I have a question, Does any one have any experience with soil sensing with any of the moisture sensors? I am waiting to receive a few Funduino moisture sensor but there is no spec from what I see out there for any of these type of sensors. I am concerned that they will corrode in the ground after an extended period of time. I was thinking about not keeping Vcc on continuously and just applying as needed when I take an ADC sample. Also will I need to sense the temperature of the soil as well? Are these types of sensors reliable or is there another approach?