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Aquaculture CRSP 21st Annual Technical Report
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209
On-Station Trial of Different Fertilization Regimes Used in Bangladesh

Tenth Work Plan, Appropriate Technology Research 4 (10ATR4A)
Final Report


Yang Yi
Aquaculture and Aquatic Resources Management
Agricultural & Aquatic Systems and Engineering Program
School of Environment, Resources and Development
Asian Institute of Technology
Pathumthani, Thailand

Md. Abdul Wahab
Faculty of Fisheries
Bangladesh Agricultural University
Mymensingh, Bangladesh

C. Kwei Lin and James S. Diana
School of Natural Resources and Environment
The University of Michigan
Ann Arbor, Michigan, USA

Abstract

An on-station trial was conducted in fourteen 100 m2 earthen ponds at the Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh from July through December 2001. This trial was designed to evaluate different fertilization regimes currently used for Aquaculture in Bangladesh and to compare effects of different fertilization regimes on fish production, water quality, and economic returns. There were five fertilization regimes: A) PROSHIKA fertilization regime, weekly application of 1,000 kg cow dung ha-1; B) Bangladesh Rural Advancement Committee (BRAC) fertilization regime, weekly application of
156 kg cow dung ha
-1, 28.125 kg urea ha-1, and 13.1 kg triple superphosphate (TSP) ha-1; C) Caritas fertilization regime, fortnightly application of 1,500 kg cow dung ha-1; D) BAU fertilization regime, fortnightly application of 1,250 kg cow dung ha-1, 31.25 kg urea ha-1, and 15.625 kg TSP ha-1; E) Aquaculture CRSP fertilization regime developed from Nile tilapia (Oreochromis niloticus) ponds, weekly application of 250 kg cow dung (dry matter) ha-1 supplemented with urea and TSP to give 28 kg N and 7 kg P ha-1 wk-1. The six carp species used in this on-station trial were silver carp (Hypophthalmichthys molitrix), mrigal
(
Cirrhinus mrigala), rohu (Labeo rohita), catla (Catla catla), grass carp (Ctenopharyngodon idella), and common carp (Cyprinus carpio) stocked at a ratio of 9:8:6:6:3:2 at a stocking density of 1.02 fish m-2, giving 27, 24, 18, 18, 9, and 6 fish per 100 m2 pond, respectively. Mean stocking sizes of carps ranged from 6.3 to 10.1 g.

Among all tested fertilization regimes, the Aquaculture CRSP fertilization regime resulted in the highest fish production,
followed by the BAU, BRAC, Caritas, and PROSHIKA fertilization regimes (P < 0.05). The two fertilization regimes (PROSHIKA and Caritas) using cow dung as the sole nutrient input during the culture period gave very poor fish growth performance and low production due mainly to the low soluble nutrients derived from cow dung. The other three fertilization regimes (Aquaculture CRSP, BAU, and BRAC) using the combinations of organic and inorganic fertilizers resulted in much higher carp production. Analysis of water quality showed that the nutrients from the Aquaculture CRSP fertilization regime were oversupplied probably because this regime was developed in Nile tilapia monoculture with higher intensification compared to the carp polyculture used in the present trial. The BAU fertilization regime gave the highest profitability among all fertilization regimes, followed by the BRAC and Aquaculture CRSP regimes. Therefore, the BAU fertilization regime is the most appropriate for carp polyculture ponds in Bangladesh while the Aquaculture CRSP fertilization regime is suitable for carp polyculture ponds with higher intensification.
Introduction

Bangladesh is one of the most densely populated countries in the world. Fisheries and aquaculture in particular are vital to
Bangladesh's national economy in terms of nutrition, income, employment generation, and foreign exchange earning (Alam et al., 1996). Currently, approximately 80% of the animal pro