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Date: | Sun, 10 Mar 2002 15:06:43 -0500 |
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Dear Mr. Yang,
The SLPF is the same as the soil fertility factor, and includes all soil
factors other than nitrogen-supplying and water-holding traits. It has
nothing to do with the genetic coefficient, LFMAX, potential
light-saturated leaf photosynthesis. However, the SLPF will decrease that
potential genetic photosynthesis rate.
SLPF was calibrated to give values of 0.92 for Florida sandy soils and 1.00
for good Midwestern soils. Your soil really should be in-between those
two. We have used values like 0.95 to 0.97 for North Carolina soils, and
you should be similar. Do not use a value of 1.00 which will overpredict
for you. Note the value under SLPF in the three attached soil files, such
as 0.97 for an Orangeburg sandy loam. I recommend you start with SLFP =
0.95 and see what happens.
The reason for the SLPF is that we do not have soil phosphorus or soil
potassium simulated. We do not have, but could use good contributions from
soil fertility scientists in a manner like Barber and Silberbush did about
15-20 years ago. Such modeling soil fertility types no longer are in our
profession.
Good luck,
Ken Boote
>*IBSB910015 Gainesville 180 Millhopper Fine Sand
>@SITE COUNTRY LAT LONG SCS FAMILY
> -99 -99 -99 -99 Loamy,silic,hyperth Gross.
> Paleudults ( 15)
>@ SCOM SALB SLU1 SLDR SLRO SLNF SLPF SMHB SMPX SMKE
> -99 0.18 5.0 0.50 66.0 1.00 0.92 IB001 IB001 IB001
>@ SLB SLMH SLLL SDUL SSAT SRGF SSKS SBDM SLOC SLCL SLSI SLCF
>SLNI SLHW SLHB SCEC
> 5 -99 0.023 0.086 0.230
> 1.000 7.4 1.36 0.90 -99 -99 -99 -99 5.3 -99 -99
> 15 -99 0.023 0.086 0.230
> 1.000 7.4 1.40 0.69 -99 -99 -99 -99 5.4 -99 -99
> 30 -99 0.023 0.086 0.230
> 0.498 15.8 1.46 0.28 -99 -99 -99 -99 5.7 -99 -99
> 60 -99 0.023 0.086 0.230
> 0.294 28.0 1.47 0.20 -99 -99 -99 -99 5.8 -99 -99
> 90 -99 0.021 0.076 0.230
> 0.380 27.6 1.43 0.09 -99 -99 -99 -99 5.9 -99 -99
> 120 -99 0.020 0.076 0.230
> 0.133 17.5 1.48 0.03 -99 -99 -99 -99 5.9 -99 -99
> 150 -99 0.027 0.130 0.230
> 0.062 0.3 1.57 0.03 -99 -99 -99 -99 5.9 -99 -99
> 180 -99 0.070 0.258 0.360
> 0.031 0.1 1.79 0.03 -99 -99 -99 -99 5.9 -99 -99
>
>
>*IBSB910017 Quincy, FL 203 Orangeburg Sandy Loam
>@SITE COUNTRY LAT LONG SCS FAMILY
> -99 -99 -99 -99 Loamy,silic,hyperth Gross.
> Paleud(17)
>@ SCOM SALB SLU1 SLDR SLRO SLNF SLPF SMHB SMPX SMKE
> -99 0.13 9.0 0.27 84.0 1.00 0.97 IB001 IB001 IB001
>@ SLB SLMH SLLL SDUL SSAT SRGF SSKS SBDM SLOC SLCL SLSI SLCF
>SLNI SLHW SLHB SCEC
> 5 0.125 0.198 0.294 1.000 -9.0 1.49 1.73 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
> 15 0.125 0.198 0.294 0.874 -9.0 1.49 1.73 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
> 25 0.125 0.198 0.294 0.874 -9.0 1.49 1.73 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
> 34 0.117 0.226 0.323 0.351 -9.0 1.41 0.40 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
> 43 0.117 0.226 0.323 0.351 -9.0 1.41 0.40 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
> 53 0.138 0.250 0.332 0.310 -9.0 1.44 0.20 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
> 64 0.138 0.250 0.332 0.310 -9.0 1.44 0.20 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
> 102 0.167 0.281 0.331 0.302 -9.0 1.57 0.14 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
> 145 0.182 0.291 0.334 0.077 -9.0 1.59 0.16 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
> 175 0.162 0.272 0.320 0.036 -9.0 1.61 0.09 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
> 203 0.154 0.263 0.319 0.006 -9.0 1.58 0.03 -9.0 -9.0 -9.0
> -9.00 -9.0 -9.0 -9.0
>
>*IBSB910026 Castana, IO 180 Ida Silt Loam
>@SITE COUNTRY LAT LONG SCS FAMILY
> -99 -99 -99 -99 Ida Silt
> Loam ( 26)
>@ SCOM SALB SLU1 SLDR SLRO SLNF SLPF SMHB SMPX SMKE
> -99 0.12 6.0 0.30 60.0 1.00 1.00 IB001 IB001 IB001
>@ SLB SLMH SLLL SDUL SSAT SRGF SSKS SBDM SLOC SLCL SLSI SLCF
>SLNI SLHW SLHB SCEC
> 5 -99 0.135 0.290 0.485
> 1.000 -99 0.00 0.00 -99 -99 -99 -99 -99 -99 -99
> 15 -99 0.135 0.290 0.485
> 1.000 -99 0.00 0.00 -99 -99 -99 -99 -99 -99 -99
> 30 -99 0.135 0.290 0.485
> 0.175 -99 0.00 0.00 -99 -99 -99 -99 -99 -99 -99
> 45 -99 0.106 0.228 0.514
> 0.138 -99 0.00 0.00 -99 -99 -99 -99 -99 -99 -99
> 60 -99 0.106 0.228 0.514
> 0.138 -99 0.00 0.00 -99 -99 -99 -99 -99 -99 -99
> 90 -99 0.105 0.254 0.517
> 0.188 -99 0.00 0.00 -99 -99 -99 -99 -99 -99 -99
> 120 -99 0.133 0.290 0.507
> 0.250 -99 0.00 0.00 -99 -99 -99 -99 -99 -99 -99
> 150 -99 0.108 0.283 0.505
> 0.213 -99 0.00 0.00 -99 -99 -99 -99 -99 -99 -99
> 180 -99 0.108 0.291 0.542
> 0.100 -99 0.00 0.00 -99 -99 -99 -99 -99 -99 -99
At 03:10 PM 3/8/02 -0500, you wrote:
>Dear members,
>
>I am using CROPGRO-Soybean model within DSSAT35 for simulating the rainfed
>growth of soybean in coastal plain soil in Virginia. The Soil Fertility
>Factor(SLPF) to be required in FILES was mentioned in some papers, such as
>G.G. Wilkerson etc.(2001) and T. Mavromatis etc. (2002). However, I
>couldn't find such a factor in Table 10 Soil Data File (FILES) in Volume 2
>of DSSAT version 3. What matching "SLPF" I found in the Manual is
>Photosynthesis Factor.
>
>Is Photosynthesis Factor the synonym of the Soil Fertility Factor?
>
>Thank you in advance for any help.
>
>Jinzhong Yang
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