Lots of ideas for people thinking up new applications for agriculture, anywhere. FarmLogs, however, uses the pricing format of software-as-a-service start-up: a free trial, no setup fees, and monthly plans based on the size of operations. Costs range from $9 a month for the smallest farm to $99 a month for farms of more than 2,000 acres. Farmers’ income arrives unevenly, in big lumps over the course of a year rather than in a steady monthly stream. That could make it hard to persuade farmers who are now using notebooks or spreadsheets for record-keeping to add a new and recurring expense category, software-as-a-service, even if the amount is tiny when compared with annual income.