The Israeli Journal of Aquaculture Bamidgeh 56(4), 2004, 256-263

 
USE OF NITRIFICATION INHIBITORS TO INCREASE EFFICIENCY 
OF NITROGENOUS FERTILIZERS IN AQUACULTURE


Amrita Thakur, Abira Banerjee and G.N. Chattopadhyay* 

Soil Testing Laboratory, Institute of Agriculture, Visva Bharati, Sriniketan 731236, 
West Bengal, India 


(Received 27.1.04, Accepted 9.6.04)


Key words: nitrogen fertilization, nitrification inhibitors, primary productivity


Abstract


High doses of nitrogenous fertilizers are often applied in fishponds but only a small part of the added nitrogen is utilized for improving primary productivity and, thereby, fish yields. A large portion of the nitrogen is lost from the pond environment through various mechanisms, especially nitrification. In the present investigation, we studied the effects of three nitrification inhibitors: (a) neem (Azadirachta indica) extract, (b) karanj (Pongamia glabra) extract, and (c) sodium azide (NaN3), on the transformation of applied nitrogen in simulated fishpond conditions. The study revealed that nitrification inhibitors considerably retard the rate of nitrification from the ammonium form of nitrogen (NH4+), resulting in a higher amount of nitrogen in the soil and water. The increased nitrogen concentration significantly increased gross primary production and, hence, improved the efficiency of the added nitrogen. 


* Corresponding author. E-mail: gunin_c@yahoo.com

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