Science Links Japan | Quality of Groundwater and Surface Water in Terms of Inorganic Nitrogen Concentration in an Urbanized Agricultural Area around Ha Noi, Viet Nam

Quality of Groundwater and Surface Water in Terms of Inorganic Nitrogen Concentration in an Urbanized Agricultural Area around Ha Noi, Viet Nam

Accession number;06A0208707

Title;Quality of Groundwater and Surface Water in Terms of Inorganic Nitrogen Concentration in an Urbanized Agricultural Area around Ha Noi, Viet Nam

Author; KUROSAWA KIYOSHI (Kyushu Univ.) DO HAI NGUYEN (Hanoi Agricultural Univ., Vnm) NGUYEN THANH HUU (Hanoi Agricultural Univ., Vnm) TRAN LE HA THI (Hanoi Agricultural Univ., Vnm) EGASHIRA KAZUHIKO (Kyushu Univ.)

Journal Title;Nettai Nogyo

Journal Code:F0874A

ISSN:0021-5260

VOL.50;NO.1;PAGE.15-22(2006)

Figure&Table&Reference;FIG.1, TBL.4, REF.19

Pub. Country;Japan

Language;English

Abstract;In an urbanized agricultural area near the center of Ha Noi City, pH, ORP, and ammonium-N and nitrate-N concentrations were monitored for the surface water (canal/pond) and groundwater (shallow/deep tubewell) used locally for irrigation and domestic purposes, respectively. Only vegetables were cultivated eleven times throughout the year in farmland, and the rate of annual fertilizer N application amounted to 960-1,150kg/ha. The pH was in the neutral range. The ORP varied from reductive/intermediate to oxidative states. The ammonium-N concentration was high (1.3-15.1mg/L), while the nitrate-N concentration was low (0.09-2.2mg/L). The effect of fertilizer N application on the ammonium-N concentration was recognized in the surface water. The presence of ammonium-N in the groundwater was due to the percolation of surface water contaminated with NH4'+'. The effect of fertilizer N application on the nitrate-N concentration was not recognized in either surface water or groundwater. In the canal water, the ammonium-N plus nitrate-N concentration reached a harmful level for irrigation use (>5mg/L). In the groundwater, the ammonium-N concentration exceeded the critical level of drinking use for human health. Therefore, countermeasures should be urgently implemented. (author abst.)

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