Hello Benjamin,
  Effective irrigation is the amount of irrigation water that infiltrates the soil. Water may not infiltrate the soil due to runoff, evaporation, wind blowing the water out of the plot (in the case of sprinkler irrigation), etc. Irrigation efficiency is the ratio of amount of water that infiltrates the soil to the total amount applied.
  Hope this helps.
Sincerely,
Richard

----- Original Message -----
From: Benjamin Fehling <[log in to unmask]>
Date: Thursday, July 13, 2006 5:27 am
Subject: effective Irrigation
To: [log in to unmask]

> Dear all,
>
> in my SoilWatBal.out file effective Irrigation for some of my test
> fields differs significantly from the applied amount. All irrigation
> inputs are correct. The efficient fraction factor in X-build is
> set to
> 1. What is exactly meant by effective irrigation and what factors
> effect the amount of the uneffective fraction?
>
> Thanks a lot for your advice.
>
> Benjamin Fehling
> Institute for vegetation ecology
> Tuebingen/Germany
>