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The effect of physical properties of soilless media on plant performance - A review
Year:
2004
Source of publication :
Acta Horticulturae
Authors :
Raviv, Michael
;
.
Volume :
644
Co-Authors:
Raviv, M., Dept. of Ornamental Hortic., Agricultural Research Org., P.O. Box 1021, Ramat Yishay 30095, Israel
Wallach, R., Seagram Center for Soil and Water Sciences, Faculty of Agriculture, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Blom, T.J., Dept. of Plant Agriculture/ HRIO, University of Guelph, Victoria Ave. 489, Vineland Station, ON L0R 2E0, Canada
Facilitators :
From page:
251
To page:
259
(
Total pages:
9
)
Abstract:
Moderate matric potential and oxygen deficiency reduce leaf water potential, net assimilation rate and transpiration and thus negatively affect plant productivity. Moderate matric potential in the porous media, usually accompanied by a sharp decrease in unsaturated hydraulic conductivity, leads to localized zones of very low matric potential adjacent to the root-medium interface. This phenomenon cannot be easily characterized using tensiometers and is the main limiting factor to water uptake by plant roots. Restricted water uptake results in low leaf water potential, leading to cessation of leaf and shoot expansive growth. Oxygen deficiency restricts root respiration, thus negatively affects water and nutrient uptake. If it persists, temperal loss of ion selectivity of the root membranes may occur, resulting in increased uptake of non-essential ions such as sodium. Water and oxygen status of the root zone can be manipulated at two stages. Firstly, they are affected by the choice of the medium, in respect to the crop needs, available management practices and climatic conditions, and secondly by the chosen strategy of irrigation control. The main physical properties of the medium that affect plant performance are discussed in the following review, as well as methods to affect the actual status of water and oxygen in the medium. Abbreviations: ET, evapotranspiration; NAR, net assimilation rate; NCER, net carbon exchange rate; ODR, oxygen diffusion rate; PPFD, photosynthetic photon flux density; WUE, water use efficiency.
Note:
Related Files :
Air porosity
Growing medium
hydraulic conductivity
Irrigation control
Leaf water potential
matric potential
Net assimilation rate
Root respiration
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Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
Conference paper
;
.
Language:
English
Editors' remarks:
ID:
19738
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:31
Scientific Publication
The effect of physical properties of soilless media on plant performance - A review
644
Raviv, M., Dept. of Ornamental Hortic., Agricultural Research Org., P.O. Box 1021, Ramat Yishay 30095, Israel
Wallach, R., Seagram Center for Soil and Water Sciences, Faculty of Agriculture, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Blom, T.J., Dept. of Plant Agriculture/ HRIO, University of Guelph, Victoria Ave. 489, Vineland Station, ON L0R 2E0, Canada
The effect of physical properties of soilless media on plant performance - A review
Moderate matric potential and oxygen deficiency reduce leaf water potential, net assimilation rate and transpiration and thus negatively affect plant productivity. Moderate matric potential in the porous media, usually accompanied by a sharp decrease in unsaturated hydraulic conductivity, leads to localized zones of very low matric potential adjacent to the root-medium interface. This phenomenon cannot be easily characterized using tensiometers and is the main limiting factor to water uptake by plant roots. Restricted water uptake results in low leaf water potential, leading to cessation of leaf and shoot expansive growth. Oxygen deficiency restricts root respiration, thus negatively affects water and nutrient uptake. If it persists, temperal loss of ion selectivity of the root membranes may occur, resulting in increased uptake of non-essential ions such as sodium. Water and oxygen status of the root zone can be manipulated at two stages. Firstly, they are affected by the choice of the medium, in respect to the crop needs, available management practices and climatic conditions, and secondly by the chosen strategy of irrigation control. The main physical properties of the medium that affect plant performance are discussed in the following review, as well as methods to affect the actual status of water and oxygen in the medium. Abbreviations: ET, evapotranspiration; NAR, net assimilation rate; NCER, net carbon exchange rate; ODR, oxygen diffusion rate; PPFD, photosynthetic photon flux density; WUE, water use efficiency.
Scientific Publication
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