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Use of a Hydraulic Press for Estimation of Leaf Water Potential in Grain Sorghum 1
Author(s) -
Hicks S. K.,
Lascano R. J.,
Wendt C. W.,
Onken A. B.
Publication year - 1986
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1986.00021962007800040038x
Subject(s) - sorghum , sorghum bicolor , agronomy , sweet sorghum , hydraulic press , environmental science , water use , horticulture , biology , chemistry , physics , thermodynamics
The hydraulic press (HP) is a highly portable instrument designed for rapid measurement of leaf water potential of plants. This study compared grain sorghum [ Sorghum bicolor (L.) Moench] leaf water potentials measured with a pressure chamber (PC) and using two endpoints with a HP, under glasshouse conditions. The first endpoint is when water exudes from one vein and the second endpoint when water exudes from all veins on both sides of the leaf tissue. The results showed that the HP and PC measurements agreed well in the range of −0.5 to −3.5 MPa of leaf water potentials when the second endpoint was selected for the HP. The HP can be used to measure the leaf water potential of grain sorghum, provided it is calibrated using the second endpoint against a PC or another method.