The Study of Runoff Loads from Lotus Paddy Fields

• KURODA Hisao

  College of Agriculture, IBARAKI University

• KATO Tasuku

  College of Agriculture, IBARAKI University

• NAKASONE Hideo

  College of Agriculture, IBARAKI University

Bibliographic Information

Other Title

• ハス田群からの流出負荷量調査について
• ハスダグン カラ ノ リュウシュツ フカリョウ チョウサ ニ ツイテ

Abstract

To solve the problem of diffuse pollution brought about of eutrophication in lakes, an investigation was conducted in lotus paddy fields, at which little research had been conducted. The study area consisted of low-land lotus paddy fields around the Lake Kasumigaura watershed in Ibaraki Prefecture. The area is well known as the largest production center of lotus roots in Japan. The results of the study show that the mass balance loads of total nitrogen(T-N), total phosphorus(T-P), chemical oxygen demand(COD), and suspended solids from the lotus paddy fields were -3.22 , 1.87, 75.36 and 552 kg·km^-2·d^-1, respectively. Comparing these values to the unit reported in "The Fifth Plan for Water Quality Conservation in the Lakes and Ponds related to Lake Kasumigaura", it was found that T-N was purified, T-P was 2.1 times higher and COD was 4.8 times higher. It was found that the major cause of the effluent loads was the outflow of suspended matters during puddling and lotus planting. The dissolved matter was influenced by the increase of discharge. The suspended matter discharge from the lotus paddy fields temporarily accumulated at the end of the drainage canals and flowed out when there was a rainfall.

Journal

• Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering

  Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 78 (1), 47-53, 2010

  The Japanese Society of Irrigation, Drainage and Rural Engineering

Keywords

• Lotus root
• Lotus paddy fields
• Runoff loads
• Suspended matters
• Nutrients
• Mass balance of runoff load

Details

• CRID: 1390282680263829248
• NII Article ID: 10026349339
• NII Book ID: AA12240517
• DOI: 10.11408/jsidre.78.47
• ISSN: 18847242
• ISSN: 18822789
• NDL BIB ID: 10601401
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10601401
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed