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两系杂交稻新组合培两优九九在湖北省荆门市的适宜播期应在 4月 3 0日以前 ,每公顷纯氮用量不能低于 187 5kg ,追施氧化钾容易减产
The suitable sowing date for two-line hybrid rice combination Liangyou 99 in Jingmen City of Hubei Province should be no less than 187 5kg of pure nitrogen per hectare before April 30,