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View submission: What non-biological factors contribute to regional soil fertility?
Building off this are several smaller factors that influence each of these. Things like soil strata (when there may be a harder clay layer of soil closer to the surface which reduces root penetrance and water potential of the plant) or pH (binds certain nutrients more closely to soil particles making it more difficult for the plant to uptake).
Regarding nitrogen, I was under the impression that inorganic N wasn't an issue with DNA reproduction per se, but is a huge issue in photosynthesis as N is a primary component of chlorophyll and acts as the first step of the electron transport in carbon fixation. If the plant doesn't have enough N to generate ATP, then it certainly won't have enough to reproduce DNA
There's nothing here!