中文摘要：

通过多年田间小区试验，研究了不施肥、单施磷肥、单施氮肥和氮磷配施等四种施肥条件下，灌浆结实期冷型小麦和暖型小麦叶片氮含量的差异。结果表明，开花期，在不施肥和氮磷配施条件下，冷型小麦冠层顶三叶的氮百分含量均显著高于暖型小麦；在单施磷肥时，旗叶的氮百分含量也较高；在单施氮肥时，倒三叶、下部叶的氮百分含量显著高于暖型小麦。花后前28天，冷型小麦陕229的冠层顶三叶氮百分含量均显著高于暖型小麦，小偃6号的旗叶在花后前14天、倒二叶在花后前28天、倒三叶在花后前21天也高于暖型小麦。增施氮肥时，冷型小麦下部叶的氮百分含量也明显高于暖型小麦。这为冷、暖型小麦冠层温度的差异提供了氮营养基础。

英文摘要：

It was studied that difference of foliage N contents between cold type wheat （CTW） and warm type wheat （WTW） by perennial micro - field trials. There were 4 wheat genotypes tested and 4 fertilizer treatments. Two of genotypes were cold type wheat （shaan229 and Xiaoyan6）, which had lower canopy temperature, the other 2 genotypes were warm type wheat（ NR9430 and 9405 ） which had higher canopy temperature. The 4 fertilizer treatments were CK （ no fertilizer）, P fertilization （ 176.25 kg hm^-2 P2O5 ）, N fertilization （237.0 kg hm^-2 N ） and NP fertilization （ 176. 25 kg hm^-2 P205 plus 237.0 kg hm^-2 N respectively）. Field experiments were conducted from 2002 to 2004 at the Agricultural Experimental Station of Northwest A＆F University, Yangling, Shanxi Province, China. The results showed that at anthesis, the N contents of the flag leaf, the second leaf and the third leaf of CTW were higher than that of WTW in the CK and NP treatments; the N content of the flag leaf of CTW was higher than that of that of WTW in the P treatment; the N content of the third leaf and the other leaf of CTW were higher than that of WTW in the N treatment. The N contents of the 3 leaves of Shaan229 and the second leaf of Xiaoyan 6 were higher than that of WTW genotypes in the 4 weeks after flowering, and so were the N contents of the flag leaf of Xiaoyan 6 in the 2 weeks and the third leaf in the 4 weeks after flowering. The N content of other leaves of CTW were higher than that of WTW in the N and NP treatments. The difference of foliage N content maybe was one of foundations of canopy temperature of two kinds of genotypes.