Improve grain crops storage

Improve grain crops storage is an upgrade in Cossacks 3, available at the Mill.

Background
Safe storage of the harvest was of great importance in state economics and for army supplies. Inadequate storage conditions or a polluted environment could result in losing a harvest and would have disastrous effects upon a city or a detachment. Building new granaries and improving storage conditions allowed crops to be preserved for a long time.

Effect

 * Harvesting +250%