Nagatsune first conducted the technical improvement of rice cultivation in Tahara, and among the measures taken by him the introduction to remove pests from rice fields with whale oil is believed to have brought great success.
永常はまず田原で稲作の技術改良を行い、特に鯨油によるイネの害虫駆除法の導入は大きな成果につながったといわれている。