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  1. 2004-04-20 Terra preta is very productive soil with long-lasting fertility—unusual in the tropics, where most soils are very weathered, highly acidic, and low in organic matter and essential nutrients. The key to terra preta soils long-term fertility seems to be charcoal; terra preta contains up to 70 times...  
  2. 1995-03-19 Tepary beans are a very drought resistant bean.  
  3. 2010-10-20 Input from the ECHO network concerning the use of urine as a fertilizer.  
  4. 1982-05-19 Many of you are familiar with the book Under-exploited Tropical Plants with Promising Economic Value. In the early 1970s , the U.S. National Academy ofSciences surveyed scientists around the world to determine which plants had the greatest potential for introduction to other tropical countries....  
  5. 1994-07-19 Nitrogen fertilizer should not be applied to trees and shrubs directly after transplanting.