scholarly journals Improving Irrigated Lowland Rice Water Use Efficiency under Saturated Soil Culture for Adoption in Tropical Climate Conditions

Water ◽  
2014 ◽  
Vol 6 (9) ◽  
pp. 2830-2846 ◽  
Author(s):  
Aimé Kima ◽  
Wen Chung ◽  
Yu-Min Wang
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Tropical Climate ◽  
Lowland Rice ◽  
Saturated Soil ◽  
Soil Culture ◽  
Climate Conditions ◽  
Use Efficiency ◽  
Rice Water

scholarly journals Yield and water use efficiency of cauliflower under irrigation different levels in tropical climate

2018 ◽  
Vol 13 (32) ◽  
pp. 1621-1632 ◽  
Author(s):  
Pacheco de Souza Adilson ◽  
Carvalho da Silva Andrea ◽  
Aki Tanaka Adriana ◽  
Euzébio de Souza Manoel ◽  
Pizzatto Mariana ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Tropical Climate ◽  
Use Efficiency ◽  
Different Levels

scholarly journals Interannual and Seasonal Variations in Ecosystem Transpiration and Water Use Efficiency in a Tropical Rainforest

Forests ◽  
2018 ◽  
Vol 10 (1) ◽  
pp. 14 ◽  
Author(s):  
Maricar Aguilos ◽  
Clément Stahl ◽  
Benoit Burban ◽  
Bruno Hérault ◽  
Elodie Courtois ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Soil Water ◽  
Water Use ◽  
Seasonal Variations ◽  
Radiation Effects ◽  
Global Radiation ◽  
Climate Conditions ◽  
Carbon Cycles ◽  
Use Efficiency ◽  
The Impact

Warmer and drier climates over Amazonia have been predicted for the next century with expected changes in regional water and carbon cycles. We examined the impact of interannual and seasonal variations in climate conditions on ecosystem-level evapotranspiration (ET) and water use efficiency (WUE) to determine key climatic drivers and anticipate the response of these ecosystems to climate change. We used daily climate and eddyflux data recorded at the Guyaflux site in French Guiana from 2004 to 2014. ET and WUE exhibited weak interannual variability. The main climatic driver of ET and WUE was global radiation (Rg), but relative extractable water (REW) and soil temperature (Ts) did also contribute. At the seasonal scale, ET and WUE showed a modal pattern driven by Rg, with maximum values for ET in July and August and for WUE at the beginning of the year. By removing radiation effects during water depleted periods, we showed that soil water stress strongly reduced ET. In contrast, drought conditions enhanced radiation-normalized WUE in almost all the years, suggesting that the lack of soil water had a more severe effect on ecosystem evapotranspiration than on photosynthesis. Our results are of major concern for tropical ecosystem modeling because they suggest that under future climate conditions, tropical forest ecosystems will be able to simultaneously adjust CO2 and H2O fluxes. Yet, for tropical forests under future conditions, the direction of change in WUE at the ecosystem scale is hard to predict, since the impact of radiation on WUE is counterbalanced by adjustments to soil water limitations. Developing mechanistic models that fully integrate the processes associated with CO2 and H2O flux control should help researchers understand and simulate future functional adjustments in these ecosystems.

Anthropogenic NOx emissions alter the intrinsic water-use efficiency (WUEi) for Quercus cerris stands under Mediterranean climate conditions

2010 ◽  
Vol 158 (9) ◽  
pp. 2841-2847 ◽  
Author(s):  
Rossella Guerrieri ◽  
Rolf Siegwolf ◽  
Matthias Saurer ◽  
Francesco Ripullone ◽  
Maurizio Mencuccini ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Mediterranean Climate ◽  
Nox Emissions ◽  
Climate Conditions ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency ◽  
Quercus Cerris

Rice Water Use Efficiency and Yield under Continuous and Intermittent Irrigation

2015 ◽  
Vol 107 (2) ◽  
pp. 442-448 ◽  
Author(s):  
Luis Antonio de Avila ◽  
Luiz Fernando D. Martini ◽  
Rafael F. Mezzomo ◽  
João Paulo Refatti ◽  
Rogério Campos ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Intermittent Irrigation ◽  
Use Efficiency ◽  
Rice Water

scholarly journals Production components, grain yield and water use efficiency of irrigated cowpea

2018 ◽  
Vol 8 (3) ◽  
pp. 396-403
Author(s):  
João Irene Filho ◽  
Aderson Soares de Andrade Júnior ◽  
José Orlando Piauilino Ferreira ◽  
Flávio Favaro Blanco ◽  
Milton José Cardoso
Keyword(s):  
Grain Yield ◽  
Water Use Efficiency ◽  
Water Use ◽  
Yield Performance ◽  
Climate Conditions ◽  
Cowpea Cultivars ◽  
Productive Potential ◽  
Use Efficiency ◽  
Main Components ◽  
Response To Water

Cowpea cultivars, which are indicated for irrigated cropping, are recommended without proper assessment of their productive potential and water use efficiency in response to water regimes in the soil from different production environments. The aim of this study was to evaluate the production components, the yield performance and the efficiency of water use of cowpea cultivars in response to the application of irrigation depths under the soil and climate conditions of Bom Jesus, PI. The experiment was performed from June to August 2011 in a soil classified as sandy-textured Fluvic Neosol. The study was conducted in a randomized blocks design, with four replicates. The treatments were arranged in subdivided plots (irrigation depths in plots and cultivars in subplots). The cultivars BRS Aracê (semi-prostrate) and BRS Tumucumaque (semi-erect) were submitted to five irrigation depths (108.2, 214.7, 287.9, 426.1 and 527.7 mm). The number of pods per plant and the weight of one hundred grains are the main components related to grain yield. The cultivar BRS Tumucumaque presented a better yield performance (1697.2 kg ha-1) than the cultivar BRS Aracê (1233.8 kg ha-1), with the application of the irrigation depths of 527.7 and 522.4 mm, respectively. The highest water use efficiency (0.420 kg m-3) is obtained with the application of the irrigation depth of 108.2 mm in both cultivars.

AmazonFACE – Assessing the response of Amazon rainforest functioning to elevated atmospheric carbon dioxide concentrations

2020 ◽  
Author(s):  
Anja Rammig ◽  
Katrin Fleischer ◽  
Sabrina Garcia ◽  
Nathielly Martins ◽  
Juliane Menezes ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Carbon Sink ◽  
Global Climate ◽  
Terrestrial Ecosystems ◽  
Amazon Rainforest ◽  
Past Century ◽  
Sink Strength ◽  
Climate Conditions ◽  
Use Efficiency

<p>The rapid rise in atmospheric CO<sub>2</sub> concentration over the past century is unprecedented. It has unambiguously influenced Earth’s climate system and terrestrial ecosystems. Elevated atmospheric CO<sub>2</sub> concentrations (eCO<sub>2</sub>) have induced an increase in biomass and thus, a carbon sink in forests worldwide. It is assumed that eCO<sub>2</sub> stimulates photosynthesis and plant productivity and enhances water-use efficiency – the so-called CO<sub>2</sub>-fertilization effect, which may provide an important buffering effect for plants during adverse climate conditions. For these reasons, current global climate simulations consistently predict that tropical forests will continue to sequester more carbon in aboveground biomass, partially compensating human emissions and decelerating climate change by acting as a carbon sink. In contrast to model simulations, several lines of evidence point towards a decreasing carbon sink strength of the Amazon rainforest. Reliable predictions of eCO<sub>2</sub> effects in the Amazon rainforest are hindered by a lack of process-based information gained from ecosystem scale eCO<sub>2</sub> experiments. Here we report on baseline measurements from the Amazon Free Air CO<sub>2</sub> Enrichment (AmazonFACE) experiment and preliminary results from open-top chamber (OTC) experiments with eCO<sub>2</sub>. After three months of eCO<sub>2</sub>, we find that understory saplings increased carbon assimilation by 17% (under light saturated conditions) and water use efficiency by 39% in the OTC experiment. We present our main hypotheses for the FACE experiment, and discuss our expectations on the potential driving processes for limiting or stimulating the Amazon rainforest carbon sink under eCO<sub>2</sub>. We focus on possible effects of eCO<sub>2</sub> on carbon uptake and allocation, nutrient cycling, water-use and plant-herbivore interactions, which need to be implemented in dynamic vegetation models to estimate future changes of the Amazon carbon sink.</p>

Effect of Gypsum Application and Irrigation Intervals on Clay Saline-Sodic Soil Characterization, Rice Water Use Efficiency, Growth, and Yield

2015 ◽  
Vol 7 (12) ◽  
pp. 208
Author(s):  
Emad M. Hafez ◽  
Waleed H. Abou El Hassan ◽  
Ibrahim A. Gaafar ◽  
Mahmoud F. Seleiman
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Growth And Yield ◽  
Sodic Soil ◽  
Rice Growth ◽  
The North ◽  
Irrigation Interval ◽  
Spikelets Per Panicle ◽  
Use Efficiency ◽  
Rice Water

<p>Saline-sodic soil is considered as a serious problem which could negatively affect rice water use efficiency, plant growth, and yield. Therefore, the objective of the current study was to investigate the effects of gypsum applied before sowing (i.e. gypsum and without gypsum) and irrigation interval treatments applied after anthesis (irrigation every 4, 6, 8 days) on chemical characterizations of clay saline-sodic soil. In addition, the effect of these treatments on rice growth, water use efficiency and related parameters and yield were investigated. A significant higher efficiency in reclamation of clay saline-sodic soil was obtained in terms of reducing SAR, Na<sup>+</sup> and EC when gypsum was applied and water was added every four or six days intervals in comparison to non-treated soil with gypsum and water added every eight days interval. The highest number of spikelets per panicle, ripened grains percent, grain and straw yields were obtained when rice plants were grown on soil treated with gypsum and irrigated every four and/or six days intervals compared to soil with no gypsum and irrigated every eight days interval. The highest water use efficiency was obtained from rice irrigated every six days interval. In conclusion, it may reduce the hazards of the saline-sodic soil due to application of gypsum which improved soil properties, rice growth and its productivity when plants were irrigated every four or six days intervals. This might be due to the valuable nutrient source of gypsum interns of Ca, which mitigated the toxicity caused by salts in saline soils. Gypsum can also be considered as an effective application for clay saline-sodic soil in the North Delta, Egypt.</p>

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