Field analysis of water and nitrogen fate in lowland paddy fields under different water managements using HYDRUS-1D

Tan, Xuezhi; Shao, Dongguo; Gu, W; Liu, Huan-Huan

doi:10.1016/j.agwat.2014.12.005

Cited by 102 publications

(65 citation statements)

References 63 publications

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“…Therefore, soil salinity has been shown to reduce the µ w1 value under irrigation. Compared with µ w1 , the µ w2 value in our study ranged from 0.04 to 0.12 day -1 among the different soil salinity levels, and this result was similar to that of the studies by Li et al [31] and Tan et al [32]. Therefore, under irrigation, the effects of soil salinity on µ w2 could not be directly compared to the effects of irrigation water levels.…”

Section: Discussionsupporting

confidence: 71%

“…1 ranged from 0.0024 to 0.1992 day -1 , which was reduced from 99.63% to 73.08% compared with that of the studies of Li et al [31] and Tan et al [32], respectively. The µ w1 value in Tan et al [32] ranged from 0.65 to 0.7 day -1 and the value in Li et al [31] was even larger at 0.74 day -1 , and these phenomena may have been caused by soil salinity because the study sites of Li et al [31] and Tan et al [32] are usually regarded as non-saline soils. Therefore, soil salinity has been shown to reduce the µ w1 value under irrigation.…”

Section: Discussionmentioning

confidence: 74%

“…Li et al [31] applied the HYDRUS-1D model to evaluate the nitrogen balance in an experimental direct-seeded rice field in the Taihu Lake Basin of east China. Tan et al [32] also used the HYDRUS-1D model to analyse the water and nitrogen dynamics of lowland paddy fields under alternating wet and dry irrigation in the Tuanlin experimental paddy fields of Hubei, China. In our study, the µ w1 value in Exp.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Nitrogen Transportation and Transformation Under Different Soil Water and Salinity Conditions

Zeng

Huang

et al. 2016

Ecological Chemistry and Engineering S

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Soil nitrogen transportation and transformation are important processes for crop growth and environmental protection, and they are influenced by various environmental factors and human interventions. This study aims to determine the effects of irrigation and soil salinity levels on nitrogen transportation and transformation using two types of experiments: column and incubation. The HYDRUS-1D model and an empirical model were used to simulate the nitrogen transportation and transformation processes. HYDRUS-1D performed well in the simulation of nitrogen transportation and transformation under irrigated conditions (R 2 as high as 0.944 and 0.763 for ammonium and nitrate-nitrogen simulations, respectively). In addition, the empirical model was able to attain accurate estimations for ammonium (R 2 = 0.512-0.977) and nitrate-nitrogen (R 2 = 0.410-0.679) without irrigation. The modelling results indicated that saline soil reduced the rate of urea hydrolysis to ammonium, promoted the longitudinal dispersity of nitrogen and enhanced the adsorption of ammonium-nitrogen. Furthermore, the effects of soil salinity on the nitrification rate were not obviously comparable to the effects of the amount of irrigation water. Without irrigation, the hydrolysis rate of urea to ammonium decreased exponentially with the soil salinity (R 2 = 0.787), although the nitrification coefficient varied with salinity. However, the denitrification coefficient increased linearly with salinity (R 2 = 0.499).

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Section: Discussionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

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Nitrogen Transportation and Transformation Under Different Soil Water and Salinity Conditions

Zeng

Huang

et al. 2016

Ecological Chemistry and Engineering S

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“…In the present study, the optimized parameter values by Singh et al [30] for rice crops (h 1 = 100 cm, h 2 = 55 cm, h 3 (high) = −160 cm, h 3 (low) = −250 cm, and h 4 = −15,000 cm were used to parameterize the water stress response proposed [29]. These parameters were also used by [2,19,20]. The parameters h 1 , h 2 , h 3 , and h 4 represent different pressure heads.…”

Section: Calculation Of Reference Evapotranspirationmentioning

confidence: 99%

“…As the water movement in a rice field is vertical due to constant ponding water condition, the one-dimensional model can be used effectively [12]. Furthermore, since the seepage in paddy plots is minimized, and water and solute transport can be simplified to a vertical movement [19], thus, the Hydrus-1D model can be used in the present study, even though it has been often used by many researchers to simulate water flow and solute transport in flooded rice fields [18,20]. Indeed, no study is reported yet on this important aspect in Malaysia.…”

Section: Introductionmentioning

confidence: 99%

An Assessment of the Vertical Movement of Water in a Flooded Paddy Rice Field Experiment Using Hydrus-1D

Mo'allim

Kamal

Muhammed

et al. 2018

Water

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A quantitative estimation of the major components of the field water balance provides management decisions on how the scheme ought to be operated to ensure better distribution of irrigation water and increased delivery performance. Therefore, in this study, the water balance component in transplanted and broadcasted rice fields with conventional irrigation (flooding irrigation) in the Tanjung Karang Rice Irrigation Scheme (TAKRIS), Sawah Sempadan were observed and then modeled using Hydrus-1D numerical model during two consecutive rice growing seasons. During the off-season, irrigation water accounted for 59.6% of the total water input (irrigation + rainfall), but about 76.2% of total water input during the main season. During the main season, rainfall water only contributed to 23.8% of total water input and 40.4% during the off-season. Drainage water accounted for 37.3% of the total water input during the off-season and 43.7% during the main season, respectively, which was the main path of water losses from conventional rice fields, which indicates that maintaining a high water level and huge rainfall events during both seasons increased drainage water. Simulated ET during the off-season and the main season accounted for 38.1% and 49.5% of the total water input, respectively. Observed and simulated water percolation revealed about 17.1% to 19.2% of total water input during both seasons, respectively. Additionally, the water productivities analyzed from total water input and irrigation water were 0.43 and 0.72 kg m −3 during the off-season and 0.60 and 0.78 kg m −3 during the main season, respectively. The water productivity index evaluated from observed and modeled evapotranspiration was 1.03 and 1.13 kg m −3 during the off-season and 0.98 and 0.94 kg m −3 during the main season, respectively. The overall results revealed that Hydrus-1D simulations were a reasonable and effective tool for simulating vertical water flow in both broadcasted and transplanted rice experimental fields.

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Biomass and elemental concentrations of 22 rice cultivars grown under alternate wetting and drying conditions at three field sites in Bangladesh

Norton

Travis

Danku

et al. 2017

Food and Energy Security

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As the global population grows, demand on food production will also rise. For rice, one limiting factor effecting production could be availability of fresh water, hence adoption of techniques that decrease water usage while maintaining or increasing crop yield are needed. Alternative wetting and drying (AWD) is one of these techniques. AWD is a method by which the level of water within a rice field cycles between being flooded and nonflooded during the growth period of the rice crop. The degree to which AWD affects cultivars differently has not been adequately addressed to date. In this study, 22 rice cultivars, mostly landraces of the aus subpopulation, plus some popular improved indica cultivars from Bangladesh, were tested for their response to AWD across three different field sites in Bangladesh. Grain and shoot elemental concentrations were determined at harvest. Overall, AWD slightly increased grain mass and harvest index compared to plants grown under continually flooded (CF) conditions. Plants grown under AWD had decreased concentrations of nitrogen in their straw compared to plants grown under CF. The concentration of elements in the grain were also affected when plants were grown under AWD compared to CF: Nickel, copper, cadmium and iron increased, but sodium, potassium, calcium, cobalt, phosphorus, molybdenum and arsenic decreased in the grains of plants grown under AWD. However, there was some variation in these patterns across different sites. Analysis of variance revealed no significant cultivar × treatment interaction, or site × cultivar × treatment interaction, for any of the plant mass traits. Of the elements analyzed, only grain cadmium concentrations were significantly affected by treatment × cultivar interactions. These data suggest that there is no genetic adaptation amongst the cultivars screened for response to AWD, except for grain cadmium concentration and imply that breeding specifically for AWD is not needed.

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Field analysis of water and nitrogen fate in lowland paddy fields under different water managements using HYDRUS-1D

Cited by 102 publications

References 63 publications

Nitrogen Transportation and Transformation Under Different Soil Water and Salinity Conditions

Nitrogen Transportation and Transformation Under Different Soil Water and Salinity Conditions

An Assessment of the Vertical Movement of Water in a Flooded Paddy Rice Field Experiment Using Hydrus-1D

Biomass and elemental concentrations of 22 rice cultivars grown under alternate wetting and drying conditions at three field sites in Bangladesh

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