Effects of different fertilization and feeding regimes on the production of integrated farming of rice and prawn Macrobrachium rosenbergii (De Man)

Abstract

An experiment was conducted in rice ¢eld plots each of 30 m 2 to determine the appropriate combination of feeding and fertilization regimes for the giant freshwater prawn Macrobrachium rosenbergii (De Man, 1879) cultured along with rice in rice ¢elds. There were four treatments: rice culture only with regular fertilization (A, control); rice^prawn integrated culture with regular fertilization (B); rice^prawn integrated culture with basal fertilization and commercial feed (C) and rice^prawn integrated culture with regular fertilization and commercial feed (D). Juvenile prawns of 1.5-g size were stocked on the third day after rice transplantation at a density of 2 prawns m À 2 and fed twice daily at 5% reducing to 2% of body weight during the experiment. The rice yield in treatment D (0.42 kg m À 2 ) was signi¢cantly higher than that in other treatments (0.34, 0.36, 0.34 kg m À 2 in treatments A, B, C respectively). Prawns grew signi¢cantly faster (Po0.05) in treatments C and D (23.8 AE 0.9 and 22.0 AE 1.7 g prawn À1 respectively) than in treatment B (14.7 AE 1.6 g prawn À1 ). Prawn production in treatment C (347 AE 13 kg ha À1 crop À1 ) was sig-ni¢cantly (Po0.05) higher than that (234 AE 30 kg ha À1 crop À1 ) in treatment B, while in treatment D (296 AE 53 kg ha À1 crop À1 ) it was not signi¢cantly di¡erent from that in treatments B and C (P40.05). Treatment C gave the highest economic returns among all treatments, followed by treatments D and B, indicating that the combination of basal fertilization and commercial feed is the most appropriate nutrient input regime for the rice^prawn integrated culture system.

Chinese Consumer Quality Perception and Preference of Traditional Sustainable Rice Produced by the Integrated Rice–Fish System

“…Rice-fish systems allow farmers to produce fish and rice from the same field, and this doesn't reduce rice yields. The integrated rice-fish farming can use fish to improve soil fertility, and many reports also confirm that integrated rice-fish farming is ecologically sound [22,23]. In such fields where fish culture coexists, the paddy grows better, with higher branches, longer panicles, higher effective tillering rate, and more grains per tiller.…”

Risk assessment of pesticides used in rice-prawn concurrent systems in Bangladesh

“…Pesticides applied in rice-prawn concurrent systems may constitute a potential toxicological risk for the aquatic organisms that are cultured in the gher as well as for the maintenance of the aquatic communities that support the aquatic ecosystem of the gher, and herewith can make the whole system less profitable as it may eradicate organisms that are a food source for the cultured prawns (Huy Giap et al, 2005). Furthermore, pesticides applied by farmers with poor education on safe pesticide use practices Fig.…”

“…Rice-prawn farming is considered as an effective method of integrated agriculture-aquaculture (Ahmed et al, 2008) which maximizes land and water utilization, while providing excellent opportunities for nutrient re-utilization within the system (Kunda et al, 2008). In rice-prawn concurrent systems, the rice crop attracts a series of insect species that constitute the natural food source for the cultured fish and prawns, while the nutrient-rich waste released from the cultivated aquatic animals can be effectively used as fertilizer for rice farming (Huy Giap et al, 2005).…”

Effects of insecticides on aquatic ecosystems in Bangladesh

“…Pesticides applied in rice-prawn concurrent systems may constitute a potential toxicological risk for the aquatic organisms that are cultured in the gher as well as for the maintenance of the aquatic communities that support the aquatic ecosystem of the gher, and herewith can make the whole system less profitable as it may eradicate organisms that are a food source for the cultured prawns (Huy Giap et al, 2005). Furthermore, pesticides applied by farmers with poor education on safe pesticide use practices could result in human health hazards, including risks of acute intoxication and/or other diseases e.g.…”

“…Riceprawn farming is considered as an effective method of integrated agriculture-aquaculture (Ahmed et al, 2008) which maximizes land and water utilization, while providing excellent opportunities for nutrient re-utilization within the system (Kunda et al, 2008). In rice-prawn concurrent systems, the rice crop attracts a series of insect species that constitute the natural food source for the cultured fish and prawns, while the nutrient-rich waste released from the cultivated aquatic animals can be effectively used as fertilizer for rice farming (Huy Giap et al, 2005). …”