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杂交籼稻新组合协优 ５５９ 高产稳产、米质较优、抗病性强、适应性广，１９９９ 年 ４ 月通过江苏省农作物品种审定。
Xieyou 559, a new indica hybrid rice combination with high and stable yield, better grain quality, stronger disease resistance and wide adaptability, passed the crop varieties approval of Jiangsu Province in April 1999.