Water Uptake Response of Plant in Subsurface Precision Irrigation System

Abidin, Mohamad Shukri Bin Zainal; Shibusawa, Sakae; Ohaba, Motoyoshi; Li, Qichen; Marzuki, Bin Khalid

doi:10.1016/s1881-8366(13)80022-5

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…Recurring droughts and other extreme weather events threaten the sustainability of agriculture. While irrigation has the potential to boost agricultural productivity by~50% [3], it currently accounts for 9% of the southern Africa's arable land, and the figure decreases to 7% for all of Africa [4]. This is far below developing regions such as South America (41%) and Southeast Asia (29%) [5], with which we share similar development trajectories.…”

Section: Introductionmentioning

confidence: 93%

“…In addition to this classical Malthusian challenge, the growth of the middle class and accompanying resource demands presents an interesting conundrum from a resource management perspective. Africa's developmental ambitions, as laid out in Vision 2063 and other continental frameworks, make it clear that we are envisaging higher levels of development that will, among other things, see increased industrialisation on the continent [2,3]. If the continent proceeds with the current industrialisation paradigm, the resource strain will increase.…”

Section: Introductionmentioning

confidence: 99%

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Prospects for Improving Irrigated Agriculture in Southern Africa: Linking Water, Energy and Food

Mabhaudhi

Mpandeli

Nhamo

et al. 2018

Water

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Increasing agricultural productivity has always been a prominent feature on the regional agenda due to a high incidence of food and nutrition insecurity. This review assessed the current status of irrigated agriculture in southern Africa from a water–energy–food (WEF) nexus perspective. Gaps and opportunities for improving irrigated agriculture within the context of the WEF nexus were also assessed in terms of the feasible limits to which they can be exploited. Southern Africa faces water scarcity, and climate projections show that member states will face increased physical and/or economic water scarcity by as early as 2025, which will have negative impacts on water, energy and food production. Recurrent droughts experienced across the region reaffirm the sensitive issues of food and energy insecurity as well as water scarcity. Projections of an increasing population within the region indicate increased water, energy and food demand. With agriculture already accounting for about 70% of water withdrawals, increasing the area under irrigation will place additional demand on already strained energy grids and scarce water resources. This poses the question—is increasing irrigated agriculture a solution to improving water access, food security and energy supply? While there are prospects for increasing the area under irrigation and subsequent improvement in agricultural productivity, adopting a WEF nexus approach in doing so would mitigate trade-offs and unintended consequences. Consideration of the WEF nexus in integrated resources planning and management eliminates the possibilities of transferring problems from one sector to other, as it manages synergies and trade-offs. While it is acknowledged that improving water productivity in irrigated agriculture could reduce water and energy use while increasing yield output, there is a need to decide how such savings would then be reallocated. Any intervention to increase the irrigated area should be done in the context of a WEF nexus analytical framework to guide policy and decision-making. Technical planning should evolve around the WEF nexus approach in setting targets, as WEF nexus indicators would reveal the performance and impact of proposed interventions on any of the three WEF nexus components.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Prospects for Improving Irrigated Agriculture in Southern Africa: Linking Water, Energy and Food

Mabhaudhi

Mpandeli

Nhamo

et al. 2018

Water

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“…Values at other places were between 0.02 to -0.01% min -1 water uptake. Thus, the positive response of soil moisture a sign of root water uptake (Shukri et al, 2013). In this case, soil moisture at positions close to the water source, which was supposed to be the center of the crop rooting zone (Li et al, 2018b).…”

Section: Discussionmentioning

confidence: 99%

“…In this study, it can be assumed that the soil moisture crop water absorption (Shukri et al, 2013(Shukri et al, , 2014. After each water supply event, the moisture at the water source peaked with a time constant of about 30 min and then gradually decreased due to water uptake by roots.…”

Section: Discussionmentioning

confidence: 99%

A case study on water use efficiency in extreme water-saving cultivation of tomato plants

Li¹,

Sugihara²,

Shibusawa³

et al. 2021

Europ.J.Hortic.Sci.

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“…According to hydrotropism, each root serves as a water sensor which can perceive water potential gradients and modify their growth direction towards higher moisture [27]. It can be assumed that plants with fewer roots distributed in the dry soil can perceive wet zones more precisely, which is preferable in subsurface irrigation to make more e cient use of the irrigation water in the wet zone [8,54,55]. Our study provides a method to quantify root distribution that is against hydrotropic responses.…”

Section: Discussionmentioning

confidence: 99%

Hydrotropic Root Behavior in Water-Saving Cultivation: A High-Resolution Monitoring Study of Soil Water Dynamics

Li¹,

Sugihara²,

Shibusawa³

et al. 2021

Preprint

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BackgroundSubsurface irrigation has been confirmed to have high water use efficiency due to it irrigating only the crop root zone. Hydrotropism allows roots to grow towards higher water content areas for drought avoidance, which has research interests in recent years. However, most hydrotropism studies focused on a single root and were conducted in air or agar systems. The performance of hydrotropism in subsurface irrigation is not clear. ResultsWe developed a method to observe and analyze hydrotropism in soil under water-saving cultivation. A wet zone was produced around the whole root system based on using subsurface irrigation method and micro soil water dynamics were observed using high-resolution soil moisture sensors. This method enabled the observation and analysis of plant water absorption activities and the hydrotropic response of the root system. In the analysis, we first applied a high-pass filter and fast Fourier transform to the soil water dynamics data. The results indicated that the plant’s biological rhythm of photosynthetic activities can be identified from the soil moisture data. We then observed root growth in response to the dynamics of soil water content in the wet zone. We quantified root distribution inside and outside the wet zone and observed the shape of the root system from the cross-section of the wet zone. The results showed that the root hydrotropic response is not uniform for all roots of an individual plant. ConclusionsThis study verified the feasibility of using high-resolution soil moisture sensors to study root hydrotropic responses in soil during water-saving cultivation. To further evaluate a plant’s hydrotropic ability, it is necessary to use statistical analysis and/or a non-deterministic approach. Future studies may also explore developing an automated experimental system and robotic manipulations for getting steady repeatable observation of hydrotropism in water-saving cultivation.

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Water Uptake Response of Plant in Subsurface Precision Irrigation System

Cited by 8 publications

References 12 publications

Prospects for Improving Irrigated Agriculture in Southern Africa: Linking Water, Energy and Food

Prospects for Improving Irrigated Agriculture in Southern Africa: Linking Water, Energy and Food

A case study on water use efficiency in extreme water-saving cultivation of tomato plants

Hydrotropic Root Behavior in Water-Saving Cultivation: A High-Resolution Monitoring Study of Soil Water Dynamics

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