soil moisture sensor

I was wondering if someone could help and guide me in a little project that I am working on. I am making an automated watering system for my wife. I can't seem to wrap my head around the 'C' script/code. This is what I want to happen. Using an LDR I wish to determine weather it is day or...

Hai Friends, I would like to design a soil moisture sensor using TDR technology since TDR based moisture sensors are more accurate than capacitive or resistance-based moisture sensors. But I don't have any idea about it. Can anyone help me in finding a solution for it?