The role of cyanophytes in the nitrogen economy of rice fields: a review

1985 ◽  
pp. 105-110
Author(s):  
Alexis Tsangridis
Keyword(s):  
Rice Fields ◽  
Nitrogen Economy

Ecology of terrace wet rice-fish environment and role of periphyton

2011 ◽  
Vol 4 ◽  
pp. 102-111 ◽  
Author(s):  
Surjya Kumar Saikia ◽  
Debangshu Narayan Das
Keyword(s):  
Rice Fields ◽  
The North ◽  
North Eastern ◽  
Increasing Trend ◽  
The Rich ◽  
Carbon Dioxide Co2 ◽  
Rice Fish ◽  
Water Canals ◽  
Key Words Rice

The waterlogged terrace wet rice-fields of Apatani Plateau located at an altitude of 1500msl in Arunachal Pradesh of the north eastern India are stocked with fish Common carp (Cyprinus carpio L) for several decades. The fishes are not fed with supplementary feeds because of the rich organic nature of the rice-fields. The study on water and soil of these fields revealed a strong co-relation to such organic nature. The wet rice-fish integrated fields exhibited the characters of shallow wet ecosystems. The water canals traversed through the rice fields were found inundated with water up to 50m showing the nature of Deep Water Rice fields (DWR) at least for one month. Significant (p<0.001) variations of water were observed for dissolved oxygen (DO) and carbon dioxide (CO2) to diurnal and seasonal changes. Alkalinity of the fields intends to play a role towards its productivity which is otherwise played by DO in other aquatic systems. Soil nitrogen reflected a gradual increasing trend of organic nature. Role of periphyton may not be ignored to the high phosphorus level of the soil at later flood phases in these fields. Key words: Rice-fish; aquatic ecosystem; organic practice; plankton; periphyton DOI: 10.3126/jowe.v4i0.2585Journal of Wetlands Ecology, (2010) Vol. 4, pp 102-111

The role of amphibian prey in the diet and growth of giant water bug nymphs in Japanese rice fields

2007 ◽  
Vol 50 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Shin-ya Ohba ◽  
Hitoshi Miyasaka ◽  
Fusao Nakasuji
Keyword(s):  
Rice Fields

Fasciola gigantica and Fasciola hybrids in Southeast Asia.

2021 ◽  
pp. 423-460
Author(s):  
Nichola Eliza Davies Calvani ◽  
Jan Šlapeta
Keyword(s):  
Life Cycle ◽  
Southeast Asia ◽  
Smallholder Farmers ◽  
Economic Importance ◽  
Fasciola Gigantica ◽  
Rice Fields ◽  
Control Options ◽  
And Control

Abstract This book chapter describes the life cycle of F. gigantica and its differences from F. hepatica, including its economic importance and control options available, with particular emphasis on the importance of the smallholder farmers and the role of rice fields in maintaining the life cycle in Southeast Asia.

The Role of Dissolved CH4 in Soil Solution in the CH4 Emission from Water-Saving Irrigated Rice Fields

2011 ◽  
Vol 148-149 ◽  
pp. 977-982
Author(s):  
Dao Xi Li
Keyword(s):  
Soil Solution ◽  
Early Stage ◽  
Dominant Role ◽  
Water Layer ◽  
Water Saving ◽  
Rice Fields ◽  
Chromatography Method ◽  
Soil Layers ◽  
Soil Solutions

To examine how the dissolved CH4 in soil solution would affect the CH4 emission from rice field, fluxes of CH4 emission were measured by using a manually closed static chamber-gas chromatography method, and the dissolved CH4 in soil solution was obtained through shaking soil solutions, which were extracted from different paddy soil layers by a soil solution sampler with suction and pressure. The results show that the CH4 fluxes from rice fields and the concentration of dissolved CH4 in soil solution are both reduced significantly under the water-saving irrigation as compared to the traditional flooded irrigation. Under the water-saving irrigation, naturally receding water-layer during the early stage leads to an earlier peak of CH4 flux, but dramatically reduces the concentration of dissolved CH4 in soil solution. The maximum concentration is shifted to about 20-cm depth soil layers, and the relationship between CH4 emissions and dissolved CH4 in soil solution can be estimated using an exponential function of dissolved CH4 in soil solution at the depth of about 20 cm (R2＝0.89, p4 in soil solution plays a more dominant role in CH4 emission under the water-saving irrigation than that under continuously flooded irrigation.

Role of Fine Roots in the Nitrogen Economy of Sugar Beet

1987 ◽  
Vol 158 (1) ◽  
pp. 1-7 ◽  
Author(s):  
E. Steen ◽  
B. Lindén
Keyword(s):  
Sugar Beet ◽  
Fine Roots ◽  
Nitrogen Economy

scholarly journals Perlindungan Lahan Sawah Dalam Pencapaian Ketahanan Pangan Nasional

2020 ◽  
Vol 13 (2) ◽  
pp. 29-41
Author(s):  
Sri Mulyani ◽  
Aqil Teguh Fathani ◽  
Eko Priyo Purnomo
Keyword(s):  
Food Security ◽  
Qualitative Methods ◽  
Rice Field ◽  
Rice Production ◽  
Rice Fields ◽  
Toll Roads ◽  
Sustainable Food ◽  
Field Function ◽  
And Control

Abstrak. Tujuan penelitian ini melihat ketahanan pangan berkelanjutan yang merupakan suatu kewajiban dan harus dilakukan untuk menjaga ketersediaan pangan khususnya padi. Pada saat ini di Sumatera Barat sedang maraknya terjadi alih fungsi lahan lawah. Alih fungsi lahan sawah ini disebabkan oleh pembangunan infrastruktur, perumahan, jalan, jalan tol, sarana umum dan fasiltas lainnya. Metode dalam penelitian ini menggunakan metode kualitatif dengan pendekatan rasionalistik. Hasil penelitian menyebutkan dengan adanya alih fungsi lahan sawah menyebabkan luas panen terhadap padi dan jumlah produksi padi terus berkurang. Pada tahun 2018 terjadi pengurangan luas panen dan produksi padi yang sangat signifikan dari tahun sebelumnya (2017) yaitu sebesar 220 ribu ha luas panen padi dan 1.4 juta ton produksi padi. Hal ini dinilai sangat berbahaya bagi ketahanan pangan yang berkelanjutan karena jumlah penduduk terus bertambah dan juga kebutuhan terhadap pangan juga semakin meningkat sedangkan jumlah produksi justru terus berkurang. Oleh karena itu perlu adanya peran dari semua unsur untuk mengkontrol dan mengendalikan lahan sawah serta pemerintah dengan segera membuat regulasi Peraturan Daerah untuk mengatur lahan sawah agar tidak terjadi alih fungsi lahan sawah secara berkelanjutan.Protection of Rice Fields in Achieving National Food SecurityAbstract. The purpose of this research is to see sustainable food security which is an obligation and must be done to maintain food availability, especially rice. The function of paddy fields is caused by the development of infrastructure, housing, roads, toll roads, public means, and other facilities. The methods in this study used qualitative methods with a rationalistic approach. The results of the study mentioned that the Land of rice field function caused the harvest area to rice and the amount of rice production continued to decrease. In 2018 there was a reduction in the vast harvest and rice production which was significantly from the previous year which amounted to 220 thousand hectares of rice harvest and 1.4 million tonnes of rice production. This is very dangerous for sustainable food security because the population continues to grow and also the need for food is also increasing while the number of production is steadily decreasing. Therefore, it is necessary to have the role of all elements to control and control the rice fields and government by immediately make the regulation of local regulations to regulate the field of rice fields to prevent the functioning of the rice field sustainability.

scholarly journals Diversity of Parasitoid Insects (Order: Hymenoptera) in Rice Field and Vegetable Garden

BIOEDUSCIENCE ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 62-68
Author(s):  
Manap Trianto ◽  
Varsha Salsabillah
Keyword(s):  
Research Method ◽  
Rice Field ◽  
Sampling Technique ◽  
Rice Fields ◽  
Line Transect ◽  
Research Areas ◽  
Vegetable Gardens ◽  
Fishing Gears ◽  
Malaise Traps

Background: The Hymenoptera Order is one of the most dominant orders in the insect class, both in number of species and in their distribution in various habitats. The role of the Hymenoptera Order, especially parasitoids, is very important in a habitat. The purpose of this study was to determine the diversity of parasitoid insects, especially the order Hymenoptera in rice fields and vegetable gardens. Methods: This research is analytic descriptive. The research method used is a line transect using a sampling technique. The study was conducted in two research areas (rice fields and vegetable gardens) and used three fishing gears (malaise traps, buckets, and insect nets). Results: The results showed that the total number of insects caught was 5037 individuals from 10 orders and 80 family. The diversity of parasitoid insects in this study is in the rice fields H' = 1.80 (moderate diversity) and vegetable gardens H' = 2.26 (moderate diversity). Conclusions: Hymenoptera parasitoid insect diversity was highest in the vegetable garden area.

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