Two crops grown in the same hru in a single year
Rocky
In the Agricultural Area of our study, there are 2 crops which grown
in the same hru (but not simultaneously) every year. There is a
problem with .mgt file:
After the first set of management for crop 1 (Plant, Fertilization and
Harvest operation), the second set of management (Plant, Fertilization
and Harvest operation) for crop 2 is added using AVSWATX. When running
the model, we found that, for crop 1 everything is ok; but for crop 2,
Fertilization did NOT occur although Pant and Harvest operation has
occurred. I am confused about this.
Any suggestion would be highly appreciated.
Best regards,
Rocky
Rocky, Yiping WU
Thank you so much. I am checking the code.
Another question: I am NOT sure whether the setting of the management
for crop 2 is right or not. What we did is: after crop 1 management,
add Plant, Fertilization, and Harvest operation. Is this setting ok?
Thank you for any suggestion.
Additionally, I use heat units to schedule those operations: when
phuacc is larger than threshold value 0.2, fertilization is executed
once for crop 1 (e.g. on julian date 130); While on the date 131,
model still apply fertilizer a second time due to fertilization
threshold heat unit is set as 0.2 for crop 2. That is to say,
fertilization occurs twice every year as I set, but the second
fertilization occurs before crop 1 harvesting (when phuacc = 1.2) and
crop 2 planting (when phubase =0.65) , although I scheduled
fertilization (phuacc = 0.2) between crop 2 planting and crop 2
harvesting. By the way, If only crop 1 grows in the area, no problem
occurs. Any comments would be appreciated greatly.
Best regards,
Rocky
On 7/21/08, luo yi <luoy...@gmail.com> wrote:
> The best way is to check the code of the model and see how crop growth and
> management are going on.
>
> Good luck.
>
> Yi
> --
> Dr. Luo, Y., Professor
> =============================================================
> Ecohydrological Model Development and Integrated Watershed Management
>
> Institute of Geographic Science and Natural Resources Research(IGSNRR)
> Chinese Academy of Sciences (CAS)
> Datun Road, Anwai, Chaoyang District, 100101, Beijing, China
>
> luoy...@gmail.com, www.laol.fotoyard.com(chn), www.laol.fotoyard.net(eng)
> +86-10-64888920 (Tel. & fax), Cell: 13501312277
> =============================================================
>
Benedikt
I don't think you can grow two crops in the same HRU in the current
SWAT version. Because for example, you can't specify the area each of
the crops is occupying. Therefore, the model has no way of knowing how
much area it has to tread with the parameters of each crop (like curve
number, leaf area index etc, which are very decisive for the
hydrological response and water balance). I think the way this is
meant to be done in SWAT is to specify a HRU for each crop. The
spatial relation of HRUs to each other within a subbasin is not taken
into account in SWAT anyway, and non-contiguous areas of the same
LandUse/Soil/Slope within a subbasin are treated as one HRU by the
model.
However, I am not sure and I'd like to hear if I'm wrong. Although for
the simulated output it probably doesn't matter, it would still be
nice if multiple crops within a HRU were possible since this would be
very practical especially where land cover maps with composite land
cover classes are available.
Cheers,
Benedikt
On Jul 22, 5:58 am, "Rocky, Yiping WU" <wyp10...@gmail.com> wrote:
> Dear Prof. Luo and other SWAT-users,
>
> Thank you so much. I am checking the code.
>
> Another question: I am NOT sure whether the setting of the management
> for crop 2 is right or not. What we did is: after crop 1 management,
> add Plant, Fertilization, and Harvest operation. Is this setting ok?
> Thank you for any suggestion.
>
> Additionally, I use heat units to schedule those operations: when
> phuacc is larger than threshold value 0.2, fertilization is executed
> once for crop 1 (e.g. on julian date 130); While on the date 131,
> model still apply fertilizer a second time due to fertilization
> threshold heat unit is set as 0.2 for crop 2. That is to say,
> fertilization occurs twice every year as I set, but the second
> fertilization occurs before crop 1 harvesting (when phuacc = 1.2) and
> crop 2 planting (when phubase =0.65) , although I scheduled
> fertilization (phuacc = 0.2) between crop 2 planting and crop 2
> harvesting. By the way, If only crop 1 grows in the area, no problem
> occurs. Any comments would be appreciated greatly.
>
> Best regards,
> Rocky
>
>
>
>
> > The best way is to check the code of the model and see how crop growth and
> > management are going on.
>
> > Good luck.
>
> > Yi
>
>
> >> Dear SWAT-user,
>
> >> In the Agricultural Area of our study, there are 2 crops which grown
> >> in the same hru (but not simultaneously) every year. There is a
> >> problem with .mgt file:
>
> >> After the first set of management for crop 1 (Plant, Fertilization and
> >> Harvest operation), the second set of management (Plant, Fertilization
> >> and Harvest operation) for crop 2 is added using AVSWATX. When running
> >> the model, we found that, for crop 1 everything is ok; but for crop 2,
> >> Fertilization did NOT occur although Pant and Harvest operation has
> >> occurred. I am confused about this.
>
> >> Any suggestion would be highly appreciated.
>
> >> Best regards,
> >> Rocky
>
> > --
> > Dr. Luo, Y., Professor
> > =============================================================
> > Ecohydrological Model Development and Integrated Watershed Management
>
> > Institute of Geographic Science and Natural Resources Research(IGSNRR)
> > Chinese Academy of Sciences (CAS)
> > Datun Road, Anwai, Chaoyang District, 100101, Beijing, China
>
>
> - Show quoted text -