If you’ve any doubt that technology is in a rush to disrupt agriculture, consider the scene at this week's AgTech Silicon Valley 2015 conference. Amid well-attended sessions covering the Internet of Things in farming, water reuse technology and agricultural data — where neatly-dressed Silicon Valley types mixed with suntanned and scruffy-shoed farmers — one session was standing room only. It was the pitch session where entrepreneurs got four minutes to sell an ag tech busines