Evaluation of N and P mass balance in paddy rice culture along Kahokugata Lake, Japan, to assess potential lake pollution

2008 ◽  
Vol 6 (4) ◽  
pp. 355-362 ◽  
Author(s):  
Toshisuke Maruyama ◽  
Iwao Hashimoto ◽  
Kazuo Murashima ◽  
Hiroshi Takimoto
Keyword(s):  
Mass Balance ◽  
Paddy Rice ◽  
Rice Culture ◽  
Paddy Rice Culture

Mass balance analysis in Korean paddy rice culture

2003 ◽  
Vol 1 (2) ◽  
pp. 99-106 ◽  
Author(s):  
Chun G. Yoon ◽  
Jong-Hwa Ham ◽  
Ji-Hong Jeon
Keyword(s):  
Mass Balance ◽  
Paddy Rice ◽  
Rice Culture ◽  
Balance Analysis ◽  
Paddy Rice Culture ◽  
Mass Balance Analysis

scholarly journals Mechanized paddy Rice Culture and its Labour-Saving Effect in Aomori Prefecture

1966 ◽  
Vol 1966 (2) ◽  
pp. 71-75
Author(s):  
Masao NAGANUMA ◽  
Toshimitsu KANAZAWA ◽  
Junichi KAMIDE ◽  
Rokujiro YAGIHASHI
Keyword(s):  
Paddy Rice ◽  
Rice Culture ◽  
Paddy Rice Culture ◽  
Saving Effect ◽  
Aomori Prefecture

FEASIBILITY STUDY OF TREATED SEWAGE IRRIGATION ON PADDY RICE CULTURE

2001 ◽  
Vol 36 (5) ◽  
pp. 807-818 ◽  
Author(s):  
Soon-Kuk Kwun ◽  
Chun-Gyeong Yoon ◽  
Ill-Min Chung
Keyword(s):  
Feasibility Study ◽  
Paddy Rice ◽  
Sewage Irrigation ◽  
Rice Culture ◽  
Treated Sewage ◽  
Paddy Rice Culture

Effects of treated sewage irrigation on paddy rice culture and its soil

2001 ◽  
Vol 50 (3) ◽  
pp. 227-236 ◽  
Author(s):  
Chun G. Yoon ◽  
Soon K. Kwun ◽  
Jong H. Ham
Keyword(s):  
Paddy Rice ◽  
Sewage Irrigation ◽  
Rice Culture ◽  
Treated Sewage ◽  
Paddy Rice Culture

scholarly journals A Study on the Applicability of HSPF Paddy-RCH for Calculating the Reduction of Agricultural Non-point Pollutants

2020 ◽  
Vol 42 (12) ◽  
pp. 593-602
Author(s):  
Shin Hye Jung ◽  
Han-Pil Rhee ◽  
Ha Sun Hwang ◽  
Chun Gyeong Yoon
Keyword(s):  
Water Quality ◽  
South Korea ◽  
Mass Balance ◽  
Flow Rate ◽  
Paddy Field ◽  
Rice Field ◽  
Paddy Rice ◽  
Paddy Fields ◽  
Small Scale ◽  
Paddy Rice Field

Objectives:Non-point source pollution (NPS) reduction has been considered as the first priority in South Korea to achieve acceptable water quality. Among many NPS pollutions, agricultural NPS is one of the major NPS contributor due to its vast area. However, agricultural NPS characterization has not been successful because agricultural NPS has inconsistent water and mass balances, thus has lacking NPS reduction measures. This study assesses applicability of HSPF Paddy-RCH method to estimate agricultural NPS loads in paddy rice field.Methods:HSPF Paddy-RCH method was developed to simulate water and mass balance in paddy rice field(s). Applicability of the developed method was tested in Gyeseongcheon watershed in Nakdong River basin, South Korea. The study area was selected because there is no other major pollutant source except the paddy fields, but has simple drainage system. HSPF Paddy-RCH method was calibrated in control paddy field with conventional fertilizing condition and applied to two small scale paddy fields (89% and 76% fertilizing condition). The calibrated HSPF Paddy-RCH method was then tested in small watershed (subbasin) including small paddy fields applied earlier for applicability study of watershed scale.Results and Discussion:Calibrated HSPF Paddy-RCH method well represented observed flow rates (R2=0.825) and water-quality (BOD, T-N, T-P, relative differences [%diff]<7.52%). Water-quality parameters for the control paddy field showed slower decaying rate than river and stream. The calibrated HSPF Paddy-RCH well represented water and mass balance for the small scale paddy fields with varying fertilizing condition (R2>0.689 for flow rate, %diff<12.20% for water quality), as well as for the small scale watershed with large scale paddy fields (R2>0.693 for flow rate, %diff<19.29% for water quality) could promise.Conclusions:This applicability study results would suggest that HSPF Paddy-RCH method is a feasible tool to quantify agricultural NPS pollution and to develop reduction measured for paddy rice field.

MASS BALANCE IN LATTICE BOLTZMANN METHOD WITH DIRICHLET VELOCITY BOUNDARY CONDITION

2017 ◽  
Vol 48 (9) ◽  
pp. 811-826
Author(s):  
Zheng Li ◽  
Mo Yang ◽  
Ya-Ling He ◽  
Yuwen Zhang
Keyword(s):  
Boundary Condition ◽  
Lattice Boltzmann Method ◽  
Mass Balance ◽  
Lattice Boltzmann ◽  
Boltzmann Method
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