scholarly journals On the Mechanized Work System in Large-Scale Conversion of Adjoining Paddy Fields

1988 ◽  
Vol 23 (2) ◽  
pp. 104-110
Author(s):  
Kazuhiro MATSUMORI ◽  
Kunio SASAKI ◽  
Koki CHIBA
Keyword(s):  
Large Scale ◽  
Paddy Fields ◽  
Work System

scholarly journals Assessment of paddy fields’ damage caused by Cyclone Nargis using MODIS time-series images (2004–2013)

2020 ◽  
Author(s):  
Keisuke Omori ◽  
Toru Sakai ◽  
Jun Miyamoto ◽  
Akihiko Itou ◽  
Aung Naing Oo ◽  
...  
Keyword(s):  
Large Scale ◽  
Saline Water ◽  
Dry Season ◽  
Paddy Fields ◽  
Natural Ecosystems ◽  
Personal Property ◽  
Moderate Resolution ◽  
Moderate Resolution Imaging Spectroradiometer ◽  
Cyclone Nargis ◽  
Time Series Images

Abstract The Ayeyarwady Delta in the Bay of Bengal, the rice bowl of Myanmar, depends on natural conditions, especially rainfall. During the dry season, the delta’s coastal zone experiences saline water intrusion due to its low-lying topography. On May 2, 2008, Cyclone Nargis made landfall and crossed Ayeyarwady Region and Yangon City, affecting more than 50 townships and causing massive destruction of personal property and natural ecosystems. There is no doubt that Nargis caused an unprecedented large-scale disaster, but there is no objective method to quantify crop yield and salinity damage in the delta post-Nargis. The purpose of this study, therefore, is to clarify the changes in vegetation in paddy fields in the Ayeyarwady Delta using Moderate Resolution Imaging Spectroradiometer data pre- and post-Nargis and determine whether this method can be applied to measure crop and salinity damage. The study used daily composite data at a 250-m resolution (MOD09GQ, collection 6) from 2004 to 2013 and calculated NDVI and salinity indices smoothed by locally weighted regression (Lowess). Based on the results of our studies, NDVI peak value in 2008 was lower by 19% compared to 2007 data, and that the NDVI peak values declined for three straight years since May 2008 when Nargis struck. However, salinity damage evaluation pre- and post-Nargis (using the salinity index equation) showed that soil electrical conductivity did not tend to move up in the post-Nargis dry season (2009), indicating that the decrease in NDVI values was not due to salinity damage.

DEVELOPMENT OF MOVIES AS THE TEACHING TOOL ON THE MOVEMENT OF IRRIGATION WATER IN PADDY FIELDS MANAGED UNDER VARIOUS CULTIVATION METHODS

2015 ◽  
Vol 76 (15) ◽  
Author(s):  
Nakamura Kazumasa ◽  
Sakai Miki ◽  
Koshiyama Naoko
Keyword(s):  
Irrigation Water ◽  
Large Scale ◽  
Farm Management ◽  
Direct Seeding ◽  
Paddy Fields ◽  
Farm Households ◽  
Farm Household ◽  
Teaching Tool ◽  
Cultivation Method ◽  
Local Farmers

Hokkaido, the northern most of the four major islands of Japan, is an important rice-producing area. In Hokkaido there are some areas where the numbers of farm households are decreasing and the management scale for one farm household is increasing. In such areas, labor shortage occurs if only the conventional transplant cultivation is used. The necessity for introducing direct-seeding cultivation method has been increasing because by using this method it is possible to save labor. In some of the areas with increasing number of large-scale farm management, the farms employ large lot paddy fields and install underground irrigation facilities, which are useful in direct-seeding cultivation, to improve work efficiency. It is thought that it requires 2 to 3 years for the farmers to learn to effectively use the underground irrigation facilities because use of such facilities is a new experience for many farmers. The authors conducted observation of the groundwater level and depth of ponding in the paddy fields where the above-mentioned improvements were done, and made a movie using the obtained data. The movie is also useful for the authors in understanding the inflow and outflow of the groundwater, which are phenomena occurring underground. At a meeting of local farmers, the authors explained the movement of irrigation water by using this movie. The authors expect that the explanation using the movie will promote the farmers' understanding in effectively using the underground irrigation facilities.

scholarly journals Electricity Consumption and Operating Duration of Sensor Network in the Large-Scale Paddy Fields

2018 ◽  
Vol 27 (4) ◽  
pp. 64-74
Author(s):  
Kazutoshi Tanimoto ◽  
Manabu Horiguchi ◽  
Teruaki Nanseki ◽  
Takashi Sasaki ◽  
Dongpo Li
Keyword(s):  
Sensor Network ◽  
Large Scale ◽  
Electricity Consumption ◽  
Paddy Fields

Effect of large-scale rice-duck eco-farming on the composition and diversity of weed community in paddy fields

2010 ◽  
Vol 18 (1) ◽  
pp. 123-128
Author(s):  
Jian-Kai SHEN ◽  
Huang HUANG ◽  
Zhi-Qiang FU ◽  
Ya ZHANG ◽  
Can CHEN ◽  
...  
Keyword(s):  
Large Scale ◽  
Paddy Fields

Large-scale spatial variability of eight soil chemical properties within paddy fields

CATENA ◽  
2020 ◽  
Vol 188 ◽  
pp. 104350 ◽  
Author(s):  
Liangxia Duan ◽  
Zhenwei Li ◽  
Hongxia Xie ◽  
Zhiming Li ◽  
Liang Zhang ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Large Scale ◽  
Chemical Properties ◽  
Paddy Fields ◽  
Soil Chemical Properties
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