Modeling the water and nitrogen transports in a soil–paddy–atmosphere system using HYDRUS-1D and lysimeter experiment

被引:0
|
作者
Ranjeet K. Jha
Bhabagrahi Sahoo
Rabindra K. Panda
机构
[1] University of Illinois at Urbana-Champaign,Department of Agricultural and Biological Engineering
[2] Indian Institute of Technology Kharagpur,School of Water Resources
[3] Indian Institute of Technology Bhubaneswar,School of Infrastructure
[4] Indian Institute of Technology Kharagpur,Formerely, at Agricultural and Food Engineering Department
来源
Paddy and Water Environment | 2017年 / 15卷
关键词
HYDRUS-1D; Evapotranspiration; Irrigation; Leaching; Percolation; Ponding water;
D O I
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中图分类号
学科分类号
摘要
Efficient water and fertilizer use is of paramount importance both in rain-fed and irrigated rice cultivation systems to tread off between the crop water demand during the dry spell and the fertilizer leaching. This lysimeter study on paddy in a lateritic sandy loam soil of the eastern India, to simulate the water and solute transports using the HYDRUS-1D model, reveals that this model could very well simulate the soil depth-specific variations of water pressure heads and nitrogen (N) concentrations with the efficiency of >86 and 89%, respectively. The change in the level of water ponding depth did not have a significant effect on the time to peak and the temporal variability of N concentration in the bottom soil layer. The lysimeter-scale water balance analysis indicated that the average deep percolation loss and crop water use were 35.01 ± 2.03 and 39.74 ± 1.49% of the total water applied during the crop growth period, respectively. Similarly, the amount of N stored in the plant and lost through soil storage, deep percolation, and other losses (mineralization, denitrification, and gaseous N loss to the atmosphere through plant leaves) were 1.60 ± 0.16, 0.17 ± 0.04, 12.00 ± 0.48, and 86.23 ± 0.41% of the total applied nitrogen, respectively. The simulation results reveal that a constant ponding depth of 3 cm could be maintained in paddy fields to reduce the N leaching loss to 7.5 kgN/ha.
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页码:831 / 846
页数:15
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