A preliminary monitoring of the NO 3-N concentration in the surface water in the paddy-cultivated area of the central Red River Delta, Viet Nam

Kiyoshi Kurosawa, Hai Do Nguyen, Canh Nguyen Tat, Tanh Nguyen Huu, Manh Nguyen Dinh, Kazuhiko Egashira

Research output: Contribution to journalArticle

Abstract

The NO 3-N concentration and pH in the surface water in the paddy-cultivated areas of the central Red River Delta, Viet Nam were monitored at 24 sites of 5 districts in March 2002 after the spring rice was transplanted. In the areas, fertilizer N of 100-150 kg/ha has been conventionally applied in each of the three cultivations in a year. The measured NO 3-N concentration was in the range of 0.11-3.03 mg/L and was below the permissible level of 11.3 mg/L for drinking water, but some samples exceeded the standard for pH (8.5). The districts could be separated from one another according to the combination of the NO 3-N and pH levels, but this separation was not due to the comparative land elevation. Relevant factors such as the soil pH, the amount and time of N application in every cultivation, and the NH 4 level are to be monitored in the future study. The NO 3-N concentration was negatively correlated with the pH level in some districts, possibly impacted by nitrification. No remarkable difference was observed in both the NO 3-N and pH levels between the ponding water of the paddy field and the water of the neighboring irrigation/drainage canal.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalJournal of the Faculty of Agriculture, Kyushu University
Volume47
Issue number1
Publication statusPublished - Oct 1 2002

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science

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