Water uptake and root distribution of soybeans, grain sorghum and corn

Righes, Afranio Almir

doi:10.31274/rtd-180814-6005

Cited by 5 publications

(7 citation statements)

References 1 publication

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“…In ST1, where sorghum was planted, Feddes' parameters for corn were used because sorghum is not available in the list. According to Righes (1980) sorghum and corn roots extract water from approximately the same soil depths and have similar average root density distribution.…”

Section: Root Water Uptake and Root Growthmentioning

confidence: 99%

Modelling groundwater recharge, actual evaporation and transpiration in semi-arid sites of the Lake Chad Basin: The role of soil and vegetation on groundwater recharge

Neukum

Santos²,

Ronelngar³

et al. 2022

Preprint

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Abstract. The Lake Chad Basin, located in the center of North Africa, is characterized by strong climate seasonality with a pronounced short annual precipitation period and high potential evapotranspiration. Groundwater is an essential source for drinking water supply as well as for agriculture and groundwater related ecosystems. Thus, assessment of groundwater recharge is very important although difficult, because of the strong effects of evaporation and transpiration as well as limited available data. A simple, generalized approach, which requires only limited field data, freely available remote sensing data as well as well-established concepts and models, is tested for assessing groundwater recharge in the southern part of the basin. This work uses the FAO-dual Kc concept to estimate E and T coefficients at six locations that differ in soil texture, climate, and vegetation conditions. Measured values of soil water content and chloride concentrations along vertical soil profiles together with different scenarios for E and T partitioning and a Bayesian calibration approach are used to numerically simulate water flow and chloride transport using Hydrus-1D. Average groundwater recharge rates and the associated model uncertainty at the six locations are assessed for the 2003–2016 time-period. Annual groundwater recharge varies between 6 and 93 mm and depends strongly on soil texture and related water retention and on vegetation. Interannual variability of groundwater recharge is generally greater than the uncertainty of the simulated groundwater recharge.

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Section: Root Water Uptake and Root Growthmentioning

confidence: 99%

Modelling groundwater recharge, actual evaporation and transpiration in semi-arid sites of the Lake Chad Basin: The role of soil and vegetation on groundwater recharge

Neukum

Santos²,

Ronelngar³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Sorghum and corn roots extract water from approximately the same soil depths and have similar average root density distribution, in comparison with other crops, e.g. soybeans (Righes, 1980). In the case of acacia in ST2, the adopted parameters correspond to deciduous trees.…”

Section: Root Water Uptake and Root Growthmentioning

confidence: 99%

Modelling groundwater recharge, actual evaporation and transpiration in semi-arid sites of the Lake Chad Basin: The role of soil and vegetation on groundwater recharge

Neukum

Santos

Ronelngar

et al. 2021

Preprint

View full text Add to dashboard Cite

Abstract. The Lake Chad Basin, located in the center of North Africa, is characterized by strong climate seasonality with a pronounced short annual precipitation period and high potential evapotranspiration. Groundwater is an essential source for drinking water supply as well as for agriculture and groundwater related ecosystems. Thus, assessment of groundwater recharge is very important although difficult, because of the strong effects of evaporation and transpiration as well as limited available data. A simple, generalized approach, which requires only a small number of field data, freely available remote sensing data, and well-established concepts and models, is tested for assessing groundwater recharge in the southern part of the basin. This work uses the FAO-dual Kc concept to estimate E and T coefficients at six locations that differ in soil texture, climate, and vegetation conditions. Measured values of soil water content and chloride concentrations along vertical soil profiles at these locations together with different scenarios for E and T partitioning and a Bayesian calibration approach are used to numerically simulate water flow and chloride transport. Average potential groundwater recharges and the associated model uncertainty at the six locations are assessed for the time-period 2003–2016. Model results show that interannual variability of groundwater recharge is generally higher than the uncertainty of the modelled groundwater recharge. Furthermore, the soil moisture dynamics at all locations are limited by water availability for evaporation in the uppermost part of the soil and by water uptake in the root zone rather than by the reference evapotranspiration.

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“…However, several studies emphasize that plants often fail to do so and experience severe drought stress despite a relatively high water availability in deeper root zones (Gessler et al, 2022; Passioura, 1983; Prechsl et al, 2015; Rasmussen et al, 2020). A major reason is that the root conductance ( K root , see Table 1 for abbreviations) in deeper layers usually is low since roots are less abundant (Haberle & Svoboda, 2015; Kemper et al, 2020; Righes, 1980) and less conductive compared with shallow roots (Dara et al, 2015; Müllers, Postma, Poorter, Kochs, et al, 2022; Zarebanadkouki et al, 2013). Therefore, a more effective acquisition of deep water would require to locally increase root conductance over time.…”

Section: Introductionmentioning

confidence: 99%

Deep‐water uptake under drought improved due to locally increased root conductivity in maize, but not in faba bean

Müllers

Postma

Poorter

et al. 2023

Plant Cell & Environment

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Moderate soil drying can cause a strong decrease in the soil‐root system conductance. The resulting impact on root water uptake depends on the spatial distribution of the altered conductance relatively to remaining soil water resources, which is largely unknown. Here, we analyzed the vertical distribution of conductance across root systems using a novel, noninvasive sensor technology on pot‐grown faba bean and maize plants. Withholding water for 4 days strongly enhanced the vertical gradient in soil water potential. Therefore, roots in upper and deeper soil layers were affected differently: In drier, upper layers, root conductance decreased by 66%–72%, causing an amplification of the drop in leaf water potential. In wetter, deeper layers, root conductance increased in maize but not in faba bean. The consequently facilitated deep‐water uptake in maize contributed up to 21% of total water uptake at the end of the measurement. Analysis of root length distributions with MRI indicated that the locally increased conductance was mainly caused by an increased intrinsic conductivity and not by additional root growth. Our findings show that plants can partly compensate for a reduced root conductance in upper, drier soil layers by locally increasing root conductivity in wetter layers, thereby improving deep‐water uptake.

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Water uptake and root distribution of soybeans, grain sorghum and corn

Cited by 5 publications

References 1 publication

Modelling groundwater recharge, actual evaporation and transpiration in semi-arid sites of the Lake Chad Basin: The role of soil and vegetation on groundwater recharge

Modelling groundwater recharge, actual evaporation and transpiration in semi-arid sites of the Lake Chad Basin: The role of soil and vegetation on groundwater recharge

Modelling groundwater recharge, actual evaporation and transpiration in semi-arid sites of the Lake Chad Basin: The role of soil and vegetation on groundwater recharge

Deep‐water uptake under drought improved due to locally increased root conductivity in maize, but not in faba bean

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