scholarly journals Studies on Sympetrum frequens (Odonata : Libellulidae) nymphs as natural enemies of the mosquito larvae, Anopheles sinensis, in rice fields : 4 Prey-predator relationship in the rice field areas

1990 ◽  
Vol 41 (3) ◽  
pp. 265-272 ◽  
Author(s):  
Kenichi URABE ◽  
Takaya IKEMOTO ◽  
Shinichi TAKEI
Keyword(s):  
Natural Enemies ◽  
Rice Field ◽  
Rice Fields ◽  
Anopheles Sinensis ◽  
Mosquito Larvae ◽  
Sympetrum Frequens

scholarly journals Minimal tillage and intermittent flooding farming systems show a potential reduction in the proliferation of Anopheles mosquito larvae in a rice field in Malanville, Northern Benin

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Innocent Djègbè ◽  
Merdie Zinsou ◽  
Edia Flavien Dovonou ◽  
Geneviève Tchigossou ◽  
Murielle Soglo ◽  
...  
Keyword(s):  
Water Management ◽  
Malaria Transmission ◽  
Management System ◽  
Rice Field ◽  
Rice Fields ◽  
Rice Cultivation ◽  
Mosquito Larvae ◽  
Water Management System ◽  
Deep Tillage ◽  
Continuous Flooding

Abstract Background Irrigation systems have been identified as one of the factors promoting malaria disease around agricultural farms in sub-Saharan Africa. However, if improved water management strategy is adopted during rice cultivation, it may help to reduce malaria cases among human population living around rice fields. This study aimed to assess the impact of the different irrigation practices on malaria transmission, as well as to evaluate the water management system that will best mitigate malaria transmission in Malanville, Benin. Methods Knowledge, Attitude and Practice (KAP) study was conducted on 104 households staying on and around the rice fields in Malanville. The study focused on the frequency of mosquito bites and preventive measures against malaria as well as soil preparation and rice planting methods. Mosquito larvae density was assessed in different water management system: continuous flooding (CF) or intermittent flooding (IF), deep tillage (DT) or minimal tillage (MT) and normal levelling (NL) or abnormal levelling (AL) in an experimental hut set-up. Larvae were collected using dipping methods and their density was determined. Results Three tillage systems, which include the use of tiller, plow and hoe, were identified on the rice field. Continuous flooding was the only irrigation system used by farmers. Retrospective data from Malanville Health Centre revealed higher malaria cases during rice production season, which was also confirmed by field participants. The density of Anopheles larvae was reduced by 80.8%, 30.8% and 40.7% (P = 0.000) during transplanting, tillering and maturation periods, respectively with intermittent flooding compared to continuous flooding. In addition, a clear reduction of larva density was observed with both intermittent flooding systems applied to minimal tillage (MT + IF + NL) and intermittent flooding applied to deep tillage (DT + IF + AL), showing that intermittent flooding could reduce the abundance of malaria vector in rice fields. Conclusion Recommending intermittent flooding technology for rice cultivation may not only be useful for water management but could also be an intentional strategy to control mosquitoes vector-borne diseases around rice farms.

Integration of the rice field design software with AutoCAD Сivil 3D

2021 ◽  
pp. 347-351
Author(s):  
E.E. Dmitrieva ◽  
E.V. Kalinova
Keyword(s):  
Rice Field ◽  
Field Model ◽  
Rice Fields ◽  
Engineering System ◽  
Design Software

The article discusses the use of AutoCAD Civil 3D engineering system with the software for rice fields designing. The article contains the examples of graphic materials (rice field model) created in AutoCAD Civil 3D based on the design results in RIS software.

scholarly journals Polarisasi etnis dan potensi konflik dalam kebijakan pencetakan sawah baru: Sebuah kajian kepustakaan

2021 ◽  
Vol 16 (1) ◽  
pp. 81
Author(s):  
Dwi Wulan Pujiriyani
Keyword(s):  
Literature Review ◽  
Ethnic Groups ◽  
Ethnic Conflict ◽  
Rice Field ◽  
Aging Population ◽  
Rice Fields ◽  
Ethnic Composition ◽  
Productive Labor ◽  
Potential Problems ◽  
Future Potential

This study aims to analyse the implementation of new rice field plan  policies in Indonesia and their impacts on population and ethnic composition in new rice field locations. This research is conducted by applying a literature review method. It is shown that the implementation of the policies had two major implications. Firstly, it creates assimilation opportunities through collaboration between ethnic migrants and local ethnic groups to work on or cultivate new rice fields. Secondly, the great flows of transmigrants that move to the new rice field locations trigger ethnic polarization, which is prone to cause inter-ethnic conflict. In the future, potential problems associated with the provision of new rice fields are available are the risk of having aging population. The aging population indicates a decrease in productive labor that may also affect on decreasing attractiveness of the rice fields to the younger generation. This situation can lead to the re-involvement of older generation in managing the new rice fields. However, it can raise a new concern on their ability to improve the rice fields’ productivity or, even worse, the new rice fields might be neglected or be sold. 

scholarly journals Manipulation of Chemical Properties in Soil under Wetland Rice through Industrial Effluents

2019 ◽  
pp. 1-15
Author(s):  
Md. Rafiqul Islam ◽  
Golam Kibria Muhammad Mustafizur Rahman ◽  
Md. Abu Saleque
Keyword(s):  
Electrical Conductivity ◽  
Organic Carbon ◽  
Carbon Content ◽  
Rice Field ◽  
Soil Depth ◽  
Chemical Properties ◽  
Industrial Effluents ◽  
Rice Fields ◽  
Organic Carbon Content ◽  
Irrigated Rice

A laboratory experiment was conducted in Soil Science Division of Bangladesh Rice Research Institute (BRRI) during 2010-11 aimed to determine the effects of different industrial effluents on some soil chemical properties under long-term industrial wastewater irrigated rice field. Effluents irrigation created some differences in soil pH, electrical conductivity and organic carbon. The pH in all soil depth was higher with wastewater irrigated rice field. Irrigation with wastewater increased in all the effluents irrigated rice fields; the electrical conductivity (EC) was remarkable higher with  all soil depth than the control field. In all the rice fields soil (Control + effluents irrigated fields), the organic carbon content (%) started to decrease sharply with the increase in soil depth. Organic carbon content was slightly higher with wastewater irrigated rice soils. Exchangeable cations (Ca, Mg, K and Na), trace elements (Zn, Fe, Mn and Cu) and heavy metals (Pb, Cd, Cr and Ni) were increased through irrigation with wastewater in rice–rice cropping pattern.

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