5" day - Central Institute of Brackishwater Aquaculture

Ckrhl (bnPhm
Enhaamm of ramimu using hr@i fmili is ropuid m ponds to
i- d~ ph)qhhm prduclbn. Lnapnic fatilireo m syddc fcttilrrm
thd generally conslin a rmount of n kM one of the rmpr p*m nutrients like
nittugen. phosphorus and poussMn k mjor mmiaru arc qrud on 8
prsmtyc by wight buir. Nitrogen is cxprrad u K Pi md phpho~~ .s %
ox& (Pa). Di- h*m, d &opn fadltsrr a mihbk in dte
nurbcmdwme~thm~lahao~a~abuK4ln-.quuu~~c
rhaminrhcTrbk3.
Nlmccr (NO,) lam of hnlllrm vc highly aolubk in water. On .pplicuion In
ponds, r ponion of NO, Iwchcr dopm lo the ducbq zone of che pard and geu
reduced to nitrite f m OJq) ud uhimoly loa lo ekmcnul nitrogen b) the
dcniuify~ng bacterial prrm in the environment. On the othn hand. ammonium
(NIL) canlen ue kaer fcnilizcn u they ue absorbed b) Lhc cxchonpe comples in
the boaom roil and loss due to leaching is rhw avoided. Urea is the wldcl) used
nitrogen fatilizcr in ahrimp ponds. Appliucion oi utu in split d m at regular
intervrlr yield optimum ruuh. It is ccnocntntcd in pnnulu form and ccunplcteI>
wlublr In wrtcr Thc wnwnlo. of wm Into mmon~id and nlmo forms qulm 7 - I4 day1 Urn 18 Idle lo bo loa In hvhinn on!, for 3 - 4 days l&r ml~ut~on
Omc U& is sonvcnod to unmmial form, it is-lbdrbod roil ~ollo~ds ;;d rlowl~
relowed and nitrified to nimm.
Trbk 3. Some of the a ttmou krtilbm commoaly .scd im bnckishwnter
rqaacmltmn
Fenilivr An~hbility
Ammonium rul 20-2 1 K u NH,
Ammonium niwmc
Urn (NHJ CONHI) 46KN