Subject: | |
From: | |
Reply To: | |
Date: | Mon, 25 Aug 1997 18:57:17 EST |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
List members,
My company, Abt Associates, is working as a contractor for the U.S. EPA on a
project to analyze potential effects of climate change on the U.S. corn crop.
We are using CERES-Maize in DSSAT v3 to model corn yield. As part of this work,
we are looking for DSSAT genetic coefficients for the following varieties of
corn, which are commonly used in Nebraska:
DEKALB 591
PIO 3162
Cargill 7777
Fontanelle 5325
NC+ 5037
If anyone has developed coefficients for these cultivars, or can refer me to
someone who can help me, I would greatly appreciate hearing from you.
Best regards,
Ben Strauss
P.S. The genetic coefficients required for maize by CERES-Maize are as follows:
P1 Thermal time from seedling emergence to the end of the juvenile phase
(expressed in degree days above a base temperature of 8 deg C) during
which the plant is not responsive to changes in photoperiod.
P2 Extent to which development (expressed as days) is delayed for each hour
increase in photoperiod above the longest photoperiod at which
development proceeds at a maximum rate (which is considered to be 12.5
hours).
P5 Thermal time from silking to physiological maturity (expressed in degree
days abobe a base temperature of 8 deg C).
G2 Maximum possible number of kernels per plant.
G3 Kernel filling rate during the linear grain filling stage and under
optimum conditions (mg/day).
PHINT Phylochron interval; the interval in thermal time (degree days) between
successive leaf tip appearances.
****************************************************************
Ben Strauss Tel: 301.913.0509
Abt Associates, Inc. Fax: 301.652.7530
4800 Montgomery Lane Email: [log in to unmask]
Suite 600
Bethesda, MD 20814
|
|
|