धान्यमूला हि दुर्गादीनां कर्मणामारम्भाः ॥ कZ_०७.११.११ ॥
dhānyamūlā hi durgādīnāṃ karmaṇām ārambhāḥ
The initiation of fortification and related works is rooted in grain (i.e., a grain base).
Because large works require sustained labor and garrisons; grain is the primary input that keeps workers and soldiers supplied.
Prioritize agricultural surplus and storage systems before expanding fixed defense infrastructure.