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Author: search.filters.author.Chinoim, NanthanaSubject: search.filters.subject.Nitrate contamination

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    Phosphorus accumulation in soils and nitrate contamination in underground water under export-oriented asparagus farming in Nong Ngu Lauem village, Nakhon Pathom province, Thailand
    (2004-02-01)
    Phupaibul, Patcharaporn
    ;
    Chitbuntanorm, Chatuporn
    ;
    Chinoim, Nanthana
    ;
    Kangyawongha, Pornthiwa
    ;
    Matoh, Toru
    Asparagus fields in Nong Ngu Lauem village, Nakhon Pathom province, Thailand, were surveyed for the cultural practices adopted, yield, fertilizer use, nutrient accumulation in soils, and nitrate-nitrogen concentration of the underground water. In this village, asparagus is being cultivated under contract farming with a Japanese agribusiness company and 60% of the product is exported to Japan. Average application rates of nitrogen- and phosphorus-fertilizers were 840 kg N and 286 kg P ha<sup>−1</sup> year<sup>−1</sup>, and less than 5% of the applied elements was recovered in the harvested products. Phosphorus accumulated in the surface 20 cm soil significantly, unlike N determined by the Kjeldahl method. Higher concentration of nitrate-nitrogen was detected down to 1-m depth in the asparagus fields compared with the adjacent sugarcane fields. Underground water samples were taken from 15 wells of the village and their content of nitrate-nitrogen was determined once a month during a period of 18 months. Nitrate-nitrogen was distributed unevenly among the wells, and no periodic peaks in the concentrations were detected. The highest value of 39 g nitrate-nitrogen m<sup>−3</sup> was recorded. © 2004 Taylor & Francis Group, LLC.