scholarly journals Modeling biomass and yield production based on nitrogen accumulation in soybean grown in upland fields converted from paddy fields in Japan

2021 ◽  
pp. 1-14
Author(s):  
Satoshi Nakano ◽  
Koki Homma ◽  
Tatsuhiko Shiraiwa
Keyword(s):  
Paddy Fields ◽  
Nitrogen Accumulation ◽  
Yield Production

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.

Nitrogen accumulation and changes in natural15N abundance in the tissues of legumes with emphasis on N2fixation by stem-nodulating plants in upland and paddy fields

1991 ◽  
Vol 37 (1) ◽  
pp. 75-82 ◽  
Author(s):  
Tadakatsu Yoneyama ◽  
Takeshi Uchiyama ◽  
Hideo Sasakawa ◽  
Takuma Gamo ◽  
Jagdish K. Ladha ◽  
...  
Keyword(s):  
Paddy Fields ◽  
Nitrogen Accumulation ◽  
Natural15n Abundance

Effects of Soil Alkaline Hydrolyzed Nitrogen Concentration on Biomass and Nitrogen Accumulation Eigenvalues of Cotton after Initial Flowering

2013 ◽  
Vol 39 (7) ◽  
pp. 1257
Author(s):  
Wei-Chao SONG ◽  
Chun-Yu LIU ◽  
Jiao XU ◽  
Ning SUI ◽  
Bing-Lin CHEN ◽  
...  
Keyword(s):  
Nitrogen Concentration ◽  
Nitrogen Accumulation

scholarly journals Response of Vertical Migration and Leaching of Nitrogen in Percolation Water of Paddy Fields under Water-Saving Irrigation and Straw Return Conditions

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 868 ◽  
Author(s):  
Chengxin Zheng ◽  
Zhanyu Zhang ◽  
Yunyu Wu ◽  
Richwell Mwiya
Keyword(s):  
Vertical Migration ◽  
Growth Stage ◽  
Nitrogen Leaching ◽  
Water Saving ◽  
Paddy Fields ◽  
N Leaching ◽  
Leaching Losses ◽  
Leaching Loss ◽  
Straw Return ◽  
Percolation Water

The use of water-saving irrigation techniques has been encouraged in rice fields in response to irrigation water scarcity. Straw return is an important means of straw reuse. However, the environmental impact of this technology, e.g., nitrogen leaching loss, must be further explored. A two-year (2017–2018) experiment was conducted to investigate the vertical migration and leaching of nitrogen in paddy fields under water-saving and straw return conditions. Treatments included traditional flood irrigation (FI) and two water-saving irrigation regimes: rain-catching and controlled irrigation (RC-CI) and drought planting with straw mulching (DP-SM). RC-CI and DP-SM both significantly decreased the irrigation input compared with FI. RC-CI increased the rice yield by 8.23%~12.26%, while DP-SM decreased it by 8.98%~15.24% compared with FI. NH4+-N was the main form of the nitrogen leaching loss in percolation water, occupying 49.06%~50.97% of TN leaching losses. The NH4+-N and TN concentration showed a decreasing trend from top to bottom in soil water of 0~54 cm depth, while the concentration of NO3−-N presented the opposite behavior. The TN and NH4+-N concentrations in percolation water of RC-CI during most of the rice growth stage were the highest among treatments in both years, and DP-SM showed a trend of decreasing TN and NH4+-N concentrations. The NO3−-N concentrations in percolation water showed a regular pattern of DP-SM > RC-CI > FI during most of the rice growth stage. RC-CI and DP-SM remarkably reduced the amount of N leaching losses compared to FI as a result of the significant decrease of percolation water volumes. The tillering and jointing-booting stages were the two critical periods of N leaching (accounted for 74.85%~86.26% of N leaching losses). Great promotion potential of RC-CI and DP-SM exists in the lower reaches of the Yangtze River, China, and DP-SM needs to be further optimized.

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