On a bright January morning in Tamil Nadu’s Kuravapulam village, Sivaranjini S. closes the door to her kitchen, picks up a spiral-bound notebook, and walks into the paddy fields adjacent to her home. Her husband, Saravanakumaran P., follows her into the fields, adjusting his blue rubber boots as he walks past a line of palm trees that mark the boundary of their land. At first glance, this farm in the Nagapattinam district resembles any other paddy field in coastal Tamil Nadu.