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Impact of rice–fish–prawn culture on rice-field ecology and productivity

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Title Impact of rice–fish–prawn culture on rice-field ecology and productivity
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Creator RAJEEB K MOHANTY
A K THAKUR
S GHOSH
D U PATIL
 
Subject Feed intake pattern
Rice-field ecology
Rice–fish–prawn culture
Water productivity
Yield
 
Description Not Available
An on-farm experiment was carried out during 2005–07 to study the impact of fish and prawn rearing on rice-field ecology and productivity in rice–fish–prawn system. Water pH, total alkalinity, total suspended solid, plankton and chlorophyll-a were significantly lower in the rice mono crop than the rice–fish–prawn system, where supplemental feed was provided. However increased phytoplankton and chlorophyll-a concentration in the rice–fish–prawn system did not help in maintaining higher dissolved oxygen levels compared to rice mono-crop probably due to decreased autotrophic/increased heterotrophic activity. Gut content analysis of the cultured species indicated plenty availability of planktonic, periphytic and benthic food to fish and prawn in the rice-field (22.7–48.9%), that reduce the supplemental feed input. Rice grain yield of 3.04 tonnes/ha in the rice–fish–prawn system was 16.9% higher than the rice mono-crop. In rice–fish–prawn system, when 50% area is devoted for fish and prawn culture, the net return enhanced by 23-folds in comparison to rice monocrop. Significantly higher net return of Rs 79 585/ha, net water productivity of Rs 7.66/m3 and the higher ratio of the output value to the cost of cultivation (1.6) in the rice–fish–prawn system infers that, rice–fish–prawn culture is more beneficial can be adopted and expanded in lowland/ waterlogged areas.
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Date 2018-07-28T04:14:41Z
2018-07-28T04:14:41Z
2010-07-01
 
Type Research Paper
 
Identifier 5
0019-5022
http://krishi.icar.gov.in/jspui/handle/123456789/6337
 
Language English
 
Relation Not Available;
 
Publisher Not Available