Dear Prof
I tharshani lecturer attached to the department of Agricultural
biology having conducting research on Eco friendly management of Root
knote and cyst management. for that i need a clarification regarding
the Parthenium

1. How the allelopathic effect changes with the age of Parthenium
2. Which stage shows higest allelopathic effect (Seedling or flowering)
3. is the green manure have the same level of effect as
allelopathic effect?

Thanks
Wating fro your timely reply.
N.Tharshani
Lecturer
Faculty of Agriculture
University of Jaffna
Sri Lanka