Nitrogen(N) is one of the main factors restricting the photosynthesis，and the deficiency of N will ul timately affect the yield and quality of crops．Field trials were conducted using Changwu 134(Dryland cultivar) an Zhengmai 9023(Irrigated- land cultivar) as material to study the effect of four nitrogen rates on photosynthesis an biomass of wheat at different growth stages．The results showed that，in the range of N 0－ 180 kg /ha，the chlorophyl (Chl) content，photosynthetic rate(Pn)，photosynthetic performance index(PI) and biomass of the two varieties a different stages all showed a upward trend with the increasing nitrogen application level．However，when the nitroge application level was increased further(180 kg /ha)，the Pn and biomass of the two varieties began to present downward trend，while the PI and Chl contents had no significant changes．Furthermore，the changing trend of yiel with increasing nitrogen level were the same to that of phtosynthesis and biomass in the two varieties，the highes yiled being from the treatment 180 kg /ha．
GAO Su-ling
,
MIAO Feng
,
CHEN Jian-hui
,
XIN Long-fei
,
SHAO Rui-xin
. Effects of Nitrogen Levels on Photosynthetic Characteristics of Triticum aestivum L． in Dry Farmland[J]. Acta Agriculturae Boreali-Sinica, 2013
, 28(4)
: 169
-173
.
DOI: 10.3969/j.issn.1000-7091.2013.04.031
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