[Year 12 SofDev] VITTA SD exam 2 case study

[Fiona Mackenzie]

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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