'nonviticultural' is formed in English from the prefix 'non-' (meaning 'not') + 'viticultural', where 'viticultural' comes from 'viticulture' (from Latin 'vitis' meaning 'vine' and 'cultura' meaning 'cultivation').

'viticulture' comes from Latin 'viticultura' (from 'vitis' + 'cultura'), entered English via Medieval Latin/Modern French as 'viticulture'; the adjective 'viticultural' developed from that noun, and the negative prefix 'non-' was later attached in English to form 'nonviticultural'.

Originally 'viticultural' meant 'relating to the cultivation of vines'; 'nonviticultural' was formed to mean 'not relating to vine cultivation', preserving the negative-of-field sense.