Water use efficiency of flooded rice fields I. Validation of the soil-water balance model SAWAH

Wopereis, M.C.S.; Bouman, B.A.M.; Kropff, M.J.; Berge, H.F.M. ten; Maligaya, A.R.

doi:10.1016/0378-3774(94)90014-0

Cited by 86 publications

(70 citation statements)

References 9 publications

(11 reference statements)

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“…The transport model, based on the perfect mixing principle, worked well for calculating N flows between soil layers. Simulated results for percolation and N leaching with the puddling effect are in agreement with reported data (Wopereis et al 1992(Wopereis et al , 1994 and illustrate the advantage of an impermeable or hardpan layer in increasing water and nutrient use efficiencies. Interpretation of the dynamic of N loss through volatilization and denitrification with calendars of fertilizer application showed that the gaseous N loss was high for high fertilization crops, high number of fertilizer application.…”

Section: Modeling Nitrogen Leaching Lossessupporting

confidence: 86%

Nitrogen Leaching in Intensive Cropping Systems in Tam Duong District, Red River Delta of Vietnam

Keulen

Roetter

2009

Water Air Soil Pollut

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The environmental and economic consequences of nitrogen (N) lost in rice-based systems in Vietnam is important but has not been extensively studied. The objective of this study was to quantify the amount of N lost in major cropping systems in the Red River Delta. An experiment was conducted in the Red River Delta of Vietnam, on five different crops including rose, daisy, cabbage, chili, and a rice-rice- with about 50 kg N ha −1 . We developed a simple N transport model that combined water and N movement through the soil profile. In most cases, the model accurately predicted the seasonal dynamics of N as well as N flow between soil layers and the amounts of N lost from the soil profile. The simulated results of N leaching with soil "puddling" conditions illustrate the advantage of an impermeable or hardpan layer in increasing water and nutrient use efficiencies in these soils. These model results also showed that it is possible to accurately estimate N losses with only a few parameters and helped us identify the risks of N leaching.

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Section: Modeling Nitrogen Leaching Lossessupporting

confidence: 86%

Nitrogen Leaching in Intensive Cropping Systems in Tam Duong District, Red River Delta of Vietnam

Keulen

Roetter

2009

Water Air Soil Pollut

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“…Ayob et al [43] reported daily average percolation value of 0.17 cm day −1 at KADA Paddy Irrigation Scheme, Malaysia. However, it is much lower than those observed by other authors in Southeast Asian regions [44,45]. This is mainly due to the changes in the conditions of rice fields including soil texture and structure, top and subsoil thickness, standing water depth, water and soil temperature and salinity, depth to the groundwater table, and other topographical conditions [40].…”

Section: Discussionmentioning

confidence: 76%

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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“…Because in Painuli et al (1988), individual plots were isolated by polyethylene sheets installed vertically to 0.5-mdepth, the increased water loss could be interpreted as due to under-bund percolation rather than to seepage. Similarly, much of the tenfold difference between seepage-pluspercolation and percolation in 30 by 15m plots reported by Wopereis et al (1994) might have been attributed to under-bund percolation.…”

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confidence: 89%

Mechanisms and Control of Percolation Losses in Irrigated Puddled Rice Fields

Tuong

Márquez

Kropff

et al. 1994

Soil Science Soc of Amer J

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The low water use efficiency of irrigated lowland rice is partly due to water loss by percolation. Mechanisms of percolation losses were studied in a puddled rice field with a permeable subsoil using simulation models and field experiments. Inclusion of small nonpuddled areas (1.5 m2 per 100 m2 of puddled soil) within the field with 5‐cm ponding water depth (PWD) increased field water loss from 2.7 mm d−1 to 15 mm d−1. Under‐bund percolation rate (lateral movement of ponded water into the bunds, then vertically down to the water table) was about 10 mm d−1 in a 25 by 100 m field. A one‐dimensional mechanistic soil‐water balance model, SAWAH, accurately simulated the measured water losses in a homogeneously puddled rice field only when lateral flow toward nonpuddled spots and bunds was prevented. Maintaining shallow PWD did not significantly affect percolation loss through uniformly puddled soil but greatly reduced losses in nonpuddled spots and under‐bund percolation. Sealing the bund walls with puddled soil material will decrease the horizontal conductivity of the bunds and may further reduce under‐bund percolation.

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Water use efficiency of flooded rice fields I. Validation of the soil-water balance model SAWAH

Cited by 86 publications

References 9 publications

Nitrogen Leaching in Intensive Cropping Systems in Tam Duong District, Red River Delta of Vietnam

Nitrogen Leaching in Intensive Cropping Systems in Tam Duong District, Red River Delta of Vietnam

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

Mechanisms and Control of Percolation Losses in Irrigated Puddled Rice Fields

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