Patterns of stem water potential in field grown potatoes using stem psychrometers

Coffey, W. L. P.; Dixon, Michael

doi:10.1007/bf02407560

Cited by 6 publications

(7 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The overall trend in RT based on the AWD is similar to that observed for corn (Ritchie 1973;Muchow and Sinclair 1991), sorghum and cotton (Rosenthal et al 1987). Studying the same three cultivars, Coffey et al (1997), found little variation in the dirunal pattern of stem water potential under well-watered conditions. However, with increasing AWD, differences were observed.…”

Section: Sap Flow As Affected By Soil Water Solar Radiation and Humisupporting

confidence: 70%

“…Irrigation water was applied generally twice weekly to maintain root zone soil water within 25% of the upper limit of available water. Manual rain shelters were constructed to provide protection from selected rainfall events for the sheltered plots (Coffey et al 1997). Prior to forecasted rain, polyethelene covers were placed over wooden stakes to divert rainfall from the canopy to trenches that directed rain water away from the plots.…”

mentioning

confidence: 99%

See 1 more Smart Citation

An assessment of potato sap flow as affected by soil water status, solar radiation and vapour pressure deficit

Brown¹,

Madani²,

Dixon³

1999

Can. J. Soil. Sci.

Self Cite

View full text Add to dashboard Cite

. 1999. An assessment of potato sap flow as affected by soil water status, solar radiation and vapour pressure deficit. Can. J. Soil Sci. 79: 245-253. Water-use of three field-grown potato cultivars (Atlantic, Monona and Norchip) was examined using a commercially available sap flow monitoring system over three consecutive growing seasons. The objectives of the investigation were to utilize the sap flow system to assess the water use of three fieldgrown potato cultivars. This included an assessment of the relationship between environmental conditions, water status and measured sap flow including the plant-to-plant variation in sap flow and an evaluation of relative transpiration in relation to the soil water status.Each cultivar maintained daily sap flow close to the atmospheric potential transpiration until approximately 70% of the available water was depleted. Under conditions where the soil was drier (> 70% depleted), Monona potato plants exhibited a more rapid decline in transpiration than Norchip and Atlantic.Hourly sap flow rates were closely related to solar irradiance, especially under well-watered conditions, with no apparent light saturation point. Vapour pressure deficit effects on sap flow were less pronounced, although maximum vapour pressure deficits encountered were only 2 kPa. The lack of drought tolerance of the potato (Solanum tuberosum L.) crop has been well documented (van Loon 1981). Specific physiological factors such as leaf expansion, cell enlargement, the conversion of intercepted radiation into dry matter and enzymatic activities have all been shown to be affected by soil water MacKerron 1987, 1989). Even under well-watered conditions midday stress response has been observed ( Van der Zaag and Burton 1978). A need exists for accurate irrigation scheduling strategies through assessments of the water relations of potatoes to improve their yield potential, even in regions with abundant rainfall.It is recognized that both photosynthesis (P) and transpiration (T) of well-fertilized crops are proportional to intercepted solar radiation below saturation thresholds when soil water (θ) is non-limiting (Monteith 1966). At low levels of θ, both P and T can be reduced due to an increase in stomatal resistance (r s ) (Campbell et al. 1976). For example, the major factor reducing P during periods of water stress is a decreased availability of CO 2 imposed through an increase in r s . Zelitch (1971) points out that the resistance to water vapour transfer imposed by the stomata, is less than the simultaneous resistance of CO 2 into the mesophyll cells. Thus an increase in r s may conceivably result in a greater relative reduction in T than P. Therefore measurements of T may be a more sensitive indicator of the onset of water stress than measurements of P.In considering the relationship between T and P, Bierhuizen and Slatyer (1965)

show abstract

Section: Sap Flow As Affected By Soil Water Solar Radiation and Humisupporting

confidence: 70%

mentioning

confidence: 99%

An assessment of potato sap flow as affected by soil water status, solar radiation and vapour pressure deficit

Brown¹,

Madani²,

Dixon³

1999

Can. J. Soil. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The results indicate for Atlantic an AWD s value of approximately 30% compared to 16% for Norchip and 4% for Monona. Coffey et al (1997) found stem water potentials for the same cultivars to have similar differences in their response to soil water. In studying the cultivar Maris Piper, Jefferies (1989) indicated that the leaf extension rate was reduced when 13% of the root zone available water was depleted.…”

Section: Resultsmentioning

confidence: 64%

“…Jefferies (1989) estimated this value to be -1.1 MPa. This difference could be due to cultivar response to soil water status as found by Coffey et al (1997) under identical environmental and soil physical conditions. These variations among cultivars also extend to leaf expansion (Jefferies, 1993b).…”

Section: Introductionmentioning

confidence: 87%

“…During the 1992 growing season, irrigation water was applied at two day intervals from crop emergence through to the maximum LAI to maintain the soil water status near the upper limit of available water. For the stressed plots, manual rain shelters were constructed and placed over the plots overnight during selected rainfall events throughout the growing season (Coffey et al, 1997). Trenches were dug to direct rain water away from the plots.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Estimating potato leaf area index for specific cultivars

Brown

Dixon

1997

Potato Res

Self Cite

View full text Add to dashboard Cite

SummaryThe growth and duration of crop leaf area determines the amount of solar radiation intercepted by the canopy and therefore influences the extent of photosynthesis, evaporation, transpiration and final dry matter yield. The objective of this study was to develop cultivar specific relationships to estimate the daily leaf area index (LAI) for the potato crop (Solanum tuberosum L.) that included the effects of available soil water. The model is divided into three LAI growth stages, the durations of which are partially related to potato heat units (PJ-IU). The LAI in the first stage is estimated from a cultivar specific leaf area-based radiation use efficiency index with a soil water reduction factor. The second stage involves the maintenance of a constant LAI with the duration related to both PHU and a soil water index that can accelerate senescence. The final stage includes a decrease in the LAI from a maximum to zero in response to a cultivar specific PHU accumulation.Model simulations compared favourably with independent LAI measurements obtained with a LI-COR plant canopy analyzer over two seasons.

show abstract

Tuber Water and Pressure Potentials Decrease and Sucrose Contents Increase in Response to Moderate Drought and Heat Stress

2009

View full text Add to dashboard Cite

Environmental stress during the growing season can reduce the quality of stored Solanum tuberosum (potato) tubers. Changes in greenhouse grown Russet Burbank tuber water potential and tuber composition following periods of moderate drought, heat, or drought and heat stress were characterized. Decreased leaf and tuber water potentials were observed at the end of stress treatments. Decreased tuber water potential caused dramatic declines in tuber pressure potential. Tuber sucrose content increased with the severity of stress. Changes in tuber glucose and malic acid contents were also observed. Stress during early tuber bulking had a larger effect on tuber sugars at the end of the stress period than stress during late bulking. Stem-end glucose concentration of tubers at harvest after vine senescence was greater in tubers from plants stressed at early tuber bulking compared to late bulking.Resumen El agobio ambiental durante el ciclo de cultivo puede reducir la calidad de tubérculos de Solanum tuberosum (papa) almacenados. Se caracterizaron cambios en el potencial hídrico del tubérculo y su composición en Russet Burbank cultivada en invernadero, después de períodos de sequía moderada, calor, o sequía y agobio por calor. Se observó disminución en el potencial hídrico de la hoja y del tubérculo al final de los tratamientos de agobio. La disminución del potencial hídrico del tubérculo causó dramática disminución en el potencial de presión del tubérculo. Aumentó el contenido de sacarosa en el tubér-culo con la severidad del agobio. También se observaron cambios en los contenidos de glucosa y ácido málico del tubérculo. El agobio al inicio de la tuberización tuvo un efecto mayor en azúcares del tubérculo al final del período de agobio que el agobio al final de la tuberización. La concentración de la glucosa en la base de los tubérculos a la cosecha, después de la senectud del follaje, fue mayor en tubérculos de plantas agobiadas al inicio de la tuberización comparada con agobio al final.

show abstract

Patterns of stem water potential in field grown potatoes using stem psychrometers

Cited by 6 publications

References 22 publications

An assessment of potato sap flow as affected by soil water status, solar radiation and vapour pressure deficit

An assessment of potato sap flow as affected by soil water status, solar radiation and vapour pressure deficit

Estimating potato leaf area index for specific cultivars

Tuber Water and Pressure Potentials Decrease and Sucrose Contents Increase in Response to Moderate Drought and Heat Stress

Contact Info

Product

Resources

About