Plant available water
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie/South African Journal of Science and Technology
| Field | Value | |
| Title | Plant available water Plantbeskikbare water | |
| Creator | Nel, P. C. Annandale, J. G. | |
| Description | The amount of water in the soil available for plant use, as well as water use efficiency, can be largely influenced by managerial practices. Field capacity is a useful arbitrary upper limit of plant available water (PAW), but factors such as redistribution of soil water, evaporative demand and root distribution may influence it. The lower limit of PAW is often referred to as the wilting coefficient, below which soil water is unavailable to plants. Yield losses occur long before the lower limit of available water is reached. Leaf water potential, transpiration, photosynthesis and various other plant processes are drastically reduced after soil water content has reached a certain threshold level. The presence of this threshold soil water content is being questioned by some researchers. Various soil, plant and climatic factors influence PAW. Laboratory measurements of PAW have a few serious shortcomings. In situ measurements are time consuming and for this reason work is still being done on streamlining laboratory methods. Die hoeveelheid water in die grand wat beskikbaar is vir benutting dearplante, en waterverbruiksdoeltreffendheid, kan wesentlik deur bestuurspraktyke beinvloed word. Veldkapasiteit is ’n bruikbare arbitrere boonste limiet van plantbeskikbare water (PBW), maar faktore soos herdistribusie van grondvog, verdampingsaanvraag en wortelverspreiding mag ’n rol speel. Daar word dikwels na die onderste limiet van PBW verwys as verwelkingskoeffisient. Onderkant hierdie limiet is grondwater nie beskikbaar vir plante nie. Opbrengsverliese vind plaas lank voordat hierdie uitdrogingsvlak bereik is. Blaarwaterpotensiaal, transpirasie, fotosintese en verskeie ander plantprosesse neem drasties af nadat grondwaterinhoud ’n bepaalde drumpelwaarde bereik het. Die drumpel-grondwaterinhoud-konsep word deur sommige navorsers bevraagteken. Verskeie grond-, plant- en klimaatsfaktore het ’n wesentlike invloed op PBW. Laboratoriumbepalings van PBW is onderhewig aan verskeie tekortkominge. In situ-bepalings op die land is betroubaarder. Omdat laasgenoemde tydrowend is, word steeds gewerk aan die verfyning van laboratoriummetodes. | |
| Publisher | AOSIS | |
| Date | 1987-03-17 | |
| Identifier | 10.4102/satnt.v6i3.953 | |
| Source | Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie; Vol 6, No 3 (1987); 109-114 Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie; Vol 6, No 3 (1987); 109-114 2222-4173 0254-3486 | |
| Language | eng | |
| Relation |
The following web links (URLs) may trigger a file download or direct you to an alternative webpage to gain access to a publication file format of the published article:
https://journals.satnt.aosis.co.za/index.php/satnt/article/view/953/1975
|
|
ADVERTISEMENT
