Dissolved nitrogen model for paddy field ponded water during irrigation period

Yoshinaga, Ikuo; Yu, Feng; Singh, Ram Karan; Shiratani, Eisaku

doi:10.1007/s10333-004-0053-4

Cited by 12 publications

(2 citation statements)

References 12 publications

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“…The objective of this paper, therefore, is to provide an overview of modelling concepts and performance of 14 models developed to simulate N dynamics in flooded soil systems. The 14 models are NFLOOD v.1, NFLOOD v.2, J‐M's, S‐K's, CERES‐Rice, Chowdary's, Nakasone's, Yoshinaga's, DNDC‐Rice, K–K's, Liang's, RIWER, RICEWNB and APSIM‐Oryza . With substantial progress in modelling of N dynamics in flooded soil systems since previously published multi‐model reviews, this overview provides breadth of knowledge on available models for simulating N dynamics in flooded soil systems, and, therefore, is valuable as a first step in the selection of an appropriate model for a specific application.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen dynamics in flooded soil systems: an overview on concepts and performance of models

et al. 2017

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Extensive modelling studies on nitrogen (N) dynamics in flooded soil systems have been published. Consequently, many N dynamics models are available for users to select from. With the current research trend, inclined towards multidisciplinary research, and with substantial progress in understanding of N dynamics in flooded soil systems, the objective of this paper is to provide an overview of the modelling concepts and performance of 14 models developed to simulate N dynamics in flooded soil systems. This overview provides breadth of knowledge on the models, and, therefore, is valuable as a first step in the selection of an appropriate model for a specific application. © 2017 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Section: Introductionmentioning

confidence: 99%

Nitrogen dynamics in flooded soil systems: an overview on concepts and performance of models

et al. 2017

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“…Denitrification removes NO 3 -from the soil system as N 2 gas (Choudhury & Kennedy, 2005). However, N-transformation processes are complicated and dependent on the characteristics of soils (Nakasone et al, 2004;Yoshinaga et al, 2004;Evans et al, 2006).…”

Section: Groundwater Contamination Due To Excess Urea Applicationsmentioning

confidence: 99%

Fate of urea fertilizers in sandy aquifers: laboratory and field case study from Kalpitiya, Sri Lanka

Jayasingha¹,

Pitawala²,

Dharmagunawardhana³

2013

J. Natn. Sci. Foundation Sri Lanka

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Abstract:High nitrate (NO 3 -) levels in groundwater are attributed to fertilizer leaching from sandy soil. A simulation laboratory study was performed to investigate the fate of leached urea in an agricultural field in Kalpitiya and the enhancement of fertilizer retention in sandy soil. A field experiment was conducted to investigate the effectiveness of using nutrient rich groundwater to reduce the nitrate levels in the Kalpitiya aquifer. Nitrate retention experiment revealed that increasing clay up to 15 % increased the retention by > 50 % with an efficiency of 3.7 % and the retention is conversely correlated with the quantity of clay. A soil column experiment showed that nitrate concentration of leachate increases rapidly for an initial period of 250 hours and then started to decrease gradually. Initial nitrification followed by denitrification reactions may be the causative factors for this behaviour. The study further revealed that clay and organic manure are potential sinks of nitrate while the latter is also a source of nitrate. Gradual building up of nitrate in the groundwater of the aquifer system appears to be due to available favourable conditions for continuous nitrification while cycling through the aquifer due to intensive irrigation. This field case study reveals that a polluted aquifer can probably be recovered by reusing the nitrate contaminated groundwater as a source of fertilizer for the crops cultivated on the land above the aquifer allowing longer contact time for plant uptake. The process can gradually purify the groundwater while allowing farmers to use less nitrate fertilizers.

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Modelling analysis of nitrogen removal from paddy water with high infiltration rate

Saiki,

Egusa,

Ohte

et al. 2024

Irrig Sci

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An understanding of nitrogen processes in a paddy field, characterised by large water flux for irrigation and outflows under continuous irrigation, is required to manage adequate nitrogen inputs and outputs. This study identifies the effect of large water flux, especially high infiltration rate, on nitrogen processes in a paddy field under continuous irrigation. The developed nitrogen process model in this study was applied to two paddy fields having different infiltration rates (216 and 106 mm day− 1 on average), and simulated physicochemical and biological nitrogen processes in ponded water, soil water and soil, including whole water flows as well as organic, and inorganic nitrogen forms. In each field, irrigation was found to be the major nitrogen input (153.2–461.5 kg N ha− 1 year− 1), and nitrogen outflow (65.2–284.3 kg N ha− 1 year− 1) found to be smaller than the input from irrigation. The irrigation water was primarily contaminated by dissolved organic nitrogen (DON) and nitrate. Nitrogen transportation from ponded water to soil water was four times greater under high infiltration condition than under low infiltration condition. High nitrogen transport to the soil layer increased air emission via denitrification and decreased outflows. In particular, DON and ammonium transported to soil water are sources of nitrite and nitrate, and denitrification was five times higher under high infiltration than low infiltration. The results of this study imply that paddy fields with high infiltration rates have a greater possibility of nitrogen removal from paddy water, rather than being a pollutant source for the water environment.

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Dissolved nitrogen model for paddy field ponded water during irrigation period

Cited by 12 publications

References 12 publications

Nitrogen dynamics in flooded soil systems: an overview on concepts and performance of models

Nitrogen dynamics in flooded soil systems: an overview on concepts and performance of models

Fate of urea fertilizers in sandy aquifers: laboratory and field case study from Kalpitiya, Sri Lanka

Modelling analysis of nitrogen removal from paddy water with high infiltration rate

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