Clarification of adsorption and movement by predicting ammonia nitrogen concentrations in paddy percolation water |
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| Authors: | Email author" target="_blank">Masaya?IshikawaEmail author Toshio?Tabuchi Eiji?Yamaji |
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| Institution: | (1) Graduate School of Agricultural & Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, 113-8657, Tokyo, Japan,;(2) , , 4630-104, Ami-machi, Ami, Inashiki-gun, 300-0331, Ibaraki, Japan,;(3) Graduate School of Frontier Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-0033, Tokyo, Japan, |
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| Abstract: | We noted that ammonia nitrogen was not adsorbed by the cultivated layers of highly permeable paddy fields during the initial
fertilization period, but reached the lower layers relatively early. In our study, we considered an exponential equation from
an aqua-environmental perspective with the goal of obtaining good growth of rice plants in order to estimate the concentrations
and integrated volume of ammonia nitrogen accompanying paddy percolation. Using this exponential equation, we were able to
derive a relation between time and concentrations of paddy percolation water, and hypothesized that if percolation rates were
less than 10 mm/day, percolation would have no effect on rice growth, while simultaneously helping to maintain the good water
quality of the extra-paddy environment. We also clarified the differences between the potential ammonia nitrogen adsorption
volume derived from the CEC value and the integrated amount of ammonia nitrogen water in soil, and considered the causes from
the perspectives of solute movement and water movement.
Electronic Publication |
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| Keywords: | Water quality control Paddy field irrigation Percolation rate Pore volume CEC |
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