Dear Dr Subash:

Your problem of dealing with the daily data of climatic variables in any particular period of crop growth can be achieved through the Environmental Modification part of the FILEX that you would create to simulate your experiment. In that section you can modify all the weather variables for any crop stage and proceed with your simulations.

Hopefully this would answer your question.

Alagarswamy

----Original Message Follows----

From: Robin Matthews <[log in to unmask]>

Reply-To: DSSAT - Crop Models and Applications <[log in to unmask]>

To: [log in to unmask]

Subject: Re: Regarding climate change simulation on yield estimation

Date: Wed, 2 Apr 2003 00:46:24 +0100

Dear Nataraj subash

In a study we did with rice using the ORYZA model (Matthews, R. B. et al.

(1995). Modeling the Impact of Climate Change on Rice Production in Asia.

Wallingford, UK, IRRI/CAB International), the GCM scenarios gave predicted

monthly changes in solar radiation, temperature and rainfall due to climate

change, which were then used to modify current daily weather data files for

the particular site. In that case all the days in a specific month were

changed by the monthly value, but it would be possible to use some kind of

smoothing routine also.

It is not really a difficult problem - all you have to do is to prepare new

weather data files based on current weather data files, but with changes at

which ever timestep you have data for.

Robin Matthews.

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

From: Nataraj subash

To: [log in to unmask]

Sent: 2003/04/01 15:39

Subject: Regarding climate change simulation on yield estimation

Dear all

I would like to study the impact of climate change scenario in our

region using crop growth simulation models. But most of the

simulation models (CERES, ORYZA etc) estimate phenology, yield and

yield attributes, with the assumption that suppose 1 degree

increase of mean temperature means it considers adding of 1 degree

increase of temperature to the normal temperature from sowing to

harvest period. But as for as the global temperature is

concerned, this assumption is somewhat true. For regional level,

there may be increase of temperature during the initial period of

the crop ie. during tillering period after that there may be

decrease. In that case, I would like all your attention, what

will be the next step and also how this can be solved?

Thanks to all

With regards,

N. Subash

Scientist (Agricultural meteorology)

ICAR Research Complex for Eastern Region

WALMI Complex

Phulwari Shariff P.O.

Patna 801 505

Bihar

India

Email : [log in to unmask]

_______________________________________________________________________

Odomos - the only mosquito protection outside 4 walls -

Click here to know more!

http://r.rediff.com/r?http://clients.rediff.com/odomos/Odomos.htm&&odomo

s&&wn