[unearth3d]

Synth. N results in plant cells (specifj ally sieve plates) being weaker, for instance roof thatching from urea-fertilised crops lasts a tenth of the time of organic. Synth N's different isotope form is also a key way of determining organic food certification.

[lazide]

lulz. Manure causes way wider isotopic variaion than synthetic fertilizer (and always has). https://wwwrcamnl.wr.usgs.gov/isoig/period/n_iig.html

“ Soil-derived nitrate and fertilizer nitrate usually have overlapping compositions, preventing their separation using 15N alone.”