The runoff of suspended, substances, nitrogen, and phosphorus by enforced draining during the ploughing season experiments in paddy fields

Yoshihiro Yamada; Akitake Igeta; Sachi Nakashima; Yugo Mito; Takako Ogasahara; Sayaka Wada; Tomohiko Ohno; Atsushi Ueda; Fujio Hyodo; Miho Imada; Shigeo Yachi; Ichiro Tayasu; Syoichi Fukuhara; Takuya Tanaka; Eitaro Wada

doi:10.3739/rikusui.67.105

The runoff of suspended, substances, nitrogen, and phosphorus by enforced draining during the ploughing season experiments in paddy fields

Yoshihiro Yamada, Akitake Igeta, Sachi Nakashima, Yugo Mito, Takako Ogasahara, Sayaka Wada, Tomohiko Ohno, Atsushi Ueda, Fujio Hyodo, Miho Imada, Shigeo Yachi, Ichiro Tayasu, Syoichi Fukuhara, Takuya Tanaka, Eitaro Wada

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

The runoff of suspended substances (SS), nitrogen, and phosphorus by enforced draining during the ploughing season was calculated from experiments in two paddy fields. The area of a paddy field was 3000m². The total fluxes were 33 kg (SS), 85 g (total-N), and 46 g (total-P) in Field A, with a small decrease in water levels (8mm), 110kg (SS), 589 g (total-N), and146 g (total-P) in Field B with a major decrease in water levels (72mm). Furthermore, the nitrogen/ phosphorus ratios (mol ratios) of the waste water by the enforced draining were 4.1 (Field A) and 8.8 (Field B). In comparison with N/P of the phytoplankton (16), it was found that the phosphorus flowed out efficiently with the enforced draining. Increasing the supply of the phosphorus to Lake Biwa is not desirable in view of the current problems of eutrophication. The careless water management of paddy fields was a crucial factor in any plan to improve the water quality of Lake Biwa.

Original language	English
Pages (from-to)	105-112
Number of pages	8
Journal	Japanese Journal of Limnology
Volume	67
Issue number	2
DOIs	https://doi.org/10.3739/rikusui.67.105
Publication status	Published - Aug 2006
Externally published	Yes

Keywords

Enforced draining
Lake Biwa
Nitrogen
Paddy field
Phosphorus
SS

ASJC Scopus subject areas

Aquatic Science
Ecology
Water Science and Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.3739/rikusui.67.105

Cite this

Yamada, Y., Igeta, A., Nakashima, S., Mito, Y., Ogasahara, T., Wada, S., Ohno, T., Ueda, A., Hyodo, F., Imada, M., Yachi, S., Tayasu, I., Fukuhara, S., Tanaka, T., & Wada, E. (2006). The runoff of suspended, substances, nitrogen, and phosphorus by enforced draining during the ploughing season experiments in paddy fields. Japanese Journal of Limnology, 67(2), 105-112. https://doi.org/10.3739/rikusui.67.105

Yamada, Y, Igeta, A, Nakashima, S, Mito, Y, Ogasahara, T, Wada, S, Ohno, T, Ueda, A, Hyodo, F, Imada, M, Yachi, S, Tayasu, I, Fukuhara, S, Tanaka, T & Wada, E 2006, 'The runoff of suspended, substances, nitrogen, and phosphorus by enforced draining during the ploughing season experiments in paddy fields', Japanese Journal of Limnology, vol. 67, no. 2, pp. 105-112. https://doi.org/10.3739/rikusui.67.105

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abstract = "The runoff of suspended substances (SS), nitrogen, and phosphorus by enforced draining during the ploughing season was calculated from experiments in two paddy fields. The area of a paddy field was 3000m2. The total fluxes were 33 kg (SS), 85 g (total-N), and 46 g (total-P) in Field A, with a small decrease in water levels (8mm), 110kg (SS), 589 g (total-N), and146 g (total-P) in Field B with a major decrease in water levels (72mm). Furthermore, the nitrogen/ phosphorus ratios (mol ratios) of the waste water by the enforced draining were 4.1 (Field A) and 8.8 (Field B). In comparison with N/P of the phytoplankton (16), it was found that the phosphorus flowed out efficiently with the enforced draining. Increasing the supply of the phosphorus to Lake Biwa is not desirable in view of the current problems of eutrophication. The careless water management of paddy fields was a crucial factor in any plan to improve the water quality of Lake Biwa.",

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T1 - The runoff of suspended, substances, nitrogen, and phosphorus by enforced draining during the ploughing season experiments in paddy fields

AU - Yamada, Yoshihiro

AU - Igeta, Akitake

AU - Nakashima, Sachi

AU - Mito, Yugo

AU - Ogasahara, Takako

AU - Wada, Sayaka

AU - Ohno, Tomohiko

AU - Ueda, Atsushi

AU - Hyodo, Fujio

AU - Imada, Miho

AU - Yachi, Shigeo

AU - Tayasu, Ichiro

AU - Fukuhara, Syoichi

AU - Tanaka, Takuya

AU - Wada, Eitaro

PY - 2006/8

Y1 - 2006/8

N2 - The runoff of suspended substances (SS), nitrogen, and phosphorus by enforced draining during the ploughing season was calculated from experiments in two paddy fields. The area of a paddy field was 3000m2. The total fluxes were 33 kg (SS), 85 g (total-N), and 46 g (total-P) in Field A, with a small decrease in water levels (8mm), 110kg (SS), 589 g (total-N), and146 g (total-P) in Field B with a major decrease in water levels (72mm). Furthermore, the nitrogen/ phosphorus ratios (mol ratios) of the waste water by the enforced draining were 4.1 (Field A) and 8.8 (Field B). In comparison with N/P of the phytoplankton (16), it was found that the phosphorus flowed out efficiently with the enforced draining. Increasing the supply of the phosphorus to Lake Biwa is not desirable in view of the current problems of eutrophication. The careless water management of paddy fields was a crucial factor in any plan to improve the water quality of Lake Biwa.

AB - The runoff of suspended substances (SS), nitrogen, and phosphorus by enforced draining during the ploughing season was calculated from experiments in two paddy fields. The area of a paddy field was 3000m2. The total fluxes were 33 kg (SS), 85 g (total-N), and 46 g (total-P) in Field A, with a small decrease in water levels (8mm), 110kg (SS), 589 g (total-N), and146 g (total-P) in Field B with a major decrease in water levels (72mm). Furthermore, the nitrogen/ phosphorus ratios (mol ratios) of the waste water by the enforced draining were 4.1 (Field A) and 8.8 (Field B). In comparison with N/P of the phytoplankton (16), it was found that the phosphorus flowed out efficiently with the enforced draining. Increasing the supply of the phosphorus to Lake Biwa is not desirable in view of the current problems of eutrophication. The careless water management of paddy fields was a crucial factor in any plan to improve the water quality of Lake Biwa.

KW - Enforced draining

KW - Lake Biwa

KW - Nitrogen

KW - Paddy field

KW - Phosphorus

KW - SS

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The runoff of suspended, substances, nitrogen, and phosphorus by enforced draining during the ploughing season experiments in paddy fields

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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