Monsanto has acquired the soil science division of Solum Inc., a San Francisco agriculture tech company, for an undisclosed price. The biotech giant will tuck the business unit into The Climate Corp., the farming data and insurance company that Monsanto picked up late last year for around $930 million. What’s left of Solum is relaunching as Granular, an online software and analytics service for farmers. Andreessen Horowitz, Google Ventures and Khosla Ventures have invested $4.2 million in the new company. Granular will plug that money plus proceeds from the sale into developing its business software.