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NO3- content could be reduced to 500 ㎎·㎏-1 FW which was 1/10 of that in the conventional methods, while maintaining the productivity similar to the conventional method. And NO3- content could be reduced to 200 ㎎·㎏-1 FW, 1/20 of the traditional method, by applying (NH4)2CO3 from seedling stage.
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