"a" and no "a"

0Children transplant rice onto 01u00a field02u00 set up near Yangjaecheon stream in southern Seoul. 02br
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00In the sentenc above, how about changing "a field" into "field"?02br
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00My non-native sense of English is that in the sentence, the "field" is to be considered like some nouns like sugar or water, making "field" rather than "a field" more appproriate. 02br
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00But if the situation was like that there were many fields prepared, and some children were planting onto one of the many fields, then "a field" should be appropriate.02br
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00What should be native speakers' sense of English?02br
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00Below is the original newspaper article.02br
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01b00Farming downtown:02b00 Children transplant rice onto a field set up near Yangjaechon stream in southern Seoul, Wednesday. Gapyeong County government in Gyeonggi Province provided rice-planting machines and demonstrated techniques for the event. 02br
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00/ Korea Times Photo by Ryu Hyo-jin030srchttp://www.koreatimes.co.kr/upload/news/top(3).jpgw450