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Jourdan, Christophe; Rey, Hervé

doi:10.1023/a:1004290024473

Cited by 94 publications

(27 citation statements)

References 33 publications

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“…Here the axis categories correspond to the axis orders (except for reiterates) but it is important to note that this is not always the case (Atger and Edelin 1994b). Jourdan and Rey working on oil-palm found that the adventitious root system is organized and also found a root architectural unit (Jourdan and Rey 1997a). Atger also highlighted the organization of a root system with an architectural unit in five dicotyledonous plants (Atger 1992).…”

Section: Architectural Unitsmentioning

confidence: 99%

“…In order to complete and reinforce our morphological observations, quantitative variables were acquired using the following descriptors: length, growth rate, length of apical unbranched zone (LAUZ), number of lateral roots, inter-branch distance (IBD), basal diameter and emission angle. These parameters are frequently used in morphological root system studies (Harada et al 1993, Jourdan and Rey 1997a. Concerning length, the maximal lengths observed were reported.…”

Section: Root Descriptorsmentioning

confidence: 99%

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Architectural analysis of root system of sexually vs. vegetatively propagated yam (Dioscorea rotundata Poir.), a tuber monocot

et al. 2008

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International audienceArchitectural descriptors were used to understand root system structure and development in white yam (Dioscorea rotundata Poir., Dioscoreaceae), a tuber monocot. Observations were made on seedlings and plant derived from tuber fragments, cultivated in greenhouses over a developmental cycle. This study demonstrated that both seedlings and plants derived from tubers have two distinct root systems that are highly organized. The first (seminal or tubercular) has been called the temporary root system which is small and short lived. The architectural unit here is made up of two root axis categories. The second (adventitious in both cases) has been called the definitive root system. It is larger and has a far longer lifespan than temporary root systems. The architectural unit here is made up of three root axis categories. Adventitious root systems are formed by structural repetitions of their own architectural unit. The temporary and definitive root systems possess the same structural and functional properties and become established and succeed one another in time following an identical developmental sequence. Neo tuber development is coupled with the root system development. Our results highlight to what extent it is important to study simultaneously the different parts of a root system in order to understand its development. This study confirms how architectural tools can be used to understand root system structure and development and prove accurate informations on root system development for use in agricultural management

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Section: Architectural Unitsmentioning

confidence: 99%

Section: Root Descriptorsmentioning

confidence: 99%

Architectural analysis of root system of sexually vs. vegetatively propagated yam (Dioscorea rotundata Poir.), a tuber monocot

et al. 2008

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“…The amount of N and K in the leachate obtained at 120 cm depth are considered as leaching losses since most oil palm roots are found within the top 60 cm of the soils [7,39] . The quantity of N and K leaching losses in this study were a function of the volume of water in the soil, fertilizer treatment and rate of nutrient uptake by the palm roots.…”

Section: N and K Leaching Lossesmentioning

confidence: 99%

Effect of N and K Fertilizers on Nutrient Leaching and Groundwater Quality under Mature Oil Palm in Sabah during the Monsoon Period

Tung¹,

Yusoff²,

Majid³

et al. 2009

American J. of Applied Sciences

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Problem statement:The oil palms are mainly grown in the humid tropics with high rainfall. Soluble Nitrogen (N) and Potassium (K) fertilizers are commonly required by the oil palm plantations to maximize palm productivity due to the highly weathered soils with low fertility. Thus, leaching losses of N and K nutrients may be unavoidable and these nutrients may move further downward and eventually cause groundwater pollution. This study reports the leaching of N and K nutrients in a mature oil palm field as affected by fertilizer rates and soil depths and its effect on groundwater quality during the monsoon period in Tawau soil depths of 60 and 120 cm, respectively. The transformation of NH 4 -N to NO 3 -N was not a major process during the monsoon period. The leaching losses of inorganic N were 1.0 and 1.6% of the applied fertilizer for N1P2K0 and N1P2K1 respectively. For K, the leaching losses were 5.3 and 2.4% for N0P2K1 and N1P2K1 respectively. The concentrations of NH 4 -N, NO 3 -N and K in groundwater ranged from 0.23-2.7, 0.07-0.25 and 0.63-9.54 mg L −1 , respectively. Conclusion/Recommendations: N and K concentrations in the soil solution decreased with soil depth and their leaching losses were related to rainfall pattern, fertilizer treatment and nutrient uptake by roots. Groundwater quality was not affected by the applications of N and K fertilizers at the optimum rates for mature oil palms.

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“…For the juvenile phase of trees it is possible to use growth chambers and field rhizotrones to actually observe the root development over time (Le Roux and Pagès 1994;Jourdan and Rey 1997, Pagès and Bengough 1997, Pagès et al 2004. In contrast, observations of tree-root architecture over time-spans of decades are simply not possible.…”

mentioning

confidence: 99%

“…Root-dynamic studies at a long-term scale have only been realized in two ways (Danjon and Reubens 2008), either using chronosequences or using dendroecological studies: (i) Chronosequences are frequently used to analyze different age stages (Jourdan and Rey 1997;King et al 2007;Genet et al 2009) and to get information about root development over time. However, even if the site factors are comparable it is still not possible to analyze the reaction of individual trees on specific environmental conditions or events.…”

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confidence: 99%

A tool to model 3D coarse-root development with annual resolution

et al. 2011

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Dynamic root-development models are indispensable for biomechanical and biomass allocation studies, and also play an important role in understanding slope stability. There are few rootdevelopment models in the literature, and there is a specific lack of dynamic models. Therefore, the aim of this study is to develop a 3D growth-development model for coarse roots, which is species independent, as long as annual rings are formed. In order to implement this model, the objectives are (I) to interpolate annual growth layers, and (II) to evaluate the interpolations and annual volume computations. The model developed is a combination of 3D laser scans and 2D tree-ring data. A FARO laser ScanArm is used to acquire the coarse-root structure. A MATLAB program then integrates the ringwidth measurements into the 3D model. A weighted interpolation algorithm is used to compute cross sections at any point within the model to obtain growth layers. The algorithm considers both the root structure and the ring-width data. The model reconstructed ring profiles with a mean absolute error for mean ring chronologies of <9% and for single radii of <20%. The interpolation accuracy was dependent on the number of input sections and root curvature. Total volume computations deviated by 3.5-6.6% from the reference model. A new robust root-modelling tool was developed which allows for annual volume computations and sophisticated root-development analyses.

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Untitled

Cited by 94 publications

References 33 publications

Architectural analysis of root system of sexually vs. vegetatively propagated yam (Dioscorea rotundata Poir.), a tuber monocot

Architectural analysis of root system of sexually vs. vegetatively propagated yam (Dioscorea rotundata Poir.), a tuber monocot

Effect of N and K Fertilizers on Nutrient Leaching and Groundwater Quality under Mature Oil Palm in Sabah during the Monsoon Period

A tool to model 3D coarse-root development with annual resolution

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