सस्येन परिजातः

Operational rule vidhi

The affix कन् comes in the sense of 'to supply richly with it' after the word सस्य being in the Instrumental -3rd case in construction.

Word by word (padaccheda)

With / by सस्येन tṛtīyā · ekavacanaSubstitute / term परिजातः prathamā · ekavacana

With / by Tṛtīyā (3rd case): accompaniment or means.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

सस्येन परिजातः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix कन् comes in the sense of 'to supply richly with it' after the word सस्य being in the Instrumental -3rd case in construction.
The anuvritti of कन्, not of ठक् is to be read here. The word सस्य here means 'good quality', and not 'corn'. Another reading is शस्य. The word परि means 'all, every where'. That which is full of (परिजात) good qualities (सस्य) in which there is no defect, that is the signification here. Thus सस्येन परिजातः = सस्यकः शालिः 'a rice, above all praise', सस्यकः साधुः 'a good man, not equalled by any'. सस्यको मणिः 'a precious stone of the best quality', i.e. 'perfect in form'.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.