To best of my knowledge the DSSAT does not simulate controlled water table depth.  But ask Dr. Hoogenboom who is a co-author of the mentioned paper?



When you select 60 cm under automatic irrigation, that means the model irrigates when top 60 cm of soil reaches some percentage available soil water threshold, say 50%.



I don't think the output statement of water table depth of 100 cm means anything, if you only have a soil 100 cm deep.



Good luck

Ken Boote



-----Original Message-----

From: DSSAT - Crop Models and Applications [mailto:[log in to unmask]] On Behalf Of Ajay Singh

Sent: Monday, July 14, 2014 11:41 AM

To: [log in to unmask]

Subject: simulate subsurface irrigation



Hi All!



In the experiment, we maintained the water table depth at 60 cm for control-drainage with subirrigation. We want to simulate control-drainage with subirrigation using the DSSAT model. We referred the paper Liu et al.

(2011). We used the following steps under “simulation” option”





1. Set the irrigation management  to “automatic “



2. Set the management depth to “60 cm”



3. Irrigation method as “water table depth”





But the model shows water table depth at 100 cm. But the actual water table depth was 60 cm. The tile drain is installed at 100 cm depth. We are irrigating by pumping water through this tile drain.



The soil profile depth is 100 cm.





Can you suggest how to rectify the problem?







Thanks,







Ajay Singh



Reference:



Liu, H. L., Yang, J. Y., Tan, C. S., Drury, C. F., Reynolds, W. D., Zhang, T. Q., Bai, Y. L., Jin, J., He, P., and Hoogenboom, G. (2011). "Simulating water content, crop yield and nitrate-N loss under free and controlled tile drainage with subsurface irrigation using the DSSAT model." *Agricultural Water Management*, 98(6), 1105-1111.