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玉米生殖生长开始,即抽雄后吸收的氮占吸收总氮的60～75％(Friedrich等,1979;Mills等,1982)。所以,从抽雄到成熟期间氮的有无会影响植株的营养生长和穗的发育。玉米抽雄前(播种后7周内)NH_4和NO_3两种形态的氮配合比其中单一形态氮更能促进玉米的营养生长(Schrader等,1972)。甜玉米抽雄前对NH_4和NO_3的吸收相等,而穗发育期间对NH_4的吸收超过NO_3(Mills和Mcel-
Maize reproductive growth begins, that is, nitrogen absorbed after tasselling accounts for 60-75% of total nitrogen absorbed (Friedrich et al., 1979; Mills et al., 1982). Therefore, from tasseling to ripening during the presence of nitrogen will affect plant vegetative growth and ear development. Before tasseling of maize (within 7 weeks after sowing), nitrogen forms of both NH_4 and NO_3 promoted the vegetative growth of maize more than single form nitrogen (Schrader et al., 1972). Before the tasselling, sweet corn had equal absorption of NH_4 and NO_3, and absorbed NH_4 more than NO_3 during the development of ear (Mills and Mcel-