alex5678:
How can illuminance affect smart agriculture?
Plant growth depends on sun light, UV and IR, for photosynthesis etc.
Some plants rely on great amounts of sunlight, others don't.
Tom... 
TomGeorge:
Plant growth depends on sun light, UV and IR, for photosynthesis etc.
Some plants rely on great amounts of sunlight, others don't.
Tom...
What sensors do I need for this kind of measurements?
alex5678:
Also smoke sensor can be used somehow in Smart agriculture
That one would definitely be a good idea. When it detects a good quantity of smoke you know that instead of checking your field you should be checking your seed stocks as your crop just burnt.
alex5678:
What sensors do I need for this kind of measurements?
Cheapest way is a highly qualified argricultial professional, AKA "slave".
Hi,
For your project just a LDR, Light Dependent Resistor, to measure the light falling on the field.
Tom...