Abstract <p>Organic food markets in “low-share, small-area” contexts depend on how producer motivations interact with outlets and crop structures. Using confidential microdata from a nationally administered Japanese government survey (Aug–Sep 2021; n = 2,647), this study identifies motivation segments and links them to marketing channels and farm structure. A validated latent class model with direct effects retains two classes and good separation; posterior-weighted shares are 73.8% (extrinsic-oriented) and 26.2% (intrinsic-oriented). Covariate effects are estimated via the improved three-step (R3STEP) maximum-likelihood approach with misclassification correction. Membership in the intrinsic class is positively associated with direct-to-consumer sales, diversified crop portfolios (notably vegetables), and higher organic land shares, and negatively associated with JA (Japan Agricultural Cooperatives) outlets and years in organic farming. To triangulate market implications, an auxiliary descriptive check estimates average marginal effects (AMEs) from a simple logit for premium incidence: moving to direct selling raises the probability of reporting a premium by about + 6.6 percentage points among vegetable producers, but not among rice producers, aligning with the segmentation. Findings quantify the motivational composition of certified operators in Japan and map segments to structures and channels with clear market relevance. Policy implications emphasize a twin-track mix: cost/risk instruments and coordination supports for the large extrinsic segment, and credibility-enhancing certification/traceability and channel broadening (e.g., pooled small-lot logistics, direct-to-consumer or contract-based channels) for the intrinsic segment.</p> Highlights <p>- National microdata (Japan, 2021; <i>n</i> = 2,647) segmented organic producers via LCA + R3STEP.</p> <p>- Two motivation classes (posterior-weighted): 73.8% extrinsic vs. 26.2% intrinsic.</p> <p>- Intrinsic class links to direct-to-consumer channels, vegetables, and higher organic shares.</p> <p>- JA outlets and longer organic tenure align with the extrinsic profile.</p> <p>- Policy: twin-track—risk/cost tools and coordination for the extrinsic segment; credibility and channel broadening for the intrinsic segment.</p> Graphical Abstract <p></p>