Drivers of Grass Pea ( Lathyrus sativus L .) Market Supply and Its Sustainability Payoffs: Evidence From Jama District, Ethiopia

Grass pea ( Lathyrus sativus L .) is a climate‐smart legume crop widely grown in Ethiopia, well‐known for its resilience to abiotic stresses, and serves as an insurance crop. Despite its ecological and agronomic benefits, the crop's market supply remains underexplored from both economic and sustainability perspectives. This study examines the determinants of grass pea market supply and its broader implications for ecological resilience and smallholder sustainability. Two hundred fifty grass pea producers were selected using a two‐stage random sampling technique. Data on household characteristics, multi‐year yields, income recall, follow‐up crop yields, and perception‐based Likert‐scale responses were collected through structured questionnaires. The Box‐Cox regression model was employed to analyze determinants of grass pea market supply. Results indicate that farm experience, land size, yield, credit access, and livestock ownership significantly enhance market supply, whereas distance to the market negatively affects participation. Moreover, t /χ 2 test results show that farmers with higher market supply levels reported greater adoption of sustainable practices, higher follow‐up crop yields, and stronger agreement on the grass pea's ecological benefits. Based on the findings, this study recommends that policy initiatives should focus on increasing smallholders' access to reasonably priced credit, enhancing rural transportation and market linkages to lower transaction costs, and providing focused training on soil fertility and market‐oriented production, particularly for subsistence farmers. These initiatives will promote sustainable agricultural systems and economic growth if they are incorporated into local extension programs and aligned with Ethiopia's Climate‐Smart Agriculture policies.