An Entity of Type: Thing, from Named Graph: http://dbpedia.org, within Data Space: dbpedia.org

Vapour-pressure deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated, water will condense out to form clouds, dew or films of water over leaves. It is this last instance that makes VPD important for greenhouse regulation. If a film of water forms on a plant leaf, it becomes far more susceptible to rot. On the other hand, as the VPD increases, the plant needs to draw more water from its roots. In the case of cuttings, the plant may dry out and die. For this reason the ideal range for VPD in a greenhouse is from 0.45 kPa to 1.25 kPa, ideally sitting at around 0.85 kPa. As a general rule, most plants grow well at VPDs of between 0.8 and 0.95 kPa.

Property Value
dbo:abstract
  • Das Sättigungsdefizit, auch Dampfhunger oder eingeschränkt Dampfdruckdifferenz, bringt zum Ausdruck, wie stark ein Gas bezüglich einer Komponente gesättigt ist. Es wird durch die Differenz zwischen dem Sättigungsdampfdruck und dem Dampfdruck des Gases errechnet. Geht diese Differenz gegen Null, so nähert sich das Gas einer Sättigung an. Je größer die Differenz, desto weiter entfernt ist das Gas von einer Sättigung. Das Sättigungsdefizit ist hierbei, wie die Sättigung selbst, stark temperatur-, jedoch kaum druckabhängig. Es ist auch möglich diese Differenz mithilfe der Konzentration oder Masse darzustellen, weshalb man auch weitere Formeln für das Sättigungsdefizit formulieren kann. Diese sind jedoch im Allgemeinen wenig verbreitet. (de)
  • Vapour-pressure deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated, water will condense out to form clouds, dew or films of water over leaves. It is this last instance that makes VPD important for greenhouse regulation. If a film of water forms on a plant leaf, it becomes far more susceptible to rot. On the other hand, as the VPD increases, the plant needs to draw more water from its roots. In the case of cuttings, the plant may dry out and die. For this reason the ideal range for VPD in a greenhouse is from 0.45 kPa to 1.25 kPa, ideally sitting at around 0.85 kPa. As a general rule, most plants grow well at VPDs of between 0.8 and 0.95 kPa. In ecology, it is the difference between the actual water vapour pressure and the saturation water vapour pressure at a particular temperature. Unlike relative humidity, vapour-pressure deficit has a simple nearly straight-line relationship to the rate of evapotranspiration and other measures of evaporation. (en)
  • Дефіцит вологості (від лат. deficit — недостача) — різниця між пружністю насичення (Е) та фактичною пружністю (е) повітря за даного тиску та температури, визначена в мілібарах. Характеризує умови тепловіддачі через випаровування вологи з будь-якої поверхні. (uk)
dbo:thumbnail
dbo:wikiPageID
  • 3291191 (xsd:integer)
dbo:wikiPageLength
  • 5110 (xsd:nonNegativeInteger)
dbo:wikiPageRevisionID
  • 1115696046 (xsd:integer)
dbo:wikiPageWikiLink
dbp:wikiPageUsesTemplate
dcterms:subject
rdfs:comment
  • Дефіцит вологості (від лат. deficit — недостача) — різниця між пружністю насичення (Е) та фактичною пружністю (е) повітря за даного тиску та температури, визначена в мілібарах. Характеризує умови тепловіддачі через випаровування вологи з будь-якої поверхні. (uk)
  • Das Sättigungsdefizit, auch Dampfhunger oder eingeschränkt Dampfdruckdifferenz, bringt zum Ausdruck, wie stark ein Gas bezüglich einer Komponente gesättigt ist. Es wird durch die Differenz zwischen dem Sättigungsdampfdruck und dem Dampfdruck des Gases errechnet. (de)
  • Vapour-pressure deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated, water will condense out to form clouds, dew or films of water over leaves. It is this last instance that makes VPD important for greenhouse regulation. If a film of water forms on a plant leaf, it becomes far more susceptible to rot. On the other hand, as the VPD increases, the plant needs to draw more water from its roots. In the case of cuttings, the plant may dry out and die. For this reason the ideal range for VPD in a greenhouse is from 0.45 kPa to 1.25 kPa, ideally sitting at around 0.85 kPa. As a general rule, most plants grow well at VPDs of between 0.8 and 0.95 kPa. (en)
rdfs:label
  • Sättigungsdefizit (de)
  • Vapour-pressure deficit (en)
  • Дефіцит вологості (uk)
owl:sameAs
prov:wasDerivedFrom
foaf:depiction
foaf:isPrimaryTopicOf
is dbo:wikiPageDisambiguates of
is dbo:wikiPageRedirects of
is dbo:wikiPageWikiLink of
is foaf:primaryTopic of
Powered by OpenLink Virtuoso    This material is Open Knowledge     W3C Semantic Web Technology     This material is Open Knowledge    Valid XHTML + RDFa
This content was extracted from Wikipedia and is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License