华安３ 号最适宜的秧龄、密度、纯氮分别是３８ｄ、２２．５ 或１５．０ 万穴／ｈｍ ２、１８７．５ｋｇ／ｈｍ ２。必须施足基面肥，不施促蘖肥，以促苗早发、快发，奠定大穗基础；超前搁田，在每公顷茎蘖苗达１５０ 万时即开始搁田，以稳苗健株，协调群体发展，控制无效分蘖，增加有效积累；合理巧施穗粒肥，养根保叶，活熟到老，提高结实率和千粒重，夺取高产。 The most suitable seedling age, density and pure nitrogen of Huaan No.3 were 38d, 22.5 or 150,000 points / hm 2, 187.5kg / hm 2, respectively. Must apply enough basic surface fertilizer, not to promote tillering, to promote seedling early hair, fast hair, laying a big spike foundation; ahead of the rest field, in each hectare stem tillering 1500000 when the field began to rest, , Coordinating the development of the group, controlling ineffective tillers and increasing the effective accumulation; reasonably applying spike fertilizer, raising leaves and preserving leaves, living to old age, increasing seed setting rate and 1000-grain weight, and obtaining high yield.