धान्यवृद्धिः सस्यनिष्पत्ताव् उपार्धा परं मूल्यकृता वर्धेत ॥ कZ_०३.११.०४ ॥
dhānyavṛddhiḥ sasyaniṣpattāv upārdhā paraṃ mūlyakṛtā vardheta
For grain-loans, the increase at harvest may be up to one-half; beyond that, any increase must be justified by price (market valuation).
He allows a harvest-linked premium (reflecting seasonality) but restrains arbitrary extraction by tying further increases to observable market prices.