The Compendium of Caraka 1.27.199

1.27.199

śvete kaṣāyaṃ bhavati pāṇḍare syāttu tiktakam/
kapile kṣārasaṃsṛṣṭamūṣare lavaṇānvitam//

In white soil it becomes astringent; in pale soil it is bitter; / in tawny soil it is mixed with alkali; in saline soil it possesses saltiness;