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Old January 26, 2016   #4
4season
Tomatovillian™
 
Join Date: Aug 2014
Location: albuquerque
Posts: 308
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The way I understand it, crab shells contain chitin. Root knot nematode eggs are chitin. When you add crab shells the ground the bugs that eat chitin increase and eat more nematode eggshells.
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