Hello Ines:

You can look this one also, incase you can not get hold of the references
given to you already by Mr Kakani.

Ritchie, J.T. 1985. A user oriented model of soil water balance in wheat.
p.293-305. In: W.Day and R.K. Atkins. (ed.) Wheat growth and
modelling.Plenum Press, NY.

   Alagarswamy
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