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

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Vietnam
Rivers
paddies
surface water
Water
monitoring
ponding (water management)
drainage channels
Nitrification
nitrification
Fertilizers
irrigation water
drinking water
soil pH
nitrogen fertilizers
Drinking Water
Drainage
Soil
rice
water

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science

Cite this

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

In: Journal of the Faculty of Agriculture, Kyushu University, Vol. 47, No. 1, 01.10.2002, p. 159-165.

Research output: Contribution to journalArticle

Kurosawa, Kiyoshi ; Do Nguyen, Hai ; Nguyen Tat, Canh ; Nguyen Huu, Tanh ; Nguyen Dinh, Manh ; Egashira, Kazuhiko. / 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. In: Journal of the Faculty of Agriculture, Kyushu University. 2002 ; Vol. 47, No. 1. pp. 159-165.
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