| Nitrogen and phosphorous losses in semi-intensive mono and polyculture systems: very significant difference between fed and unfed ponds (2005) | |||||||||
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| NITROGEN AND PHOSPHOROUS LOSSES SEMI INTENSIVE MONO AND POLYCULTURE SYSTEMS VERY SIGNIFICANT DIFFERENCE BETWEEN FED AND UNFED PONDS Rahman Verdegem wahab and Verreth Fish Culture and Fisheries Group Wageningen University and Research Center Wageningen The Netherlands mustafizur rahman wur Nitrogen and phosphorous are two important key elements aquaculture production system understanding nitrogen and phosphorous losses well incorporations into fish flesh different production system are also very important reduce eutrophication and achieve higher benefit However due lack real recommendation how nitrogen and phosphorous are lost and incorporated into fish flesh semi intensive mono and polyculture system experiment was conducted know the quantity nitrogen and phosphorous losses and incorporations into fish flesh semi intensive mono and polyculture systems The experiment was conducted earthen ponds having six treatments with three replications All ponds were fertilized with fertilizers decomposed cow manure urea and triple super phosphate before beginning the experiment and thereafter regularly fortnightly intervals Two monoculture treatments one receiving supplementary feed and another e r Fd receiving feed were stocked with rohu ha Among four polyculture treatments two treatments one receiving supplementary feed and another feed were stocked with rohu plus common carp and rest two one receiving supplementary feed and another feed were stocked with rohu plus Mono a h common carp | |||||||||
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