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Onion Root Crops - Agriculture & Science Directory

• The Onion
  
  The condition of onion leaves is a good indicator of the maturity and general state of the bulb. Bulb onions which are to be stored should be allowed to mature fully before harvest and this occurs when the leaves bend just above the top of the bulb a ...
  http://www.fao.org/inpho/content/compend/text/ch26_02.htm