scholarly journals Characteristic Trend in Surface Undulations of Paddy Fields with Remarkably Poor Surface Drainage

2016 ◽  
Vol 35 (Special_Issue) ◽  
pp. 147-153
Author(s):  
Sho SUZUKI ◽  
Masao MAKIYAMA
Keyword(s):  
Paddy Fields ◽  
Surface Drainage ◽  
Characteristic Trend

Water management practices and SCS curve numbers of paddy fields equipped with surface drainage pipes

2012 ◽  
Vol 110 ◽  
pp. 78-83 ◽  
Author(s):  
Jae-Woon Jung ◽  
Kwang-Sik Yoon ◽  
Dong-Ho Choi ◽  
Sang-Sun Lim ◽  
Woo-Jung Choi ◽  
...  
Keyword(s):  
Water Management ◽  
Management Practices ◽  
Paddy Fields ◽  
Surface Drainage

scholarly journals Nitrogen balance in paddy fields under flowing-irrigation condition

2019 ◽  
Vol 116 (1) ◽  
pp. 19-30 ◽  
Author(s):  
Makoto Saiki ◽  
Thi Phuong Mai Nguyen ◽  
Junko Shindo ◽  
Kei Nishida
Keyword(s):  
Nitrogen Balance ◽  
Subsurface Drainage ◽  
Paddy Fields ◽  
Nitrogen Accumulation ◽  
Surface Drainage ◽  
Budget Analysis ◽  
Input And Output ◽  
Nitrogen Inputs ◽  
Nitrate And Nitrite ◽  
Soil Accumulation

Abstract Flowing irrigation which drains a large volume of water is one of agricultural techniques for ensuring rice quality. In this study, the nitrogen input and output were characterised in paddy fields under flowing irrigation based on observation in Central Japan, and the estimated nitrogen loadings were compared to the reported values in traditional paddy fields under stagnant irrigation by using budget analysis. The annual water fluxes in the studied fields were calculated to be more than ten times larger than those in traditional fields. The concentrations of most nitrogen forms in surface drainage and subsurface drainage were detected at highest level during paddling periods, while those of nitrate and nitrite in subsurface drainage increased during non-irrigation periods. The total nitrogen inputs were at upper level (236–332 kg N ha−1) of or larger (490–581 kg N ha−1) than the reported values under both flowing irrigation and stagnant irrigation, and the larger contribution of irrigation pathway was observed. Surface drainage (78.3–163.5 kg N ha−1) and transport to underground system (73.1–210.4 kg N ha−1) were significantly higher than reported values obtained from stagnant-irrigation paddy fields. The differences between input and output were thereby estimated and the large negative balance was attributed to the soil accumulation, which was distinctly detected in the field with presumably higher adsorption capacity. Therefore, assessing the effect of water flow on soil nitrogen accumulation as well as discharge is recommended by evaluating nitrogen balance in paddy field.

Mass balance analysis and water quality model development for loading estimates from paddy fields

2005 ◽  
Vol 51 (3-4) ◽  
pp. 99-105 ◽  
Author(s):  
J.-H. Jeon ◽  
C.G. Yoon ◽  
J.-H. Ham ◽  
H.-S. Hwang
Keyword(s):  
Water Quality ◽  
Mass Balance ◽  
Nutrient Loading ◽  
Model Development ◽  
Water Quality Model ◽  
Paddy Fields ◽  
Quality Model ◽  
Surface Drainage ◽  
Balance Analysis ◽  
Mass Balance Analysis

Mass balance analysis and water quality model development for paddy field were performed using field experimental data during 2001–2002. About half (47∼62%) of the total outflow was lost by surface drainage, with the remainder (490∼530 mm) occurring by evapotranspiration. Most of nutrient inflow and outflow were mediated by fertilization and plant uptake, respectively. Nutrient outflow by surface drainage runoff was substantial about 15%∼29% for T-N and 6%∼13% for T-P. However, the responses of yield and drainage outflow to fertilization were not significant in this study. A water quality model applicable to paddy fields was developed and it demonstrates good agreement with observed data. The nutrient concentration of ponded water was high by fertilization at early culture periods, so reducing surface drainage during fertilization period can reduce nutrient loading from paddy fields. Shallow irrigation, raising the weir height in diked rice fields, and minimizing forced surface drainage are suggested to reduce surface drainage outflow.

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