http://www.agroblogger.com/2007/04/27/the-photosynthetic-ceiling/ Agroecology...agroforestry...agrorevolution Tue, 02 Feb 2010 00:05:36 -0700 http://wordpress.org/?v=2.8.4 hourly 1 http://www.agroblogger.com/2007/04/27/the-photosynthetic-ceiling/comment-page-1/#comment-14193 Michelle Meaders Thu, 07 Jun 2007 15:38:57 +0000 http://www.agroblogger.com/2007/04/27/the-photosynthetic-ceiling/#comment-14193 Maybe the difference between North and South America's production is related to the difference in soil. We have deep, rich glacier-produced prarie soil (which we are wasting at an alarming rate). They have the thin, nutrient-poor soil of the humid tropics, which when cleared, can't grow much for long. Pressure for cash crops and beef has replaced the forest-grown crops with monoculture or clearing.