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中文摘要：
探讨桂中蔗区甘蔗氮肥施用效应，为当地甘蔗生产合理施用氮肥提供理论依据。2010-2011年在广西来宾市兴宾区进行不同施氮水平对该地区甘蔗生长与产量影响的肥效试验。结果表明，在甘蔗分蘖期、伸长初期、工艺成熟期，当N〉345kg/hm^2时，随着氮肥施用量的增加，甘蔗的生长势不断增强。与不施氮肥处理（N0）相比，施氮处理的有效茎数、单茎重、产量分别平均提高2．93％、6．30％和10．28％。当氮肥施用量达到一定水平（N用量〉750kg/hm^2）时，甘蔗有效茎数随着施肥量的继续增加而降低，氮肥农学效率降低也较为明显。可见，在桂中蔗区甘蔗施氮119．85k/hm^2，既能确保甘蔗高产，又能保证肥料资源得到高效利用，是一个比较合理的施氮水平。
英文摘要：
The effect of N fertilization on agronomic traits and yield of sugarcane in middle area of Guangxi, was investigated to rationalize the N fertilizer in sugarcane production. Field experiments were conducted to investigate the effects of different dosages of N fertilizer on growth characteristics and yield of sugarcane in Xingbin District of Guangxi during 2010-2011. Results show that In sugarcane tillering, early elongation, process maturity, when N 〉 345 kg/hm2, with the increase in the amount of nitrogen fertilizer, the growth potential of sugar cane growing. And non-nitrogen treatment （No） compared to N treatment of the effective number of stems, one stem weight, respectively, yield an average of 2.93%, 6.30% and 10.28%. When a certain level of nitrogen fertilizer （N〉 750 kg/hm2）, the effective number of stems of sugarcane continued to increase with the amount of fertilizer decreases, reducing nitrogen agronomic efficiency is also more obvious. Seen in Guangxi sugarcane N 119.85 kg/hm2, both to ensure that sugar cane yield, but also ensures efficient use of resources fertilizer, nitrogen is a more reasonable level.
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