| Effect of nitrogen application rate on canopy temperature and its relationship with biological characteristics of winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2010.03.27 |
| Key Words: rate nitrogen fertilization different canopy temperature types of wheat canopy temperature yield its components |
| Author Name | Affiliation | | ZHUGE Aiyan | College of Life Sciences , Northwest A&F University, Yangling, Shaanxi 712100，China | | QU Zhengwei | College of Life Sciences , Northwest A&F University, Yangling, Shaanxi 712100，China | | ZHOU Chunju | College of Life Sciences , Northwest A&F University, Yangling, Shaanxi 712100，China | | HE Lianshuai | College of Life Sciences , Northwest A&F University, Yangling, Shaanxi 712100，China | | HU Bing | College of Life Sciences , Northwest A&F University, Yangling, Shaanxi 712100，China | | HAO Yingbin | College of Life Sciences , Northwest A&F University, Yangling, Shaanxi 712100，China |
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| Abstract: |
| A field experiment was caried out to study the effect of four nitrogen treatments (N0, N120, N240 and N360) on CT(canopy temperature), yield, yield component elements and transpiration rate of three wheat varieties (Shaan229, Xiaoyan22 and NR9405) during the period from jointing to maturity. The results showed that NO CT were higher than the nitrogen treatment on each stage, and the difference was higher with the development of growth, at the late grain-filling stage filling up to the maximum. There were no significant differences among nitrogen treatments during
jointing stage. N240 treatment performed the lowest CT during booting to flowering period, while N120 and N360 had no significant differences between each other. The CT was in the order of N360> N120 > N240 during early grain flling stage, and the differences were 0.1C ~0.6C. The CT was in the order of N120 > N240 > N360 during mid-late grain filling stage, and the difference were 0.1C~ 1.5C. The largest differences of CT among the three varieties were also in late grain flling stage , but the temperature type of wheat could not be changed by nitrogen fertilizations . The transpira-tion rate and CT had extremely significant negative corelation. The CT and the theoretical yield also had extremely signif-icant negative correlation from jointing to maturity, and the most extremely significance Was in late grain flling stage. The grain number per spike and spike number had negative correlation with CT in each stage, getting the largest in the joint-ing and late grain flling stage respectively. 1000 grain weight had extremely positive correlation with CT during jointing stage, and positive correlation with CT during booting and flowering stages, and the greatest relevance was in jointing stage. It is suggested that CT at mid-late grain filling stage can be used as a parameter to estimate yield and can be used as an indicator of N fertilizer application. |
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