"$.04 per lb of N.
$.70 per lb N is about standard currently for uan32" according to a random redditor (lost link, pulling from second-hand Signal chat history)
Highly inefficient chemically, and produces salt nitrate, but energy is cheap enough it seems to beat out offsite transport
```
~250kg/ salt nitrate per ha
ha farm feeds comfortably 10 ppl year round.
25kg salt per person/yr
12.5kg nitrate/person per year
60 g per kWh
1kWh/.06kg*12.5kg
208kWh/person/yr (less than 1 300W solar panel pp)
estimate $0.1/kWh
$20 e- per year per person best case
```
All I've got on it. Needs Potassium and Phosphorus supplements for ideal fertilizer still. Very neat though, and seemingly a sizable step economically - especially where fertilizer costs are the farming bottleneck. Can almost make self-contained plant + solar + water collection + harvesting bot + green lightning units that grow indefinitely without any inputs but air, rain and sun.
"$.04 per lb of N. $.70 per lb N is about standard currently for uan32" according to a random redditor (lost link, pulling from second-hand Signal chat history)
Appears to use this https://en.wikipedia.org/wiki/Birkeland%E2%80%93Eyde_process
Highly inefficient chemically, and produces salt nitrate, but energy is cheap enough it seems to beat out offsite transport
```
~250kg/ salt nitrate per ha ha farm feeds comfortably 10 ppl year round. 25kg salt per person/yr 12.5kg nitrate/person per year
60 g per kWh 1kWh/.06kg*12.5kg 208kWh/person/yr (less than 1 300W solar panel pp) estimate $0.1/kWh $20 e- per year per person best case
```
All I've got on it. Needs Potassium and Phosphorus supplements for ideal fertilizer still. Very neat though, and seemingly a sizable step economically - especially where fertilizer costs are the farming bottleneck. Can almost make self-contained plant + solar + water collection + harvesting bot + green lightning units that grow indefinitely without any inputs but air, rain and sun.