The History of Crop Rotation

12,000 years ago we grow the plant and then took it away and ate it so the nitrogen wasn't returned to the soil. The use of bird shit as a fertilizer had been indigenous knowledge for ages in particular in South America. In 1492 the great nations of Europe discovered quote unquote America and when the Spanish went over to South America they saw I used these cons are growing some pretty good plants here but birdshade are they?