Estimation of an effective soil water potential at the root surface of transpiring plants

Jones, Hamlyn G.

doi:10.1111/1365-3040.ep11589241

Cited by 58 publications

(34 citation statements)

References 20 publications

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“…This phenomenon is called hysteresis (Poulovassilis, 1962;Xu et al, 1994). Hysteresis occurs especially when no sufficient time is allowed for completion of the equilibrium at one PPF point (Jones, 1983a). Some authors suggest that photosynthetic hysteresis is caused by stomatal response (Warrit et al, 1980).…”

Section: Discussionmentioning

confidence: 99%

Effects of a Microbial Inoculant and Organic Fertilizers on the Growth, Photosynthesis and Yield of Sweet Corn

2001

Journal of Crop Production

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A microbial inoculant known as Effective Microorganisms or EM is a mixed culture of naturally-occurring, beneficial microorganisms (predominantly lactic acid bacteria, yeast, actinomycetes, photosynthetic bacteria and certain fungi) that has been used with considerable success to improve soil quality and the growth and yield of crops, particularly in nature farming and organic farming systems. Despite this success, the exact mechanisms of how this EM elicits such beneficial effects is largely unknown. Consequently, a study was conducted to determine the effects of EM and organic fertilizer on the growth, photosynthesis, and yield of sweet corn (Zea mays L.) under glasshouse conditions, compared with chemical fertilizer. An organic fertilizer consisting of a mixture of oilseed mill sludge, rice husk and bran, and fish processing waste, was inoculated and fermented with EM as the microbial inoculant. The organic fertilizer and chemical fertilizer were then applied to respective pots to compare the growth, yield and physiological response of sweet corn plants. EM applied with the organic fertilizer was shown to promote root growth and activity, and to enhance photosynthetic efficiency and capacity, which resulted in in-Hui-lian Xu is Senior Crop Scientist,

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Section: Discussionmentioning

confidence: 99%

Effects of a Microbial Inoculant and Organic Fertilizers on the Growth, Photosynthesis and Yield of Sweet Corn

2001

Journal of Crop Production

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“…Plant transpiration (E p ) depends on the difference between the "effective" soil water potential at the root surface (Ψ s ) and the "effective" leaf water potential for the whole canopy (Ψ l ), and on the soil-plant hydraulic resistance (R p ), as shown in Equation (1) [25]:…”

Section: Daily Growth Dg µMmentioning

confidence: 99%

Plant-Based Methods for Irrigation Scheduling of Woody Crops

Fernández

2017

Horticulturae

139

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Abstract:The increasing world population and expected climate scenarios impel the agricultural sector towards a more efficient use of water. The scientific community is responding to that challenge by developing a variety of methods and technologies to increase crop water productivity. Precision irrigation is intended to achieve that purpose, through the wise choice of the irrigation system, the irrigation strategy, the method to schedule irrigation, and the production target. In this review, the relevance of precision irrigation for a rational use of water in agriculture, and methods related to the use of plant-based measurements for both the assessment of plant water stress and irrigation scheduling, are considered. These include non-automated, conventional methods based on manual records of plant water status and gas exchange, and automated methods where the related variable is recorded continuously and automatically. Thus, the use of methodologies based on the Scholander chamber and portable gas analysers, as well as those of systems for measuring sap flow, stem diameter variation and leaf turgor pressure, are reviewed. Other methods less used but with a potential to improve irrigation are also considered. These include those based on measurements related to the stem and leaf water content, and to changes in electrical potential within the plant. The use of measurements related to canopy temperature, both for direct assessment of water stress and for defining zones with different irrigation requirements, is also addressed. Finally, the importance of choosing the production target wisely, and the need for economic analyses to obtain maximum benefit of the technology related to precision irrigation, are outlined.

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“…The K p values were determined as K p = E p ( s - l ) -1 , being E p measured at the central hours of the day, when transpiration rates were relatively constant;  s (MPa) is the 'effective' soil water potential at the root surface and  l (MPa) is the 'effective' leaf water potential for the whole canopy (Jones, 1983). Both s and  l were determined at the same hours than E p .…”

Section: Determining the Tree Hydraulic Conductancementioning

confidence: 99%

Seasonal Changes of Hydraulic Conductance of Mature Olive Trees Under Different Water Regimes

Fernández¹,

Diaz-Espejo²,

Torres-Ruiz³

et al. 2009

Acta Hortic.

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The well know stomata control of olive trees under stressing conditions proved to be an efficient mechanism to prevent the loss of hydraulic efficiency during the dry season. Trees with a localized irrigation system that replaced 100% of the crop water demand (FAO trees), as well as Dryfarming trees, were able to keep similar differences between the water potential in the soil and that in the leaves, all throughout the dry season. The differences were of the same order than those in trees with non-limiting soil water conditions in the whole rootzone (Pond trees). As a consequence of stomatal closure, the tree transpiration late in the season was reduced in the FAO trees, but the hydraulic conductance remained unaffected. Results suggest that a root-to-shoot signalling mechanism could have been responsible for stomata control in the FAO trees. At the end of the dry season, values of hydraulic conductance were lower in Dryfarming than in the irrigated treatments, but, once again, the recorded leaf water potential values, when compared to vulnerability curves, suggest that the low hydraulic conductance in those trees was mainly due to a reduced tree transpiration caused by stomatal closure, rather than to a severe loss of the hydraulic efficiency.

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Estimation of an effective soil water potential at the root surface of transpiring plants

Cited by 58 publications

References 20 publications

Effects of a Microbial Inoculant and Organic Fertilizers on the Growth, Photosynthesis and Yield of Sweet Corn

Effects of a Microbial Inoculant and Organic Fertilizers on the Growth, Photosynthesis and Yield of Sweet Corn

Plant-Based Methods for Irrigation Scheduling of Woody Crops

Seasonal Changes of Hydraulic Conductance of Mature Olive Trees Under Different Water Regimes

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