Stomatal resistance of three potato cultivars as influenced by soil water status, humidity and irradiance

Brown, D. M.; Dixon, Mike

doi:10.1007/bf02407561

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…The seed tubers in belg-2017 were from different origins whereas the seed tubers in belg-2018 were from the same origin. [79,80], the actual light intensity was larger than that most of the day, except during sunrise and sunset.…”

Section: Yield Variations With Topography and Among Cultivarsmentioning

confidence: 85%

Responses of Canopy Growth and Yield of Potato Cultivars to Weather Dynamics in a Complex Topography: Belg Farming Seasons in the Gamo Highlands, Ethiopia

et al. 2019

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Potato is an increasingly important crop in Ethiopia. The Gamo Highlands are one of the large potential potato producing regions in Ethiopia. The growing conditions are different from those in the temperate regions, where most of the agronomical expertise on potato has been developed. The influence of environmental conditions on the crop in the Gamo Highlands is poorly understood. We conducted field trials with eight potato cultivars in six locations and during two seasons. The canopy cover (CC) and plant height (PH) were measured with high temporal resolution and tuber yields were assessed as well. The experiments were conducted near our newly installed weather stations at different elevations. CC and PH were strongly correlated with temperature sum (Tsum). Tuber yields differed among elevations and cultivars. Nevertheless, these differences were poorly explained by environmental variables. We also found that no single cultivar performed best at all elevations. The number of branches was a predictor of yield, suggesting that radiation interception was limiting tuber growth. Tuber yield was optimal when the number of days to crop maturity was around 100–110 days. We conclude that Tsum is a predictor of crop growth, but environmental variables poorly explain yield variations, which calls for further investigation.

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Section: Yield Variations With Topography and Among Cultivarsmentioning

confidence: 85%

Responses of Canopy Growth and Yield of Potato Cultivars to Weather Dynamics in a Complex Topography: Belg Farming Seasons in the Gamo Highlands, Ethiopia

et al. 2019

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“…It was only after a couple of days of significant rainfall that the 6 vegetation recovered and latent-heat fluxes began to increase (Figures 3c and e). 7 Ozone deposition to the canopy and deposition velocity 6.6 mm s -1 (summary statistics are given in Table 1 while …”

Section: Data Processing and Reanalysismentioning

confidence: 99%

Measurements of ozone deposition to a potato canopy

Coyle¹,

Nemitz²,

Storeton-West³

et al. 2009

Agricultural and Forest Meteorology

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5Potatoes are an important staple crop, grown in many parts of the world. Although ozone 6 deposition to many vegetation types has been measured in the field, no data have been 7 reported for potatoes. Such measurements, including the latent heat flux, were made 8 over a fully-grown potato field in central Scotland during the summer of 2006, covering a 9 4-week period just after rainfall and then dry, sunny weather. The magnitude of the flux 10 was typical of many canopies showing the expected diurnal cycles. Although the bulk-11 canopy stomatal conductance declined as the field dried out (~300 mmol-O 3 m -2 s -1 to 12 ~70 mmol-O 3 m -2 s -1 ), the total ozone flux did not follow the same trend, indicating that 13 non-stomatal deposition was significant. Over a dry surface non-stomatal resistance (R ns ) 14 was 270-450 s m -1 , while over a wet surface R ns was ~50% smaller and both decreased 15 with increasing surface temperature and friction velocity. From the variation with relative 16 humidity (RH) it is suggested that three processes occur on leaf surfaces: on a very dry 17 surface ozone is removed by thermal decomposition, possibly enhanced by photolytic 18 reactions in the daytime and so R ns decreases as temperature increases; at 50-70% RH a 19 thin film of liquid blocks the "dry" process and resistance increases; above 60-70% RH 20 sufficient surface water is present for aqueous reactions to remove ozone and resistance 21 decreases. 22Keywords: eddy-correlation; surface conductance; ozone critical levels; AOT40, AFst6; 23 stomatal uptake; non-stomatal; dry deposition 24 Capsule: Ozone deposition to a potato crop depends not only on stomatal uptake but is 25 enhanced by increasing surface temperature or the presence of water. 26

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“…10 MJ•m -2 •d -1 is the equivalent of 230 W•m -2 or 530 µmol PAR m -2 •s -1 for 12 hours. With a light saturation point near 400 to 500 µmol PAR m -2 •s -1 (Gordon et al, 1997;Pleijel et al, 2002), the actual light intensity was larger than that most of the day, except during sunrise and sunset.…”

Section: Tuber Number As a Function Of Radiation And Precipitation In P1mentioning

confidence: 93%

Weather and crop dynamics in a complex terrain, the Gamo Highlands – Ethiopia : Towards a high-resolution and model-observation based approach

Minda

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List of publications Graduate School Certificate * Sustainable development is defined as development that meets the needs of the present without compromising the ability of future generations to meet their own needs (Kates et al., 2005). † Food security exists when all people, at all times, have physical, social and economic access to sufficient, safe and nutritious food to meet their dietary needs and food preferences for an active and healthy life (Devaux et al.,

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Stomatal resistance of three potato cultivars as influenced by soil water status, humidity and irradiance

Cited by 7 publications

References 23 publications

Responses of Canopy Growth and Yield of Potato Cultivars to Weather Dynamics in a Complex Topography: Belg Farming Seasons in the Gamo Highlands, Ethiopia

Responses of Canopy Growth and Yield of Potato Cultivars to Weather Dynamics in a Complex Topography: Belg Farming Seasons in the Gamo Highlands, Ethiopia

Measurements of ozone deposition to a potato canopy

Weather and crop dynamics in a complex terrain, the Gamo Highlands – Ethiopia : Towards a high-resolution and model-observation based approach

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