Peasants applied mostly natural fertilizers, such as manure, mulch, and bat guano.
From the en.wikipedia.org
Bat guano is bat excrement, prized as an agricultural fertilizer.
From the en.wikipedia.org
For instance, the other day a gardening expert on the radio was touting the benefits of guano, or bat droppings.
From the chron.com
Then, at the urging of a local naturalist, Dino Tlachac, they donated the old cedar siding and bat guano to build bat houses in a nature preserve on their street.
From the abcnews.go.com
The smell of bat guano is overpowering and I'm soon glad to be in the sunlight, heading back to our resort.
From the au.news.yahoo.com
When it looks like a race is going to be as boring as bat guano, flick the switch and watch the fun and games begin.
From the nzherald.co.nz
It takes a big man to step forward and admit that he reeks like an old man's shoe that's been filled with bat guano.
From the hecklerspray.com
The bulges were caused by deposits of bat guano that had built up over the years as the bat colony grew, pushing parts of the siding outward.
From the abcnews.go.com
England, who runs Kickback Alpacas on a nearby ranch, says alpaca dung is a close second to bat guano in fertilizer excellence.