scholarly journals Herbicide Discharge from Paddy Fields Located Around Lake Biwa Basin and Factors Affecting Herbicide Losses

2006 ◽  
Vol 29 (11) ◽  
pp. 715-721 ◽  
Author(s):  
Miki SUDO ◽  
Takeshi KAWACHI
Keyword(s):  
Lake Biwa ◽  
Paddy Fields ◽  
Factors Affecting

scholarly journals Run-off of Herbicides from Paddy Fields around the Southern Basin of Lake Biwa.

1996 ◽  
Vol 19 (7) ◽  
pp. 547-556 ◽  
Author(s):  
Yasuhiro SASAGAWA ◽  
Saburo MATSUI ◽  
Harumi YAMADA
Keyword(s):  
Lake Biwa ◽  
Paddy Fields ◽  
Southern Basin ◽  
Run Off

scholarly journals Factors Affecting the Salinity Intrusion at the Paddy Field in Thua Thien Hue Province, Vietnam

2021 ◽  
Author(s):  
Nguyen Phuc Khoa ◽  
Nguyen Thanh Dien ◽  
Nguyen Huu Ngu ◽  
Hoang Dinh Trung
Keyword(s):  
Paddy Field ◽  
Global Climate ◽  
Soil Samples ◽  
Paddy Fields ◽  
Salinity Intrusion ◽  
Factors Affecting ◽  
Shrimp Pond ◽  
The Status ◽  
Water And Soil Samples ◽  
Major Factors

Background: Several coastal regions in Vietnam have been suffered from salinity intrusion as a consequence of global climate change. However, there are limited studies on saline intrusion in Vietnam. This paper aimed to investigate the salinity intrusion of water and soil samples in paddy fields along Tam Giang lagoon, Thua Thien Hue province and clarify the factors affecting the salinity level. Methods: We measured the salinity concentrations (EC, Electrical conductivity) of water and soil samples in paddy fields at different distances (400, 600, 800, 1000 and 1200 m) from Tam Giang lagoon. The multiple regression analysis was performed to figure out the factors affecting the salinity concentrations. Result: The salinity concentrations of water were assessed as 48% high saline (10-25 dS m-1), 34% moderately saline (2-10 dS m-1), 2% slightly saline (0.7-2 dS m-1) and 15% non-saline ( less than 0.7 dS m-1). As for surface soil in paddy field, 14.3% moderately saline (4-8 dS m-1), 35.4% slightly saline (2-4 dS m-1) and 50.3% non-saline (0-2 dS m-1) were measured. A significantly positive correlation was found between salinity concentrations of water and soil (n = 175, r = 0.886, p less than 0.01). The distances from salinity sources, Tam Giang lagoon and shrimp pond, were major factors affecting the salinity concentrations. The paddy fields near Tam Giang lagoon and shrimp pond have higher salinity concentrations compared to those areas close to the residential area. The surface water in the paddy field within 1000 m from the salinity source was assessed as saline that might harm the paddy soil and rice production. The results of this study provide highly useful information for local policymakers and farmers about the status of salinity intrusion in paddy land.

scholarly journals The Determinants of Paddy Field Conversion in Timor Island, East Nusa Tenggara Province (NTT)

Agro Ekonomi ◽  
2017 ◽  
Vol 28 (2) ◽  
pp. 309
Author(s):  
Prischa Lulan ◽  
Dwidjono Hadi Darwanto ◽  
Slamet Hartono
Keyword(s):  
Paddy Field ◽  
High Growth ◽  
Least Square ◽  
Paddy Fields ◽  
Infrastructure Development ◽  
Factors Affecting ◽  
Ordinary Least Square ◽  
South Central ◽  
Building Area ◽  
Field Area

The objectives of this research are: (1) to investigate the trend of paddy fields on Timor Islandand (2) to know the determinants of the conversion of paddy fields on Timor Island. TimorIsland consists of several districts such as Kupang District, South Central Timor District(TTS), North Central Timor District (TTU), Belu District and Kupang City. In fact, theyare the main rice-producing areas in the Timor Island, so they have an important role in thesupplying sufficient for locals. However, the regions are slowly started to be converted tonon-paddy-field use such as new settlements and other infrastructure development along withthe current economic development. The basic method used in this research was descriptiveanalysis and the location of research was determined purposively because this locationwas based on the consideration that there was a high growth of non-agricultural sectors inTimor Island; making it vulnerable to the reduction of paddy field area. The data used wassecondary data (2005-2014). The results showed that (1) the trend of rice field in Timor Islandis not significant with time variable. (2) The analysis of determinants of paddy field area inTimor Island using multiple linear regression with Ordinary Least Square (OLS) methodindicated that the factors affecting the conversion of wetland in Timor Island significantlyare the variable of building area and the number of industries.

scholarly journals ANALISIS KONVERSI LAHAN SAWAH DI KOTA SOLOK

2018 ◽  
Vol 3 (1) ◽  
pp. 39
Author(s):  
. Mardianto
Keyword(s):  
Agricultural Land ◽  
Secondary Data ◽  
Simple Random Sampling ◽  
Paddy Fields ◽  
Primary Data ◽  
Survey Method ◽  
Small Scale ◽  
Land Conversion ◽  
Internal Factor ◽  
Factors Affecting

Agricultural land conversion occurs mostly in big cities in Indonesia and also occurs in small villages and towns on a small scale but not much has been done by the study. This study was linked to detect factors affecting land conversion in Kota Solok. This research was conducted by survey method. Sampling is done by simple random sampling with balanced amount. The data collected in this study includes primary data and secondary data. The analysis is done by description using percentage of respondent's level of achievement (tcr). The result of the analysis shows that the conversion of paddy fields in Solok City is mostly done by individual buyers, the internal factor which has the greatest effect on the conversion of paddy fields in Solok City is the economic condition, while the external factor is caused by the population growth and the policy caused by the weakness of policy control which government apparatus.

scholarly journals Factors Affecting Herbicidal Activity of Imazosulfuron against Weeds in Paddy Fields.

1998 ◽  
Vol 43 (3) ◽  
pp. 195-202 ◽  
Author(s):  
Yasushi Tanaka ◽  
Takahiro Yamawaki ◽  
Harutoshi Yoshikawa
Keyword(s):  
Herbicidal Activity ◽  
Paddy Fields ◽  
Factors Affecting

A study on pollutant loads from the forest and rice paddy fields

1996 ◽  
Vol 33 (4-5) ◽  
pp. 159-165 ◽  
Author(s):  
Osami Kawara ◽  
Katsuya Hirayma ◽  
Takao Kunimatsu
Keyword(s):  
Water Quality ◽  
Lake Biwa ◽  
Rice Paddy ◽  
River Basins ◽  
Point Sources ◽  
Paddy Fields ◽  
Pollutant Loads ◽  
Rice Paddy Fields ◽  
Load Generation

The eutrophication of Lake Biwa, which is the largest lake in Japan and one of the most important fresh water resources, has been warned since 1960s. In order to improve the water quality of the lake, it is inevitable to reduce the pollutant loads from the river basins. The Hino river and the Soma river basins are considered in the present study and models which predict the influence of pollutant load generation on the discharged pollutant loads through the rivers. These basins mainly consist of forests and rice paddy fields. The identified models reproduce the observed water quality relatively well. Evaluation of loads from point-sources and non-point sources indicates that the loads from non-point sources occupy the most of pollutant loads from the basins. Especially, the loads from rice paddy fields occupy most of the pollutant loads from the basisn. Therefore, controlling non-point source pollutant loads in the Hino and Soma river basins is an important step in checking the eutrophication of Lake Biwa.

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