar to the effect of an increase Dh (i.e., PL). Therefore, the diffusion and adsorption parameters were fitted separately in the study, in case the nonlinear adsorption behavior was mistakenly defined as linear adsorption.

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Transport Characteristics of Nitrite in a Shallow Sedimentary Aquifer in Northwest China as Determined by a 12-Day Soil Column Experiment

Cited by 7 publications

References 26 publications

Cultivation of leguminous crops of chickpeas and ways to increase the yield and quality of grain in the arid steppe of the Urals

Cultivation of leguminous crops of chickpeas and ways to increase the yield and quality of grain in the arid steppe of the Urals

Groundwater Quality in Western China: Challenges and Paths Forward for Groundwater Quality Research in Western China

Analysis of Factors for Compacted Clay Liner Performance Considering Isothermal Adsorption

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