Dear Dharam Dabas
Parameters P1, RATPOT should not be changed.  These are used to ensure
a coupling between the DSSAT and Canegro.  You need the following field
measurements to determine the parameters for cultivars that differ a lot
from NCo376.  (Values for NCO376 given in brackets)

LFMAX (11.0)
The maximum green leaf number observed on a well watered crop that is
old enough to have senesced several leaves from the bottom.

G1 (1)
A stalk population/leaf width type index.  This is explained in the CUL
file.  You will need stalk population at harvest and leaf width of fully
expanded leaves.  The fully expanded width of leaves initially increase
with leaf number on the stalk counting from the bottom, so you will have
to measure width until it reaches a max (somewhere after leaf no. 15).


PI1 (109) , PI2 (169)
The thermal time (base 10) between the emergence of succesive leaves.
Record the date of appearance of new leaves and plot that against
thermal time (Sum of positive values of (Tmax+Tmin)/2-10)).  The plot
should show two distinct linear relationships.  The inverse of the slope
of each equals PI1 and PI2.  The thermal time breakpoint between the two
relationships is DTPI (1526)

I hope this helps
Thanks



Abraham Singels
Agronomy Department, Experiment Station
S.A. Sugar Association
Private bag X02,
Mount Edgecombe 4300
South Africa

Tel: 031-5393205         Fax: 031-5395406
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www.sugar.org.za/sasex/about/agronomy.htm

>>> [log in to unmask] 03 July 2002 06:54:24 >>>
Dear listers,

Would somebody of you please guide me as to what minimum observations
are needed to find out the genetic coefficients of the sugarcane
varities for DSSAT 3.5. It will be helpful if the size of destructive
sampling can be indicated for reliable data.

Thanking you in advance,

Dharam Dabas
CCS Haryana Agricultural University,
Hisar 125004 India

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