The research performed have aimed at establishing the conditions of th
e NP solutions neutralization with potassium carbonate and ammonia in
order to get NPK solutions with a well defined K2O:P2O5 ratio, solutio
ns used in getting liquid complex fertilizers having microelements inc
luded. The NP and NPK solution viscosities were determined, these bein
g necessary to the technological calculations of the above mentioned c
omplex fertilizers production.