Solum

A year ago, Inc. reported on start-up called Solum, that optimizes crop output by focusing on soil. Today, Solum has a $17 million investment from Andreessen Horowitz and Khosla Ventures.

Solum’s No Wait Nitrate system measures soil-nitrate levels, while its Readout Ready field lab measures nutrients and micro-nutrients.

Both are GPS-enabled, to help farmers get a sense of their land.