中文摘要：

在田间小区遮雨条件下,采用有交互作用的双因素试验方法,设置了连续干旱0-32 d 7个水分处理及N 0、1402、80 kg/hm^23个氮肥处理,研究施氮水平对不同干旱程度夏玉米生长的影响。结果表明,轻度干旱条件下,随着施氮量的增加,夏玉米的株高、叶长、叶宽、茎粗等形态指标、生物量和产量都增加;中度干旱时,适量施用氮肥处理夏玉米的形态指标、生物量及产量均高于不施氮肥和大量施用氮肥处理;严重干旱时,随着施氮量的增加,夏玉米的形态指标、生物量和产量都呈逐渐下降趋势。本试验结果说明,施氮水平对不同干旱程度夏玉米生长有不同影响,应根据干旱程度选择合理的施氮量,以减小干旱带来的损失。

英文摘要：

In order to study the effect of N levels on growth of summer maize under different drought degrees, a field experiment was carried out under rainproof sheds. There were seven drought treatments in which soil drying lasted 0, 7, 12, 17, 22, 27, 32 days and three N levels including N 0, 140, 280 kg/ha in this experiment. The results showed that summer maize morphological changes, including plant height, leaf blade length, leaf blade width, stem diameter, biomass and yield, increased with the amount of N fertilizer applied under slight drought condition. Under moderate soil drought, medium amount of N was better than zero N or high level of N in increasing morphological changes, biomass and yield of summer maize. Plant height, leaf blade length, leaf blade width, stem diameter, biomass and yield decreased when N amount increased under serious soil drought condition. In this experiment, the effects of N levels on summer maize differed with different drought levels, and proper N amount should be chosen so that the harm of drought can be reduced.