Like it said before,,,,,What are you trying to get at here? That the plant uptakes and creates nitrite based nutrients (including how ammonia [both uptaken and made by the plant forms] are incorporated for use), that it then transports around the plant for use.......yeah so? Whats your point? It makes NO difference what you think you understand here. The point we're making is, YOU can not "FLUSH" that from the plant (nore all the other ones you left out)! All you did was cut and paste an out of context section of some paper you found on the net in a feeble attempt to say you understand how plants uptake nutrition.
BTW, you left out lots of other nutrients - care to cut and paste the rest of the paper? Or was it only on Nitrate use by plants?