Relative evaluation of water stress indicators for soybeans

Sivakumar, M V K and Shaw, R H (1978) Relative evaluation of water stress indicators for soybeans. Agronomy Journal, 70 (4). pp. 619-623. ISSN 0002-1962

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Abstract

Field studies were conducted during 1976 on Ida silt loam to evaluate stomatal conductance, leaf-water potential and leaf area as water stress indicators for soyabeans. Stomatal conductance and leaf water potential were measured at 2-h intervals from 0600 to 2000 h. Stomatal resistance was measured with a diffusion porometer, with stomatal conductance taken as the reciprocal of leaf resistance. Leaf-water potential was measured using a pressure chamber. Leaf area was measured with an electronic leaf-area integrator. Daily means of stomatal conductance and leaf-water potential measured several times during the growing season and rate of leaf area expansion were closely related to changes in soil-water potential. RGR of soyabeans was negatively correlated with stomatal conductance, leaf-water potential and rate of leaf-area expansion. The 3 plant measurements should prove useful in explaining water-deficit effects quantitatively under field conditions

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Stomatal conductance, Leafwater potential, Leaf area, Soil-water potential, Relative growth rate.
Subjects:	Others
Depositing User:	Mr B K Murthy
Date Deposited:	06 Jul 2012 03:54
Last Modified:	06 Jul 2012 03:54
URI:	http://oar.icrisat.org/id/eprint/5988
Official URL:
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Author

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