Pigeon Towers: A Low-Tech Alternative to Synthetic Fertilizers

[2] Pigeon towers became a crucial part of the agricultural economy, providing much-needed fertilizer for melons, cucumbers, and other nitrogen-demanding crops—cornerstones of Persian cuisine. Most pigeon towers still around today are in the area of Isfahan, the second most populous region in Iran. Despite their decreased use, pigeon towers have some benefits over other low-tech alternatives in use today, such as the practice of some organic farmers to roll chicken coops over their fields.

Source: www.notechmagazine.com