Bret4207
At the casting bench in the sky. RIP Bret.
Ok guys, rain may pick up N2 from the atmosphere but your grass can't fix nitrogen. N2 is very chemically stable and requires immense energy to break down. Few plants have the ability but legumes can do it.
Unless your lawn is alfalfa or clover then the N2 picked up by the falling rain isn't relevent.
Nitrogen in rain absolutely benefits any non-legume plant deficient in N. No the grass can't fix it like legumes, but it definitely uses it. N is one of the primary fertilizers for all you grasses like corn., sorghum, etc. Too much burns it, too little and it gets stunted. That's why we follow a leguminous crop with grains/grasses. The nitrogen released from the decaying legumes is used by the following crops.
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