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Ozier‐Lafontaine, Harry; Lecompte, François; Sillon, J.F.

doi:10.1023/a:1004461130561

Cited by 71 publications

(8 citation statements)

References 26 publications

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“…This approach has been tested for roots and shoots of several tropical tree species (van Noordwijk and Purnomosidhi 1995;van Noordwijk and Mulia 2002). Building on the numerical version of the model (Spek and van Noordwijk 1994), Ozier-Lafontaine et al (1999) developed a recursive algorithm, the FracRoot model, for reproducing and visualizing complete-tree root systems based on proximal root characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Comparison of FracRoot results with field data indicated that the model tended to overestimate root mass (Ozier-Lafontaine et al 1999). Two possible causes for this tendency are that (1) the model does not take into account root turnover but simulates an idealized root system and (2) the model is based on the self-similarity assumption, i.e., that the root system maintains a similar form over a range of scales.…”

Section: Introductionmentioning

confidence: 99%

“…growing in a temperate short-rotation plantation. The specific objectives of the study were to (1) test whether the accuracy of the root architecture model FracRoot (Ozier-Lafontaine et al 1999;Salas et al 2004) can be improved by introducing a stochastic root turnover factor to the model; (2) test whether replacing mean parameter values with distributions laws improves the accuracy of the model for root simulation; and (3) evaluate the combined effects of turnover and parameter distributions on the accuracy of the model.…”

Section: Introductionmentioning

confidence: 99%

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Effects of turnover and internal variability of tree root systems on modelling coarse root architecture: comparing simulations for young Populus deltoides with field data

Nygren

Ozier‐Lafontaine

2009

Can. J. For. Res.

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The behaviour of the FracRoot model, which describes coarse-root architecture based on proximal root diameters using a recursive algorithm, was studied using field data on Populus deltoides Bartr. ex Marsh. in a short-rotation plantation. Roots were described as a branching, hierarchical network of connected links. Diameters of daughter links were estimated from the diameter of the mother link using scaling parameter p and allocation parameter q, which were based on sharing of the root cross-sectional area by daughter links. Parameters were estimated from complete root excavations. The length of each link and the vertical and horizontal branching angle distributions were recorded. Parameter p values were distributed log-normally, and q values followed a beta distribution both for the whole root system and within 5 mm link diameter classes. Including the variability of p and q in the model did not significantly improve root length estimates compared with the use of mean p and q values over all branching points. Including a coarse-root turnover factor based on field-observed evidence on root mortality improved the model fit to field data. Root length was more sensitive to parameter values and turnover factor than root mass. Field observations and the importance of the turnover factor to simulation accuracy suggest that coarse-root turnover should be considered in root research, at least under conditions of strong competition or other external stress.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of turnover and internal variability of tree root systems on modelling coarse root architecture: comparing simulations for young Populus deltoides with field data

Nygren

Ozier‐Lafontaine

2009

Can. J. For. Res.

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“…The soils around the roots were washed off through jet of water [5], [6]. The root samples were distributed in to the trays containing a film of water and were scanned by the scanner (Skener Perf.…”

Section: Iimaterials and Methodsmentioning

confidence: 99%

Effects of Fertigation on Root and Plant Nutrient Distribution of Field Grown Tomato (Lycopersicon esculentum Mill.)

2016

IJRCMCE

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Abstract-Fertigation is widely adapted for tomato production in Thailand as it is an efficient method for fertilizer application. However, its mechanism, especially the influence on root and plant nutrient distribution which is the critical aspect for nutrient uptake, has been rarely reported. A field experiment was conducted during the dry season in 2013 to investigate the impact of fertigation on tomato root and plant nutrient distribution in the soil profile. Fertigation and conventional (solid) fertilizer application with the same amount of nutrients and duration of application were compared under drip irrigation system. The results showed that fertigation was more efficient than solid fertilizer application, resulting in better growth, higher fruit yield and fertilizer use efficiency. The results also indicated that fertigation had a better root system than solid fertilizer application. The roots under fertigation distributed more vertically and horizontally than those under solid fertilizer application. Fertigation produced more small roots (0.01-1.00 mm) and medium roots (1.01-2.00 mm) but less large roots (2.01-3.00 mm) than solid fertilizer application. More distribution of available form of primary nutrients (N, P and K) to root zone was also found under fertigation system. Tomato is an important economic vegetable in Thailand. In 2012, total growing area was about 6,280 ha [1]. Its growing area is mainly in the Northeast. The average yield is very low (20.7 t ha -1 ) due to poor management practices, plant pests and unfavorable environmental conditions. Furrow irrigation system used to be a common practice for the tomato growers in this area. The major drawback of furrow irrigation is its ineffectiveness in the coarse texture soil with low water use efficiency. Drip irrigation as the most efficient irrigation method is rapidly expanding and highly recommended in this area.Beside water application, solid fertilizer application (common practice for farmers) in this area is ineffective. Leaching is the main fertilizer loss as the soil is sandy with low water holding capacity. Chanthai et al.[2] compared fertigation and solid fertilizer application for tomato production under drip irrigation system. They prevented leaching of fertilizer by controlling irrigated water at root zone and covered the soil with plastic sheet to prevent excessive rain fall. Y. Rimcharoen is a graduate student of Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand S. Wonprasaid* is with Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand They found that fertigation produced greater tomato yield and nutrient use efficiency than solid fertilizer application with the same amount of nutrients. In their experiment, fertilizer was applied only 2 times for the solid fertilizer application treatment while for fertigation treatment fertilizer was applied 8 times. The more efficiency of nutrient application under fertigation th...

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“…166 La restriction peut viser l'intérêt du disposant ou d'un tiers ; elle peut favoriser la conservation du bien dans la famille. La restriction peut aussi viser la protection du bénéficiaire ; elle entend le protéger en raison de son inexpérience.…”

Section: Des Conditions Licitesunclassified

Le Testateur Et Son Clone Inavoué, Le Juge Ou L’art De Concilier Formalisme Et Volontarisme Dans L’interprétation Testamentaire

Ciotola¹

2005

Revue du notariat

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Untitled

Cited by 71 publications

References 26 publications

Effects of turnover and internal variability of tree root systems on modelling coarse root architecture: comparing simulations for young Populus deltoides with field data

Effects of turnover and internal variability of tree root systems on modelling coarse root architecture: comparing simulations for young Populus deltoides with field data

Effects of Fertigation on Root and Plant Nutrient Distribution of Field Grown Tomato (Lycopersicon esculentum Mill.)

Le Testateur Et Son Clone Inavoué, Le Juge Ou L’art De Concilier Formalisme Et Volontarisme Dans L’interprétation Testamentaire

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