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采用田间试验研究了缓/控释氮肥和不同施氮次数对夏玉米氮代谢、氮素吸收及产量的影响。结果表明,施氮显著增加了穗位叶硝酸还原酶活性、游离氨基酸含量、叶绿素含量和氮素积累量,提高了百粒重,增产20.93%~27.04%。与习惯两次施氮相比,一次性施用缓/控释氮肥和“苗肥30%+大口肥30%+吐丝肥40%”三次施氮的灌浆期游离氨基酸含量分别高2.77 mg g-1和4.07 mg g-1,氮素积累量分别提高了4.18%和9.74%,氮肥利用率分别提高了2.95和6.88个百分点,产量分别增加了4.88%和5.05%,实现了夏玉米增产和高效施肥。
Field experiments were conducted to study the effect of slow / controlled release nitrogen fertilizer and nitrogen fertilizer application on nitrogen metabolism, nitrogen uptake and yield of summer maize. The results showed that nitrogen application significantly increased nitrate reductase activity, free amino acid content, chlorophyll content and nitrogen accumulation in panicle leaves, increased 100-grain weight and increased yield by 20.93% -27.04%. Compared with the conventional nitrogen application, the content of free amino acids in the three nitrogen application periods was higher by 2.77 mg g-1 and 4.07 mg g-1, respectively. Nitrogen accumulation increased by 4.18% and 9.74%, and nitrogen use efficiency increased by 2.95 and 6.88 percentage points respectively, yield increased by 4.88% and 5.05% respectively. And efficient fertilization.