A Field Study of Plant Resistance to Water Flow in Alfalfa<sup>1</sup>

Abduljabbar, Adel S.; Lugg, D. G.; Sammis, T. W.; Gay, Lloyd W.

doi:10.2134/agronj1984.00021962007600050014x

Cited by 22 publications

(3 citation statements)

References 18 publications

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“…The degree of the differentiation and the overall time course of Ψ l was also affected by the environmental conditions prevailed during each observation period. Both drought‐stressed lucerne and clover plants exhibit a decrease in their Ψ l ‐ values similar to those observed in the present work (Sharratt et al 1983, Abdul‐Jabbar et al 1984, Hutmacher et al 1991, Oliva et al 1994a,b).…”

Section: Discussionsupporting

confidence: 89%

“…The degree of the differentiation and the overall time course of W l was also affected by the environmental conditions prevailed during each observation period. Both drought-stressed lucerne and clover plants exhibit a decrease in their W l -values similar to those observed in the present work (Sharratt et al 1983, Abdul-Jabbar et al 1984, Hutmacher et al 1991, Oliva et al 1994a. A strong positive relationship between leaf area and dry matter growth on one hand and leaf water status on the other hand was observed in lucerne, as in many other legumes (Karamanos 1984, 1986, Mwanamwenge et al 1999, Palta and Plaut 1999, Shrestha et al 2006.…”

Section: Discussionsupporting

confidence: 87%

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Effects of Water Shortage and Air Temperature on Seed Yield and Seed Performance of Lucerne (Medicago sativa L.) in a Mediterranean Environment

Karamanos

Papastylianou

Stavrou

et al. 2009

J Agronomy Crop Science

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Seed production and performance of lucerne is characterized by fluctuating yields with often poor seed quality, and is dependent on environmental conditions, genetic characteristics and agronomic techniques applied during seed set, development, maturation and storage. A field experiment was carried out in two successive growing seasons at Kopais (southern Greece) to evaluate the effects of drought stress imposed by three irrigation treatments, and temperature during flowering and seed filling on lucerne seed yield and quality. Plant water status, expressed in terms of the water potential index (WPI), growth in leaf area and dry weight, seed yield and yield components, flowering and seed quality parameters were measured throughout the growing seasons. The adopted irrigation schemes produced a clear differentiation among treatments concerning their plant water status. Seed yield and leaf growth showed close positive correlations with WPI. An irrigation effect was also detected for the number of pods/plant, but not for the average weight of seeds/pod. Less negative values of WPI, and, especially, higher temperatures during flowering were also positively associated with a longer duration of flowering, as well as with higher total numbers of inflorescences. A very good description of the time course of seed germination was performed by fitting the Richards’ function to the real data. By examining the germination parameters derived from this function it was found that final germination and germination rate were improved, while germination duration was shortened with more negative values of WPI. The effects of growing season and seeding period were occasionally equally or more important than irrigation effects. These results are also discussed in terms of their practical implications for seed producing lucerne crops.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionsupporting

confidence: 87%

Effects of Water Shortage and Air Temperature on Seed Yield and Seed Performance of Lucerne (Medicago sativa L.) in a Mediterranean Environment

Karamanos

Papastylianou

Stavrou

et al. 2009

J Agronomy Crop Science

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“…[1] uses the difference in water potential between the soil adjacent to the root (usually taken as 1 cm) and some point across the root membrane, pairing this gradient with the soil hydraulic conductivity. Abdul‐Jabbar et al (1983) found that the greatest resistance to flow changes from the root membrane to the soil at some critical water content which would be a function of soil and plant properties. To be correctly parameterized across the range of water contents that would be encountered under conditions of water stress such as deficit irrigation, Eq.…”

Section: Theorymentioning

confidence: 99%

Modeling Plant Response to Drought and Salt Stress: Reformulation of the Root‐Sink Term

Dudley

Shani²

2003

Vadose Zone Journal

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Because transpiration is often the largest component of the water budget in arid systems, the efficacy of computer simulation models as predictors of water and salt movement is predicated on their ability to predict transpiration. The objective of this study was to improve the root‐sink term for water extraction and thus improve predictions of transpiration. The root‐sink terms often use either a transpiration‐apportioning (TA) empirical function for the plant response to the soil matric and osmotic potential or a potential‐flow (PF) function. Three root‐sink terms, a TA formulation, a PF formulation, and a combination of the two (PFTA, a TA function for computing water uptake in response to salinity and a PF function for computing water uptake in response to water availability) were coded into a simulation model, and model predictions were compared with field‐collected data. When predicted and measured relative yields (yield/yieldmax) were compared, the PF produced the poorest agreement with data (y = 0.8741x + 0.0251), the TA gave better agreement (y = 0.9283x + 0.0476), and PFTA provided the best agreement (y = 0.9909x + 0.0430). The plant and plant–soil based formulation predicted the salinity profile at the end of the field experiment under conditions of high salinity (EC irrigation water = 6.0 dS m−1) and irrigation equal to potential evaporation. The plant–soil formulation was the better predictor under the same salinity condition with irrigation at 40% of potential evaporation. The simulated evolution of the water content and salinity profile across time was also examined.

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Plant water status, hydraulic resistance and capacitance

Koide¹,

Robichaux²,

Morse³

et al. 1989

Plant Physiological Ecology

155

108

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A Field Study of Plant Resistance to Water Flow in Alfalfa¹

Cited by 22 publications

References 18 publications

Effects of Water Shortage and Air Temperature on Seed Yield and Seed Performance of Lucerne (Medicago sativa L.) in a Mediterranean Environment

Effects of Water Shortage and Air Temperature on Seed Yield and Seed Performance of Lucerne (Medicago sativa L.) in a Mediterranean Environment

Modeling Plant Response to Drought and Salt Stress: Reformulation of the Root‐Sink Term

Plant water status, hydraulic resistance and capacitance

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A Field Study of Plant Resistance to Water Flow in Alfalfa1

Cited by 22 publications

References 18 publications

Effects of Water Shortage and Air Temperature on Seed Yield and Seed Performance of Lucerne (Medicago sativa L.) in a Mediterranean Environment

Effects of Water Shortage and Air Temperature on Seed Yield and Seed Performance of Lucerne (Medicago sativa L.) in a Mediterranean Environment

Modeling Plant Response to Drought and Salt Stress: Reformulation of the Root‐Sink Term

Plant water status, hydraulic resistance and capacitance

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Product

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A Field Study of Plant Resistance to Water Flow in Alfalfa¹