Grammatical Sūtra: कृषेश्छन्दसि kṛṣeśchandasi 
Individual Word Components: kṛṣeḥ chandasi
Sūtra with anuvṛtti words: kṛṣeḥ chandasi aṅgasya (6.4.1), abhyāsasya (7.4.58), cuḥ (7.4.62), na (7.4.63), yaṅi (7.4.63)
Type of Rule: pratiṣedha
Preceding adhikāra rule:7.3.10 (1uttarapadasya)
Description:
The Palatal is not substituted for the Guttural of the reduplicate of ((kṛṣ)) in the Veda, when in the Intensive. Source: Aṣṭādhyāyī 2.0
In the Chándas [a palatal stop (c) 62 does not 63 replace the velar stop (k) 62 of the reduplicated syllable 58 of the verbal stem] kr̥ṣ- `draw, drag, plough' (1.1.39) [before 1.1.66 the intensive marker yáṄ 63]. Source: From Aṣṭādhyāyī of Pāṇini In Roman Transliteration translated by Sumitra M. Katre, Copyright © 1987. Courtesy of the University of Texas Press.