[Year 12 SofDev] VITTA SD exam 2 case study

[Mark Kelly]

Thanks, Fiona.  On the other hand, the Soil Wetness sensors would not 
test current precipitation; they just report how wet the soil is, even 
if the rain had stopped.

I'm guessing it has something to do with pesticide leaching through the 
soil into aquifers, or rottweilers, or something like that  :-)

Fiona Mackenzie wrote:
> Hi Mark
> 
> You can't spray pesticide when it is raining - it washes off. Also, I wouldn't spray if the sprinklers were on for the same reason.
> 
> Cheers
> Fiona
> 
>>>> Mark Kelly <kel at mckinnonsc.vic.edu.au> 10/12/07 3:16 PM >>>
> Can anyone help me with the logic of the algorithm in the VITTA SD exam 
> 2 case study?
> 
> The criteria for needing to spray are: pesticide is needed, and wind is 
> slight.  The Final decision before spraying, however, relates only to 
> wind speed and soil wetness.
> 
> The sample answer says the soil wetness reading is needed to ensure that 
> "it's the right time to spray the pesticide".  Apparently it's not good 
> to spray if the soil is too wet.
> 
> Do any agricultural boffins out there know how soil wetness plays a part 
> in being the "right time" to spray?
> 
> It seems more of an Ag Science question than an SD question!
> 
> Mark
> 


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