Satellite-based investigation of flood-affected rice cultivation areas in Chao Phraya River Delta, Thailand

2013 ◽  
Vol 86 ◽  
pp. 77-88 ◽  
Author(s):  
N.T. Son ◽  
C.F. Chen ◽  
C.R. Chen ◽  
L.Y. Chang
Keyword(s):  
River Delta ◽  
Rice Cultivation ◽  
Chao Phraya River

scholarly journals An assessment of irrigated rice cultivation with different crop establishment practices in Vietnam

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Van-Hung Nguyen ◽  
Alexander M. Stuart ◽  
Thi-My-Phung Nguyen ◽  
Thi-Minh-Hieu Pham ◽  
Ngoc-Phuong-Thanh Nguyen ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Field Trials ◽  
Rice Production ◽  
River Delta ◽  
Rice Cultivation ◽  
Mekong River ◽  
Net Energy ◽  
Net Income ◽  
Mekong River Delta ◽  
Crop Establishment

AbstractOveruse of seed and chemical inputs is a major constraint for sustainable rice production in Vietnam. In this study, two seasons of field trials were conducted to compare different crop establishment practices for rice production in the Mekong River Delta using environmental and economic sustainability performance indicators. The indicators including energy efficiency, agronomic use efficiency, net income, and greenhouse gas emissions (GHGEs) were quantified based on four treatments including manual broadcast-seeding, blower seeding, drum seeding, and mechanized transplanting. Across the four treatments, yields ranged from 7.3–7.5 Mg ha−1 and 6.2–6.8 Mg ha−1 in the Winter-Spring (WS) and Summer-Autumn (SA) seasons, respectively. In comparison with direct seeding methods, mechanized transplanting decreased the seed rate by 40%. It also led to a 30–40% reduction in pesticide use during the main crop season (WS). Mechanized transplanting required higher inputs, including machine depreciation and fuel consumption, but its net energy balance, net income and GHGE were at a similar level as the other non-mechanized planting practices. Mechanized transplanting is a technology package that should be promoted to improve the economic and environmental sustainability of lowland rice cultivation in the Mekong River Delta of Vietnam.

Erosion and accretion processes in a muddy dissipative coast, the Chao Phraya River delta, Thailand

2010 ◽  
Vol 35 (14) ◽  
pp. 1701-1711 ◽  
Author(s):  
Katsuto Uehara ◽  
Pramot Sojisuporn ◽  
Yoshiki Saito ◽  
Thanawat Jarupongsakul
Keyword(s):  
River Delta ◽  
Erosion And Accretion ◽  
Chao Phraya River

scholarly journals Rice-planted area extraction by time series analysis of ENVISAT ASAR WS data using a phenology-based classification approach: A case study for Red River Delta, Vietnam

2015 ◽  
Vol XL-7/W3 ◽  
pp. 77-83 ◽  
Author(s):  
D. Nguyen ◽  
W. Wagner ◽  
V. Naeimi ◽  
S. Cao
Keyword(s):  
Time Series ◽  
Supervised Classification ◽  
Incidence Angle ◽  
Rice Fields ◽  
River Delta ◽  
Rice Cultivation ◽  
Red River ◽  
Rice Crop ◽  
Red River Delta ◽  
Classification Approach

Recent studies have shown the potential of Synthetic Aperture Radars (SAR) for mapping of rice fields and some other vegetation types. For rice field classification, conventional classification techniques have been mostly used including manual threshold-based and supervised classification approaches. The challenge of the threshold-based approach is to find acceptable thresholds to be used for each individual SAR scene. Furthermore, the influence of local incidence angle on backscatter hinders using a single threshold for the entire scene. Similarly, the supervised classification approach requires different training samples for different output classes. In case of rice crop, supervised classification using temporal data requires different training datasets to perform classification procedure which might lead to inconsistent mapping results. In this study we present an automatic method to identify rice crop areas by extracting phonological parameters after performing an empirical regression-based normalization of the backscatter to a reference incidence angle. The method is evaluated in the Red River Delta (RRD), Vietnam using the time series of ENVISAT Advanced SAR (ASAR) Wide Swath (WS) mode data. The results of rice mapping algorithm compared to the reference data indicate the Completeness (User accuracy), Correctness (Producer accuracy) and Quality (Overall accuracies) of 88.8%, 92.5 % and 83.9 % respectively. The total area of the classified rice fields corresponds to the total rice cultivation areas given by the official statistics in Vietnam (R²  0.96). The results indicates that applying a phenology-based classification approach using backscatter time series in optimal incidence angle normalization can achieve high classification accuracies. In addition, the method is not only useful for large scale early mapping of rice fields in the Red River Delta using the current and future C-band Sentinal-1A&B backscatter data but also might be applied for other rice cultivation areas.

The Neolithic Revolution in the South ca. 7/6000–2000 bce: Majiabang, Hemudu, Daxi, and Songze Cultures

2020 ◽  
pp. 52-72
Author(s):  
Xiangming Fang
Keyword(s):  
River Delta ◽  
Rice Cultivation ◽  
The South ◽  
Wood Technology ◽  
Neolithic Revolution ◽  
Yangzi River

This chapter analyzes the Neolithic revolution in the south from ca. 7/6000–2000 bce. The cultures it discusses include the Majiabang, Hemudu, Daxi, and Songze, primarily located in the middle and lower reaches of the Yangzi River Delta. Key phenomena explored in this chapter include rice cultivation; use of the stone plowshare; advanced wood technology; column architecture; surrounding dry trench settlement; high man-made platform altars; advanced crafts of painting, sculpting, and engraving; cosmological double bird symbolization (images of moonlight and sunlight); and other light and fertility symbols (rotating sun symbol with birds).

scholarly journals An Assessment of Irrigated Rice Cultivation With Different Crop Establishment Practices in Vietnam

2021 ◽  
Author(s):  
Van Hung Nguyen ◽  
Alex Stuart ◽  
Thi My Phung Nguyen ◽  
Thi Minh Hieu Pham ◽  
Ngoc Phuong Thanh Nguyen ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Field Trials ◽  
Rice Production ◽  
River Delta ◽  
Rice Cultivation ◽  
Mekong River ◽  
Net Energy ◽  
Net Income ◽  
Mekong River Delta ◽  
Crop Establishment

Abstract Overuse of seed and chemical inputs is a major constraint for sustainable rice production in Vietnam. In this study, two seasons of field trials were conducted to compare different crop establishment practices for rice production in the Mekong River Delta using environmental and economic sustainability performance indicators. The indicators including energy efficiency, agronomic use efficiency, net income, and greenhouse gas emissions (GHGEs) were quantified based on four treatments including manual broadcast-seeding, blower seeding, drum seeding, and mechanized transplanting. Across the four treatments, yields ranged from 7.3–7.5 Mg ha−1 and 6.2–6.8 Mg ha−1 in the Winter-Spring (WS) and Summer-Autumn (SA) seasons, respectively. In comparison with direct seeding methods, mechanized transplanting decreased the seed rate by 40%. It also led to a 30–40% reduction in pesticide use during the main crop season (WS). Mechanized transplanting required higher inputs, including machine depreciation and fuel consumption, but its net energy balance, net income and GHGE were at a similar level as the other non-mechanized planting practices. Mechanized transplanting is a technology package that should be promoted to improve the economic and environmental sustainability of lowland rice cultivation in the Mekong River Delta of Vietnam.

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