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Date: | Wed, 21 May 2003 19:17:20 -0700 |
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Dear Dr. Richard Ogoshi and modellers:
Thanks a lot for your help trying to solve MPLAG in CERES-rice. I have been trying to solve this equation but couldīt get satisfactory results.
I began with the first leaf so CUMPH=1, and followed
CUMPH BF CUMPH-BF XTN DTT PHINT PC TI MPLAG
1 0.12 0.88 -23.33 19.2 83 0.728 0.3177 2.49E-7
1.3177 0.12 1.1977 -32.06 19.1 83 0.7496 0.3070 4.06E-11
1.6247 0.12 1.5047 -43.58 19.05 83 0.7705 0.2979 4.32E-16
XTN= -9.678*EXP(-BF+CUMPH)
PC = 0.66 + 0.068 * CUMPH
TI = DTT / (PHINT * PC)
MPLAG = A / CUMPH * (-BF) * XTN * EXP(XTN) * TI without stress
A= 3800
MPLAG: daily growth of leaf area per plant (cm2/plant) is decreasing when the number of leaves is growing up, I think that there must be something wrong here, but I canīt detect it.
I have a plant population of 337,9 emerged plants per m2.
When calculating how simple leaf area varies with leaf number, I got this:
CUMPH A/CUMPH*(-BF)*XTN*EXP(XTN)
1 7,85E-7
1.3177 1.323215E-10
1.6247 1.448522E-13
I found the when the number of leaves is going up, the leaf area descends.
What is your opinion?. I will be appreciated.
Is BF the previous day leaf area or previous day leaf number?
Sincerely yours:
Luis E. Alvarez L.
Universidad Ezequiel Zamora. UNELLEZ.
Guanare. Estado Portuguesa. Venezuela.
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