DSSAT,
Jim's lint percentage seems appropriate for "hand picked" cotton. Typical machine picking lint percentages vary from 0.30-0.35 with 0.33 kind of an average; stripper harvest lint percentages are lower at about 0.18-0.27 with about 0.23 being an average. Stripper cotton is not used much outside Texas, Oklahoma, or Kansas. The reasons are: 1) hand picking picks little "trash"; 2) pickers get a little more "trash"; and strippers may or may not harvest the "burs" plus even more trash (bark, etc.). FYI.
Terry
Terry A. Howell, PhD, PE, D WRE
Research Leader
USDA-ARS
Soil & Water Management Research Unit
P.O. Drawer 10
2300 Experiment Station Rd. (shipping)
Bushland, TX 79012-0010
(806) 356-5746 | (806) 356-5750 [fax]
[log in to unmask] [email]
http://www.cprl.ars.usda.gov [internet]
________________________________
From: DSSAT - Crop Models and Applications on behalf of Automatic digest processor
Sent: Sat 8/4/2007 11:01 PM
To: Recipients of DSSAT digests
Subject: DSSAT Digest - 3 Aug 2007 to 4 Aug 2007 (#2007-56)
There is one message totalling 56 lines in this issue.
Topics of the day:
1. cotton yields
----------------------------------------------------------------------
Date: Sat, 4 Aug 2007 03:50:57 -0400
From: "Jones,Jimmy W" <[log in to unmask]>
Subject: Re: cotton yields
Ivan,
The cotton yield simulated by the DSSAT cotton model is the seed cotton
yield. The lint to seed fraction is pretty stable at about 0.40. We have
been estimating lint yield as 0.40*seed cotton yield
Jim Jones
-----Original Message-----
From: DSSAT - Crop Models and Applications
[mailto:[log in to unmask]] On Behalf Of Dong, Ivan
Sent: Friday, August 03, 2007 11:16 AM
To: [log in to unmask]
Subject: cotton yields
Hi DSSAT users,
I am playing with the cotton experiments in DSSAT, and I'm wondering
exactly what yield number is reported. The yields is the sample
experiments (AZMC8901, GACM0305) are in the 3000-4000 kg/ha range.
That's about 2500-3500 pounds / acre if I did that conversion right.
However, the US yield of cotton is only 800-900 pounds / acre according
to USDA production reports. Are the cotton yields in DSSAT referring to
the same yields in the USDA reports?
Thank you for your help,
Ivan
------------------------------------------------------------------------
-------------------------
-------------------------
CONFIDENTIALITY AND SECURITY NOTICE
The contents of this message and any attachments may be privileged,
confidential and proprietary and also may be covered by the Electronic
Communications Privacy Act. If you are not an intended recipient, please
inform the sender of the transmission error and delete this message
immediately without reading, disseminating, distributing or copying the
contents. Citadel makes no assurances that this e-mail and any
attachments are free of viruses and other harmful code.
------------------------------
End of DSSAT Digest - 3 Aug 2007 to 4 Aug 2007 (#2007-56)
*********************************************************
|
