Modeling water balance components in relation to field layout in lowland paddy fields. II: Model application

Odhiambo, Lameck O.; Murty, V.V.N.

doi:10.1016/0378-3774(95)01215-x

Cited by 16 publications

(6 citation statements)

References 3 publications

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“…Interaction effect of N2 and submerged water management required higher water use due to higher evapotranspiration rate as a result of its higher leaf area index and evaporation [28]. With regards to water productivity, N2 treated plants under moist water condition gave higher water productivity compared to the rest of the treatment combinations due to its lower water use.…”

Section: Effect Of Water Management On Water Use Percentage Of Watermentioning

confidence: 99%

“…Saved and Water Productivity Submerged water management received higher amount of water use than AWD and moist treatments due to the standing water layer maintained continuously on the plot from crop establishment till ten days to harvest. According to [28] evapotranspiration was intense under continuous submergence. This probably increased the rate of evapotranspiration and percolation in submerged treatments which in turned increased water use.…”

Section: Effect Of Water Management On Water Use Percentage Of Watermentioning

confidence: 99%

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Agronomic, Water Productivity and Economic Analysis of Irrigated Rice under Different Nitrogen and Water Management Methods

Yakubu¹,

Ofori²,

Amoatey³

et al. 2019

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The most limiting factors for irrigated rice farming are water and nitrogen. Efficient water and nitrogen management has remained critical for sustainable rice production in irrigated rice farming system. Due to rapid global population growth and climate change, future rice production will depend heavily on developing strategies and practices that use water and nitrogen efficiently. The study therefore set to evaluate agronomic, water productivity and economic analysis of irrigated rice under various nitrogen and water management methods. To achieve the set objectives, field and pot experiments were carried out at the Soil and Irrigation Research Centre, University of Ghana, Kpong in 2015 and 2016 cropping season. The field experiment was laid in a split plot design with water management treatments as main plots and N fertilizer as subplot treatment. The pot experiment was carried out in a randomized complete block design with five replications. The water management treatments were; continuous submergence (SC), alternate wet and dry soil condition (AWD) and moist soil condition (MC). Nitrogen fertilizer rates were; no N fertilizer (N0), 60 kg N/ha (N1) and 90 kg N/ha (N2). Data such as yield and yield parameters of rice, water use, water productivity, costs and returns were recorded. Results obtained from both pot and field experiments revealed that rice yields were at par in AWD and SC but yields were lower in MC treatment. With N fertilizer, higher yields were observed with 90 kg N/ha. The interaction effect of submerged with 90 kg N/ha gave the highest grain yield. N fertilizer effect on water use and water productivity was ranked as N2 > N1 > N0 while water management effect on water use and

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Section: Effect Of Water Management On Water Use Percentage Of Watermentioning

confidence: 99%

Section: Effect Of Water Management On Water Use Percentage Of Watermentioning

confidence: 99%

Agronomic, Water Productivity and Economic Analysis of Irrigated Rice under Different Nitrogen and Water Management Methods

Yakubu¹,

Ofori²,

Amoatey³

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In the above equations, it is assumed that there is no capillary rise in both freely draining and puddled soils. Capillary rise from puddled (paddy) soils is ignored as the plough layer remains saturated for a considerable length of the crop growth period and is at a higher moisture potential than the capillary fringe at deeper depths (Odhiambo & Murthy, 1996).…”

Section: Proposed Decision Support System (Impasse Ver 10)mentioning

confidence: 99%

Long‐term effects of various crop rotations for managing salt‐affected soils through a field scale decision support system – a case study

Kaur

Malik

Paul

2007

Soil Use and Management

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Appropriate crop rotations coupled to water use plans are the basic means of managing salt-affected soils. Recommendation of suitable crop rotations for salt-affected land requires prediction of their long-term impact on soil salinity/sodicity build-up and consequent crop yield reduction. This is conventionally achieved through long-term field experiments. However, such evaluations are site specific, expensive and time consuming. Appropriate decision support systems (DSS) can be a cost-effective means in such cases. This study demonstrates the application of one such DSS for recommending the best crop rotation for a salt-affected field in Gurgaon district of Haryana (India). Before application, the DSS was extensively validated on 11 farmer's fields and one experimental field in Gurgaon and Karnal districts of Haryana. The DSS gave realistic estimates of root zone soil salinity/sodicity and relative crop yield reductions under the local management practices. These estimates were associated with absolute mean relative errors ranging between 0.02 and 0.24. Ten-year impact assessments of existing (i.e. paddy-wheat, P-W) and 10 alternative crop rotation plans with the validated DSS showed that pearl millet-based sequences were, environmentally and agronomically, the most suitable options for the test field. However, a cost-benefit analysis of DSS-simulated average annual crop yields, under various crop rotations, showed that the economic return of pearl millet-based sequences was about 13% less than fallow-wheat (F-W) rotations and 4% less than P-W rotations. Hence F-W was recommended as the most beneficial environmental choice and economically the most robust alternative crop sequence for the salt-affected field.

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“…Quantifying water fluxes over a given soil profile may be achieved either through installing different sensors at appropriate soil depths, or by modeling the movement of water in the porous media, using pedo‐transfer functions and agro‐climatological information. Investigating water balance at the root zone level has several applications, but perhaps the most important one is the improvement of irrigation scheduling (Odhiambo and Murty ; Garcia Prats and Guillem Pico, ). Modeling and/or monitoring water balance at field scale has also a wide variety of applications, such as performing economical and hydrological analysis of on‐farm reservoirs (Panigrahi et al ., ; Roost et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Water balance of irrigated areas: a remote sensing approach

Taghvaeian

Neale

2011

Hydrological Processes

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Abstract:An efficient management of our precious water resources is not possible without acquiring a comprehensive and detailed understanding on water fluxes at irrigated areas. In the past few decades, agricultural water balance analyses have been carried out at a wide variety of temporal (from hourly to annual) and spatial (from plant root zone to basin) scales. Scheme-wide water balance analyses, in particular, provide information on the amount of water supplied to irrigation schemes and its fate. This paper attempts to summarise the results of previous studies in quantifying water balance components of irrigation schemes, as well as to present challenges and opportunities of conducting such research projects. With recent improvements in air-and space-borne imaging of land surfaces, remote sensing techniques nowadays can serve as a powerful tool in monitoring/modeling water movements, at or near real time. Remote sensing contribution to water balance studies could be as simple as developing crop classification maps, or as complicated as estimating the spatially distributed evapotranspiration, which is perhaps the most critical water flux in irrigated areas. Therefore, this paper also aims to review the few studies that have incorporated satellite-derived products in their water budget analysis. Finally, the results of a case study from the southern California are presented to better demonstrate the potential of remotely sensed data.

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Modeling water balance components in relation to field layout in lowland paddy fields. II: Model application

Cited by 16 publications

References 3 publications

Agronomic, Water Productivity and Economic Analysis of Irrigated Rice under Different Nitrogen and Water Management Methods

Agronomic, Water Productivity and Economic Analysis of Irrigated Rice under Different Nitrogen and Water Management Methods

Long‐term effects of various crop rotations for managing salt‐affected soils through a field scale decision support system – a case study

Water balance of irrigated areas: a remote sensing approach

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