Hi,
The message below I sent this morning, but the DSSAT list server does not accept attachments, so it bounced back. Please give me your personal email address.
Arjan
-----Original Message-----
From: Gijsman, Arjan J. (CIAT)
Sent: Tuesday, August 29, 2006 6:09 AM
To: 'DSSAT - Crop Models and Applications'
Subject: RE: Re: denitrification
Dear Jin Wu,
As version 4.0 is rather new, there hasn't been published a whole lot of information about it. In the attachment I send you a very informative article about it from the initial months after its release.
Good luck!
Arjan
-----Original Message-----
From: DSSAT - Crop Models and Applications [mailto:[log in to unmask]]On Behalf Of Jin Zhong Wu
Sent: Monday, August 28, 2006 7:47 PM
To: [log in to unmask]
Subject: Re: denitrification
Dear Arjan Gijsman:
Thanks for your prompt reply.
The paper in the book "Understanding options for agricultural production"
using same equation as v3.5.
Will you tell me where may I get the info for version 4.0?
Jin Wu
----- Original Message -----
From: "Gijsman, Arjan J. (CIAT)" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, August 28, 2006 7:42 PM
Subject: Re: the definition of NO3(L)
> Hi Jin Wu,
>
>
> It looks like you are referring to the code of v3.5, since in v4.0 it
> changed a little. Those meaningless variable names FT and FW were replaced
> by variables that mean something: TFDENIT and WFDENIT, since there are so
> many temperature and water factors.
>
> Much of the DNRATE equation seems to come from Godwin and Singh, which I
> assume is: Godwin, D.C., and U. Singh. 1998. Nitrogen balance and crop
> response to nitrogen in upland and lowland cropping systems. p. 55-77. In
> G.Y. Tsuji , G. Hoogenboom, and P.K. Thornton (eds.) Understanding options
> for agricultural production. System approaches for sustainable
> agricultural development. Kluwer Academic Publishers, Dordrecht,
> Netherlands.
>
> Cheers,
> Arjan Gijsman
>
>
>
> -----Original Message-----
> From: DSSAT - Crop Models and Applications
> [mailto:[log in to unmask]]On Behalf Of Jin Zhong Wu
> Sent: Sunday, August 27, 2006 9:42 PM
> To: [log in to unmask]
> Subject: Re: the definition of NO3(L)
>
> Dear M.E. Asadi:
>
> Thanks for your info.
>
> I have more question:
>
> CERES has an denitrification equation
> DNRATE = 6.0*1.0E-05*CW*NO3(L)*FW*FT*DLAYR(L)
>
> Where DNRATE is in kg [N} / ha. As you told me: NO3(L) is in ug [N]/g
> [soil])
>
> My question is that:
> if the bulk density and unit conversion are included by the 6.0*1.0E-05?
> What is the reference paper to derive the 6.0*1.0E-05?
>
> Jin Wu
>
> ----- Original Message -----
> From: "Dr. mohammad asadi" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, August 25, 2006 3:28 AM
> Subject: Re: the definition of NO3(L)
>
>
>> Dear Jin Wu,
>>
>>
>> Hello. Be informed that the definition of NO3(L) and NH4 (L) which is
>> soil nitrate (ppm or ug /g soil) and ammonium respectively in layer L
>> refer to per unit weight of soil (g-1 soil) and NO3(L) is soil
>> concentration.
>>
>>
>> Best regards,
>>
>> M.E. Asadi
>>
>>
>>
>>
>> M. E. Asadi,Ph.D, Research Scientist
>> Tel: 0098-171-3354868 (office)
>> Mobile phone: 0098-0911-175-2719
>> Fax: 0098-171-3359813
>> Mailing Address:
>> Mr. Asadi, Mail Box 49175-639, Gorgan, Iran
>>
>>
>>
>> ---------------------------------
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>>
>
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