Effects of Nitrogen Application on Nitrogen Dynamic Changes and Nitrogen Use Efficiency in Maize
[Objective] This study aimed to investigate the nitrogen dynamic changes and nitrogen use efficiency in maize under different nitrogen application patterns. [Method] Maize cultivar Xianyu 335 was selected as the experimental material and was planted at two densities 85 000 and 95 000 plants/hm2. The total amount of fertilizers applied kept constant. The nitrogen content in leaves, stems, sheathes, husks, grains, cobs, tassels and filaments of maize plants in jointing stage, silking stage, 15, 30, 45 and 60 d after silking stage was measured. [Result] Total nitrogen content in maize plant reached the peak around 45 d after silking stage and a higher population was helpful to nitrogen accumulation. Total nitrogen content of maize plant was positively correlated with yield and it got closer in higher popula-tion. Grain nitrogen content and nitrogen harvest index were significantly positively correlated with yield in higher population. High ratio of nitrogen fertilizer in silking stage was beneficial to nitrogen accumulation in leaf and ear, as wel as nitrogen translocation in stem and sheath, but high ratio of nitrogen fertilizer in earlier stage delayed nitrogen metabolism. Nitrogen uptake peak was from silking stage to 15 d after silking stage, and nitrogen uptake rate increased high ratio of nitrogen fertilizer was applied in later growth stages and moved forward in higher plant population. [Conclusion] It was advantaged for nitrogen fertilizer efficiency on condition that ni-trogen application was moved backward. Accumulating too much nitrogen in earlier stages inhibited nitrogen uptake in later periods.
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