Largest capacity nitrogenous fertiliser plants $(2700$ tons of NH$3$ per day$)(2$ Nos.$)$ in India are located at

Thal$-$Vaishet $($under RCF in Maharashtra$)$ and Hazira $($under IFFCO in Gujarat$)$

Talcher $($Orissa$)$ and Ramagundam $($A$.$P$.)$ both under FCI

Korba $($M$.$P$.)$ and Talcher $($Orissa$)$ both under FCI

Haldia $($W$.$B$)$ and Namrup $($Assam$)$ both under HFC