Measurement and modeling of soil water regime in a lowland paddy field showing preferential transport

Garg, Kaushal K.; Das, Bhabani S.; Safeeq, Mohammad; Bhadoria, P. B. S.

doi:10.1016/j.agwat.2009.06.018

Cited by 58 publications

(95 citation statements)

References 34 publications

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“…Differences in soil hydraulic properties (e.g., retention or hydraulic conductivity) between different soil layers cause characteristic water content profiles. While the plough sole layer was often saturated, unsaturated conditions occurred in the subsoil below the plough sole layer (Chen and Liu, 2002;Garg et al, 2009). This is because the subsoil is often more permeable than the plough sole layer and its hydraulic conductivity is 1.5-2.3 (or more) times higher than that of the plough sole layer.…”

Section: Soil Water Movement and Changes In Soil Storagementioning

confidence: 98%

“…The difference between simulated and observed surface runoff can be attributed to several small surface runoff events simulated by Hydrus-1D that were not observed in the field. This could also be due to preferential flow caused by macropores and cracks, which was not considered in the simulation, and which would increase water infiltration and reduce surface drainage to a certain extent (Tsubo et al, 2007;Garg et al, 2009;Patil et al, 2011). Phogat et al (2010) showed that the Hydrus-1D model can describe root water uptake of transplanted rice very well.…”

Section: Flooding Water Depths and Surface Runoffmentioning

confidence: 99%

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Evaluation of water movement and water losses in a direct-seeded-rice field experiment using Hydrus-1D

Šimůnek

Jing

et al. 2014

Agricultural Water Management

100

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a b s t r a c tIn the recent decade, increasing costs of labor, water, and fertilizers around the world led to a change in the method of crop establishment from traditional transplanted rice (TPR) to direct-seeded rice (DSR) and to a substantial rise in the DSR-managed area. Since water management in areas with DSR is quite different from those with TPR, vertical water movement and water and nutrient losses during the crop season may be different as well. Water flow and water losses in a DSR field in the Taihu Lake Basin of east China were monitored and evaluated using Hydrus-1D during two seasons with different rainfalls and irrigation managements.

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Section: Soil Water Movement and Changes In Soil Storagementioning

confidence: 98%

Section: Flooding Water Depths and Surface Runoffmentioning

confidence: 99%

Evaluation of water movement and water losses in a direct-seeded-rice field experiment using Hydrus-1D

Šimůnek

Jing

et al. 2014

Agricultural Water Management

100

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show abstract

“…There was generally very good agreement between the simulated and measured soil water contents, though there are some discrepancies. It is not possible to specifically identify the causes of the discrepancies, but they might be partially attributable to preferential flow caused by macropores and cracks [44,45], spatial heterogeneity and observation errors [46], and the locally occurring chemical processes, such as adsorption-desorption, and proportional root uptake [22], and precipitation/dissolution reactions in soils [47].…”

Section: Model Calibration and Validationmentioning

confidence: 99%

Modeling of Soil Water and Salt Dynamics and Its Effects on Root Water Uptake in Heihe Arid Wetland, Gansu, China

Jian-guo

et al. 2015

Water

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Abstract:In the Heihe River basin, China, increased salinity and water shortages present serious threats to the sustainability of arid wetlands. It is critical to understand the interactions between soil water and salts (from saline shallow groundwater and the river) and their effects on plant growth under the influence of shallow groundwater and irrigation. In this study, the Hydrus-1D model was used in an arid wetland of the Middle Heihe River to investigate the effects of the dynamics of soil water, soil salinization, and depth to water table (DWT) as well as groundwater salinity on Chinese tamarisk root water uptake. The modeled soil water and electrical conductivity of soil solution (ECsw) are for ECsw, during the model calibration and validation periods, respectively). The calibrated model was used in scenario analyses considering different DWTs, salinity levels and the introduction of preseason irrigation. The results showed that (I) Chinese tamarisk root distribution was greatly affected by soil water and salt distribution in the soil profile, with about 73.8% of the roots being distributed in the 20-60 cm layer; (II) root water uptake accounted for 91.0% of the potential maximal value when water stress was considered, and for 41.6% when both water and salt stress were considered; (III) root water uptake was very sensitive to fluctuations of the water table, and was greatly reduced when the DWT was either dropped or raised 60% of the 2012 reference depth; (IV) arid wetland vegetation exhibited a high level of groundwater dependence even though shallow groundwater resulted in increased soil salinization and (V) preseason irrigation could effectively increase root water uptake by leaching salts from the root zone. We concluded that a suitable water table and groundwater salinity coupled with proper irrigation are key factors to sustainable development of arid wetlands.

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“…An operation of puddling, which means mixing soil and impounded water before transplanting, is conducted for this purpose [42][43][44]. In puddling operation, farmers break soil aggregations and fill crack in plow sole with small soil particles, and this leads to low conductivity of plow sole.…”

Section: Adding Puddling Operation To Scheduled Managementmentioning

confidence: 99%

Development of SWAT-PADDY for Simulating Lowland Paddy Fields

Tsuchiya

Kato

Jeong

et al. 2016

Preprint

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The consumption of rice, which recently increases globally, leads to requirement for planning sustainable water management for paddy cultivation. In this research, SWAT model was modified to evaluate sustainability of paddy cultivation. Modifications to simulate paddy cultivation are 1) to equip with a new water balance model of impounded fields, 2) to add an irrigation management option for paddy fields, which is characterized by flood irrigation managed by farmers on a daily basis, 3) to consider puddling operation that influences water quality and infiltration rate of soil. The enhanced model, named SWAT-PADDY, was applied to an agricultural watershed in Japan as a case study. The modified model succeeded in representing paddy cultivation in the study area. However, SWAT-PADDY underestimated base flow in irrigation period. The cause of this is inferred that the modified model doesn't represent return flow of excess withdrawal of river water. In conclusion, addition of the models of impoundment and management practices in paddy fields to SWAT improved field scale simulation of water balance and irrigation in paddy fields. However, further improvement of the model on irrigation return flow process is needed to better predict hydrology of watersheds dominated by paddy irrigation.

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Measurement and modeling of soil water regime in a lowland paddy field showing preferential transport

Cited by 58 publications

References 34 publications

Evaluation of water movement and water losses in a direct-seeded-rice field experiment using Hydrus-1D

Evaluation of water movement and water losses in a direct-seeded-rice field experiment using Hydrus-1D

Modeling of Soil Water and Salt Dynamics and Its Effects on Root Water Uptake in Heihe Arid Wetland, Gansu, China

Development of SWAT-PADDY for Simulating Lowland Paddy Fields

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