Paul:
Two comments/questions:
Piara was doing this and yes you get the fixed depth outputs, but he had a
tough time calibrating the soil file input values for DUL and LL, since the
DSSAT program does its work with the standard depths, thus, tearing apart
anything that you may have put in the soils file. Any comments on this.
Secondly, Why does this file come to me with strange places for carriage
returns from you, but not from Marta. I use Eudora Light.
Ken
At 01:41 PM 3/21/00 +0000, you wrote:
>Hello, Marta
>
>As excerpted from Volume 4, Chapter 1 of the DSSAT manuals,
>
>SPECIFYING OBSERVED SOIL LAYER DATA FOR WINGRAF
>
>The capability to graph simulated data using the same soil layers as those
>used for
>observed data was not documented in the WINGRAF chapter of DSSAT v3 (Chan et
>al., 1994). The following is a description of the naming convention to be
>used for
>headers when setting up a file for measured time series data FILET. The
>first letter of
>the header specifies the variable measured. W is used for soil water
>content, T is soil
>temperature, N is soil nitrate and A is soil ammonium. The second space is
>reserved
>for values that specify the layer number in ascending order from the
>surface. A maxi-
>mum of 15 layers can be defined, using the hexadecimal numbering system. The
>surface layer should be given a value of 1, the ninth layer should be given
>a value of 9,
>the tenth layer a value of A, etc. The third and fourth spaces together
>specify the
>thickness of the layer in centimeter. Below are several examples for all
>four variables.
>
>VARIABLE HEADER EXAMPLE EXPLANATION
>Soil Water (W) W110 Surface layer, 10 cm thick
>Soil Water (W) WA30 Tenth layer, 30 cm thick
>Soil Water (W) WF25 Fifteenth layer, 25 cm thick
>Soil Temperature (T) T220 Second layer, 20 cm thick
>Soil Nitrate (N) N515 Fifth layer, 15 cm thick
>Soil Ammonium (A) A115 Surface layer, 15 cm thick
>
>When observed data are input using this naming convention for headers,
>WINGRAF
>will display the variable name preceded by an infinity symbol. The standard
>soil
>layers will also be displayed. To provide an appropriate comparison of
>simulated and
>observed data, WINGRAF recalculates the simulated output values provided by
>the
>model, which are for the standard soil layers, and graphs the resultant new
>values for
>the same soil layer as the observed data.
>
>As an example, if you have measured soil water by depth at say 10,20,30, and
>40 cm you can put the data in your PNT file similar to this example ..
>
>@TRNO DATE W110 W210 W310 W410
>
> 1 86316 0.27 0.29 0.27 0.29
> 1 86328 0.23 0.28 0.24 0.28
> 1 86342 0.34 0.35 0.27 0.27
>
>This shows layer 1 = 10 cm, 2 = 10 cm, and so on. Wingraf will then add
>these depths to the graph menu (for water in this case) so that you directly
>compare measured variables at the depth you measured them against model
>output.
>
>Hope this helps.
>
>Cheers,
>
>PW
>
>Paul Wilkens
>International Fertilizer Development Center
>P.O. Box 2040
>Muscle Shoals, Alabama 35630
>
>(256) 381-6600 (Tel)
>(256) 381-7408 (Fax)
>
>[log in to unmask]
>http://www.ifdc.org/
>
>
>
>-----Original Message-----
>From: Marta Graciela Vinocur [mailto:[log in to unmask]]
>Sent: Monday, March 20, 2000 7:37 PM
>To: [log in to unmask]
>Subject: Question about .pnt files
>
>
>Dear subscribers,
>
>I have a question about how to do .PNT file which consider my own depth for
>each soil layer and not the one that DSSAT provided. I measured soil water
>content along the crop cycle considering the depth of each layer. When I
>tried to do the .Pnt file with the measured values, I realized that the
>depth considered for SW1D, SW2D, etc. are differents from my own depth. Is
>there any way to solve this problem?
>Thanking you in advance for your time and help, please receive my kindly
>regards.
>Sincerely
>
>Marta Vinocur
>Ing. Agr. M.Sc. Marta G. Vinocur
>Facultad de Agronomía y Veterinaria
>Universidad Nacional de Río Cuarto
>Ruta Nac. 36 Km 601
>X5804 BYA Río Cuarto, Córdoba
>Argentina
>Phone: 54 358 4676191
>Fax: 54 358 4680280
|
