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龙粳2号是黑龙江省农科院水稻研究所以合交7129/合单76-090选育而成。1990年3月经黑龙江省农作物品种审定委员会审定通过(原代号合交7811)。
Longjing 2 is the Institute of Heilongjiang Academy of Agricultural Sciences, a cross 7129 / together 76-090 bred. In 1990 March by the Heilongjiang Province Crop Variety Approval Committee approved (the original code of 7811).