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Subject: Re: rgOEhIFyrEe Author: Tilburg (WvszHqXSRxjFyzP) [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 08:32:20 11/19/14 Wed Jonny was here aim loan The legumes' secret is a process known as nitrogen fixation, carried out in concert with infectious bacteria known as rhizobia, which dwell in little pods inside the tree's roots known as root nodules. As a nutrient, nitrogen is essential for plant growth, but tropical soil is short on nitrogen and surprisingly non-nutritious for trees. Legumes use secretions to invite rhizobia living in the soil to infect their roots, and the bacteria signal back to initiate nodule growth. The rhizobia move into the root cells of the host plant and—in exchange for carbohydrates the tree produces by photosynthesis—convert nitrogen in the air into the fertilizer form that plants need. Excess nitrogen from the legume eventually creates a nitrogen cycle that benefits neighboring trees. [ Next Thread | Previous Thread | Next Message | Previous Message ]