Transpiration/biomass ratio for carrots as affected by salinity, nutrient supply and soil aeration
✍ Scribed by U. Schmidhalter; J. J. Oertli
- Publisher
- Springer
- Year
- 1991
- Tongue
- English
- Weight
- 547 KB
- Volume
- 135
- Category
- Article
- ISSN
- 0032-079X
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✦ Synopsis
The influence of salinity, nutrient level and soil aeration on the transpiration coefficient, defined as amount of water transpired/unit biomass produced (transpiration/biomass ratio) of carrots was investigated under non-limiting conditions with respect to water supply.
Under optimum conditions and favorable nutrient supply, the transpiration coefficient amounted to 280-310g H 2 0 g-~ storage root dry weight (RDW). The transpiration coefficient did not change significantly up to salt concentration of 16 mS cm -~ in the soil solution under otherwise optimum conditions. Higher salt concentrations or low nutrient levels increased the transpiration coefficient to values of 390-540 g H 2 0 g-1 RDW. It is suggested that the transpiration coefficient is not affected by salinity as long as toxic effects and nutrient imbalances do not occur. The transpiration coefficient was not increased by impeded soil aeration. Biomass production was more negatively influenced by adverse soil conditions (salinity, low nutrient level, impeded soil aeration) than was the transpiration coefficient.