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ROOT UPTAKE [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2022-02-24

English

Subject field(s)
  • Soils (Agriculture)
CONT

Efficient fertilization and [nitrogen] management require that crop nitrogen demand is satisfied, and [nitrogen] is applied coincident with root uptake.

French

Domaine(s)
  • Sols (Agriculture)
CONT

Le besoin en azote des cultures [...] correspond à la quantité d'azote à faire absorber par [des cultures] pour atteindre [un] objectif de production.

Spanish

Save record 1

Record 2 2015-07-10

English

Subject field(s)
  • Plant Biology
DEF

Entry of substances into roots from the rooting medium, driven by free energy potential difference between root and rooting medium.

CONT

The uptake of nutrient ions into roots occurs by both passive and active processes. The passive processes include mass flow in transpired water, diffusion and the adsorption of ions by components of root cells... Active processes are involved when the needs for nutrient ions are not met by passive uptake.

French

Domaine(s)
  • Biologie végétale
CONT

De plus, la teneur élevée en Si [silicium] chez la prêle ne pouvait s'expliquer seulement par une absorption passive par le flux de transpiration.

Spanish

Save record 2

Record 3 2007-08-29

English

Subject field(s)
  • Plant Biology
CONT

Nutrient uptake by crops depends on nutrient supply in the soil, root surface area, and root activity. Roots are able to absorb only the nutrients that come into contact with living and active cells, so P uptake is dependent on the condition of a plant's root system. Nutrients contact the root surface by three mechanisms : diffusion, mass/bulk flow, and root interception.

French

Domaine(s)
  • Biologie végétale
CONT

La surface racinaire constitue un objet d'étude primordial à plus d'un titre; elle constitue un interface original non seulement par ses propriétés intrinsèques (encore mal connues), mais par les processus qui s'y développent : transfert (eau, ions), échange d'informations (molécules-signal), régénération et développement spatial, biofilms.

Spanish

Save record 3

Record 4 2003-09-08

English

Subject field(s)
  • Botany
  • Horticulture
DEF

The unsuberized portion of a root proximal to the tip(which has not yet developed xylem elements), the main zone of uptake. However, the formation of suberin lamellae may be less effective in sealing off access to the stele from the cortex than commonly believed.

French

Domaine(s)
  • Botanique
  • Horticulture
DEF

Région formée d'un duvet de poils très fins qui servent à l'absorption de l'eau et des matières minérales chez les plantes et constituant la 3ème partie d'une racine en les comptant de bas en haut.

OBS

Les termes «région absorbante» et «assise pilifère» sont aussi tirés de «Biologie, Québec» de René Malouin, PUL, 1963, p. 63 et 68.

Spanish

Campo(s) temático(s)
  • Botánica
  • Horticultura
DEF

Parte de la raíz que lleva pelos absorbentes.

Save record 4

Record 5 2003-02-24

English

Subject field(s)
  • Plant Biology
  • Soil Science
  • Drainage and Irrigation (Agric.)
CONT

The driving force for root uptake is the water potential difference between soil and plant. Water is transported from high potential to low. There are two principally different resistances to water transfer from the soil to the exchangeable pool in the plant. In the soil, the resistance depends on soil characteristics and soil water potential, while in the plant, biological factors regulate the resistance. The first resistance is called the soil-root resistance(rr) and the second is called the plant resistance(rp) and they are coupled in series, i. e. a water molecule has to path both resistances.

CONT

Access to water can be more difficult because the soil close to the roots tend to dry more quickly. The resistance to water transfer towards the roots gets stronger. But water uptake is essentially limited by the heterogeneous distribution of the roots in the soil.

Key term(s)
  • water transfer resistance
  • liquid water transfer resistance

French

Domaine(s)
  • Biologie végétale
  • Science du sol
  • Drainage et irrigation (Agriculture)
CONT

[...] la résistance au transfert d'eau liquide dans le sol ou le continuum sol-plante est le quotient de la différence de potentiel hydrique total [delta psi]T entre deux niveaux par le flux liquide [phi] : R = [delta psi]T/[phi].

OBS

résistance : Paramètre qui figure dans les équations de transfert de gaz, de liquide ou de chaleur exprimant le flux en fonction d'une différence de concentration, de potentiel hydrique ou de température.

Spanish

Save record 5

Record 6 2000-12-12

English

Subject field(s)
  • Plant Biology
CONT

A primary role of the root system is the absorption of water.... Water Uptake. With the advent of rainfall, water is absorbed from the soil through the epidermis and passes to the xylem via the cortex and endodermis.

CONT

Any soil condition that influences absorption of water by the roots affects the transpiration rate. When the soil becomes very cold, absorption of water is retarded, even though soil water may be available.

Key term(s)
  • uptake of water

French

Domaine(s)
  • Biologie végétale
DEF

Pénétration d'eau dans un milieu inerte ou vivant.

OBS

En agronomie, ce terme désigne habituellement le flux d'eau pénétrant du sol dans la plante (par les radicelles ou les poils absorbants), mais aussi dans des conditions plus rares, de l'atmosphère dans les feuilles.

OBS

Le mécanisme de l'absorption correspond à la succession de causes à effets suivante : transpiration - dessèchement de la feuille - chute du potentiel hydrique foliaire - gradient de potentiel hydrique entre le sol et les feuilles - flux liquide du sol vers les feuilles et les autres organes aériens.

Spanish

Campo(s) temático(s)
  • Biología vegetal
Save record 6

Record 7 2000-11-01

English

Subject field(s)
  • Botany
CONT

Near to the growing root tips, root hairs commonly develop; their function is to greatly increase the surface area for the uptake of water and its dissolved minerals.

Key term(s)
  • feeder roots

French

Domaine(s)
  • Botanique
DEF

Organes ressemblant à des poils qui se développent près de l'extrémité des radicelles.

CONT

Les poils absorbants permettent l'absorption des substances nutritives du sol.

CONT

Les racines se terminent après quelques ramifications par des radicelles; elles portent à leurs extrémités les poils absorbants prélevant dans le sol l'eau et les matières minérales nécessaires à l'alimentation de la plante.

Spanish

Save record 7

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