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Evaluating responses of maize (Zea mays L.) to soil physical conditions using a boundary line approach

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Title: Evaluating responses of maize (Zea mays L.) to soil physical conditions using a boundary line approach
Authors: Imhoff, S.1 simhoff@fca.unl.edu.ar, Kay, B.D.2, da Silva, A. Pires3, Hajabbasi, M.A.4
Source: Soil & Tillage Research. Jan2010, Vol. 106 Issue 2, p303-310. 8p.
Subjects: Corn varieties, Soil structure, Root growth, Soil matric potential, Plant-soil relationships, Soil compaction, Plant physiology, Multivariate analysis
Abstract: Abstract: The functional relation between the decline in the rate of a physiological process and the magnitude of a stress related to soil physical conditions is an important tool for uses as diverse as assessment of the stress-related sensitivity of different plant cultivars and characterization of soil structure. Two of the most pervasive sources of stress are soil resistance to root penetration (SR) and matric potential (ψ). However, the assessment of these sources of stress on physiological processes in different soils can be complicated by other sources of stress and by the strong relation between SR and ψ in a soil. A multivariate boundary line approach was assessed as a means of reducing these complications. The effects of SR and ψ stress conditions on plant responses were examined under growth chamber conditions. Maize plants (Zea mays L.) were grown in soils at different water contents and having different structures arising from variation in texture, organic carbon content and soil compaction. Measurements of carbon exchange (CE), leaf transpiration (LT), plant transpiration (PT), leaf area (LA), leaf+shoot dry weight (LSDW), root total length (RTL), root surface area (RSA) and root dry weight (RDW) were determined after plants reached the 12-leaf stage. The LT, PT and LA were described as a function of SR and ψ with a double S-shaped function using the multivariate boundary line approach. The CE and LSDW were described by the combination of an S-shaped function for SR and a linear function for ψ. The root parameters were described by a single S-shaped function for SR. The sensitivity to SR and ψ depended on the plant parameter. Values of PT, LA and LSDW were most sensitive to SR. Among those parameters exhibiting a significant response to ψ, PT was most sensitive. The boundary line approach was found to be a useful tool to describe the functional relation between the decline in the rate of a physiological process and the magnitude of a stress related to soil physical conditions. [Copyright &y& Elsevier]
Copyright of Soil & Tillage Research is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Evaluating responses of maize (Zea mays L.) to soil physical conditions using a boundary line approach
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  Data: <searchLink fieldCode="AR" term="%22Imhoff%2C+S%2E%22">Imhoff, S.</searchLink><relatesTo>1</relatesTo><i> simhoff@fca.unl.edu.ar</i><br /><searchLink fieldCode="AR" term="%22Kay%2C+B%2ED%2E%22">Kay, B.D.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22da+Silva%2C+A%2E+Pires%22">da Silva, A. Pires</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Hajabbasi%2C+M%2EA%2E%22">Hajabbasi, M.A.</searchLink><relatesTo>4</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Soil+%26+Tillage+Research%22">Soil & Tillage Research</searchLink>. Jan2010, Vol. 106 Issue 2, p303-310. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Corn+varieties%22">Corn varieties</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+structure%22">Soil structure</searchLink><br /><searchLink fieldCode="DE" term="%22Root+growth%22">Root growth</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+matric+potential%22">Soil matric potential</searchLink><br /><searchLink fieldCode="DE" term="%22Plant-soil+relationships%22">Plant-soil relationships</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+compaction%22">Soil compaction</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+physiology%22">Plant physiology</searchLink><br /><searchLink fieldCode="DE" term="%22Multivariate+analysis%22">Multivariate analysis</searchLink>
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  Data: Abstract: The functional relation between the decline in the rate of a physiological process and the magnitude of a stress related to soil physical conditions is an important tool for uses as diverse as assessment of the stress-related sensitivity of different plant cultivars and characterization of soil structure. Two of the most pervasive sources of stress are soil resistance to root penetration (SR) and matric potential (ψ). However, the assessment of these sources of stress on physiological processes in different soils can be complicated by other sources of stress and by the strong relation between SR and ψ in a soil. A multivariate boundary line approach was assessed as a means of reducing these complications. The effects of SR and ψ stress conditions on plant responses were examined under growth chamber conditions. Maize plants (Zea mays L.) were grown in soils at different water contents and having different structures arising from variation in texture, organic carbon content and soil compaction. Measurements of carbon exchange (CE), leaf transpiration (LT), plant transpiration (PT), leaf area (LA), leaf+shoot dry weight (LSDW), root total length (RTL), root surface area (RSA) and root dry weight (RDW) were determined after plants reached the 12-leaf stage. The LT, PT and LA were described as a function of SR and ψ with a double S-shaped function using the multivariate boundary line approach. The CE and LSDW were described by the combination of an S-shaped function for SR and a linear function for ψ. The root parameters were described by a single S-shaped function for SR. The sensitivity to SR and ψ depended on the plant parameter. Values of PT, LA and LSDW were most sensitive to SR. Among those parameters exhibiting a significant response to ψ, PT was most sensitive. The boundary line approach was found to be a useful tool to describe the functional relation between the decline in the rate of a physiological process and the magnitude of a stress related to soil physical conditions. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Soil & Tillage Research is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.still.2009.11.007
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        Text: English
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      – SubjectFull: Corn varieties
        Type: general
      – SubjectFull: Soil structure
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      – SubjectFull: Root growth
        Type: general
      – SubjectFull: Soil matric potential
        Type: general
      – SubjectFull: Plant-soil relationships
        Type: general
      – SubjectFull: Soil compaction
        Type: general
      – SubjectFull: Plant physiology
        Type: general
      – SubjectFull: Multivariate analysis
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      – TitleFull: Evaluating responses of maize (Zea mays L.) to soil physical conditions using a boundary line approach
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            NameFull: da Silva, A. Pires
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              Text: Jan2010
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