त्रीन् करीषांश्च जनयंस्तत्र सस्यागमो ध्रुवः ॥ कZ_०२.२४.१०च्द् ॥
trīn karīṣāṃś ca janayaṃs tatra sasyāgamo dhruvaḥ
Where it produces three (measures/layers) of manure (karīṣa), there the coming of crops (a harvest) is assured.
It operationalizes fertility as an input standard—useful for state farms, leases, and audits of cultivator performance.