APTI = {[A(T+P)]+R}/10 , where A-ascorbic acid mg/g T- total chlorophyll mg/g, P-pH of the leaf extract and R - relative water content in pecentage.
as the units are different from each other biochemical parameter as it can be identified from the formulae, so would like to know what is the assumptions or justification has been made.
Guido Bongi
Singh and Rao dvelopped this index in the late 80s. The units are mixed and do not have physical meaning, but the reasoning is joning positive factors into one value that may range from 4 to 40 with acid smog. Euristically it copes with resistance in Indian flora, but the units are not Standard ((mgDw-1)^2,log(1/H)in Fw, %RWC..)It is advisable to give a table with single variables and use fumigation controls.
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