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Date: | Wed, 21 May 2003 17:14:00 -1000 |
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Hello Luis,
In the equation that calculates XTN, you have the quantity (-BF+CUMPH)
below. The quantity should be (-BF*CUMPH) instead. So, at CUMPH = 1, XTN =
-8.58.
Also, remember that the value of XTN is also a function of CUMPH, so it
will have to vary with CUMPH as well as MPLAG. This might take care of the
descending area value as the leaf number (CUMPH) increases.
I hope this helps.
Sincerely,
Richard
At 07:17 PM 05/21/2003 -0700, you wrote:
> 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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