Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds

Nitrogen and phosphorous are two important key elements in aquaculture production system. So, understanding of nitrogen and phosphorous losses as well as incorporations into in different production system are also very important to reduce eutrophication, and to achieve higher fish production. Howeve...

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Main Authors:	Rahman, Mohammad Mustafizur, Verdegen, M.C.J., Wahab, M.A., Verreth, J.A.J.
Format:	Conference or Workshop Item
Language:	English
Published:	2005
Subjects:	SH Aquaculture. Fisheries. Angling
Online Access:	http://irep.iium.edu.my/38146/ http://irep.iium.edu.my/38146/1/Bali-2005.pdf

id	iium-38146
recordtype	eprints
spelling	iium-381462014-09-12T05:16:27Z http://irep.iium.edu.my/38146/ Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds Rahman, Mohammad Mustafizur Verdegen, M.C.J. Wahab, M.A. Verreth, J.A.J. SH Aquaculture. Fisheries. Angling Nitrogen and phosphorous are two important key elements in aquaculture production system. So, understanding of nitrogen and phosphorous losses as well as incorporations into in different production system are also very important to reduce eutrophication, and to achieve higher fish production. However, due to lack of real recommendation on how nitrogen and phosphorous are lost and incorporated into in semi-intensive mono and polyculture systems, an experiment was conducted to know the quantity of nitrogen and phosphorous losses and incorporations into in semi-intensive mono and polyculture systems. The experiment was conducted in earthen ponds having six treatments with three replications. All ponds were fertilized with fertilizers: 1,250.0 kg ha-1 decomposed cow manure, 31 kg ha-1 urea and 157 kg ha-1 triple super phosphate before beginning of the experiment and thereafter fortnightly intervals. Two monoculture treatments (one receiving supplementary feed and another receiving no feed) were stocked with 15,000 rohu (Labeo rohita) ha-1. Among four polyculture treatments, two treatments (one receiving supplementary feed and another no feed) were stocked with 15,000 rohu plus 5,000 common carp (Cyprinus carpio) ha-1 and rest two (one receiving supplementary feed and another no feed) were stocked with 15,000 rohu plus 10,000 common carp ha-1. After four and half months long experiment, it was found, average nitrogen and phosphorous losses were higher in monoculture system than in polyculture system, conversely; average percent incorporation of nitrogen and phosphorous into were higher in polyculture system than in monoculture system. Similar relations were observed when compared between fed and unfed systems. Nitrogen and phosphorous losses were higher in treatments with feed than the treatments with no feed, conversely; nitrogen and phosphorous incorporation into were in treatments with feed than the treatments with no feed. These results may also be affected on types of cultured physico-chemical properties of pond as well quality and quantity of supplementary feed. 2005 Conference or Workshop Item NonPeerReviewed application/pdf en http://irep.iium.edu.my/38146/1/Bali-2005.pdf Rahman, Mohammad Mustafizur and Verdegen, M.C.J. and Wahab, M.A. and Verreth, J.A.J. (2005) Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds. In: World Aquaculture 2005, 9-13 May 2005, Bali, Indonesia. (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	SH Aquaculture. Fisheries. Angling
spellingShingle	SH Aquaculture. Fisheries. Angling Rahman, Mohammad Mustafizur Verdegen, M.C.J. Wahab, M.A. Verreth, J.A.J. Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds
description	Nitrogen and phosphorous are two important key elements in aquaculture production system. So, understanding of nitrogen and phosphorous losses as well as incorporations into in different production system are also very important to reduce eutrophication, and to achieve higher fish production. However, due to lack of real recommendation on how nitrogen and phosphorous are lost and incorporated into in semi-intensive mono and polyculture systems, an experiment was conducted to know the quantity of nitrogen and phosphorous losses and incorporations into in semi-intensive mono and polyculture systems. The experiment was conducted in earthen ponds having six treatments with three replications. All ponds were fertilized with fertilizers: 1,250.0 kg ha-1 decomposed cow manure, 31 kg ha-1 urea and 157 kg ha-1 triple super phosphate before beginning of the experiment and thereafter fortnightly intervals. Two monoculture treatments (one receiving supplementary feed and another receiving no feed) were stocked with 15,000 rohu (Labeo rohita) ha-1. Among four polyculture treatments, two treatments (one receiving supplementary feed and another no feed) were stocked with 15,000 rohu plus 5,000 common carp (Cyprinus carpio) ha-1 and rest two (one receiving supplementary feed and another no feed) were stocked with 15,000 rohu plus 10,000 common carp ha-1. After four and half months long experiment, it was found, average nitrogen and phosphorous losses were higher in monoculture system than in polyculture system, conversely; average percent incorporation of nitrogen and phosphorous into were higher in polyculture system than in monoculture system. Similar relations were observed when compared between fed and unfed systems. Nitrogen and phosphorous losses were higher in treatments with feed than the treatments with no feed, conversely; nitrogen and phosphorous incorporation into were in treatments with feed than the treatments with no feed. These results may also be affected on types of cultured physico-chemical properties of pond as well quality and quantity of supplementary feed.
format	Conference or Workshop Item
author	Rahman, Mohammad Mustafizur Verdegen, M.C.J. Wahab, M.A. Verreth, J.A.J.
author_facet	Rahman, Mohammad Mustafizur Verdegen, M.C.J. Wahab, M.A. Verreth, J.A.J.
author_sort	Rahman, Mohammad Mustafizur
title	Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds
title_short	Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds
title_full	Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds
title_fullStr	Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds
title_full_unstemmed	Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds
title_sort	nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds
publishDate	2005
url	http://irep.iium.edu.my/38146/ http://irep.iium.edu.my/38146/1/Bali-2005.pdf
first_indexed	2023-09-18T20:54:46Z
last_indexed	2023-09-18T20:54:46Z
_version_	1777410230060056576

Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds

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