new field
畭 centers on a newly opened or reclaimed field, specifically one that has been cleared or prepared for cultivation.
畭 combines 田 (field) with 余, which likely contributes the sound and may suggest the idea of surplus or extra land being turned into a new field. The exact historical development is uncertain.
A field 田 with something extra 余: imagine a farmer clearing extra land beside an existing field, turning it into a brand-new field ready for planting.
For ヨ, picture a yo-yo bouncing across the new field: yo -> ヨ, and the yo-yo marks the fresh soil.
—