Letter Published: 03 October 1959 A Least-Squares Solution for a Linear Relation between Two Observed Quantities B. K. KELLY Nature 184, 1086 (1959) Cite this article ...

Results The relation between ψleaf and E was linear at all soil moistures. The slope of ψleaf (E) increased with decreasing soil moisture due to the decreasing soil-root conductance. The fact that the ...