| Regulation effect of nitrogen and planting density on canopy temperature diurnal change of heavy ear winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2011.04.18 |
| Key Words: nitrogen fertilization planting density canopy temperature daily variation yield and its components |
| Author Name | Affiliation | | HAO Yingbin | College of Life Science, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHOU Chunju | College of Life Science, Northwest A & F University, Yangling, Shaanxi 712100, China | | WANG Changfa | College of Agronomy, Northwest A & F University, Yangling, Shaanxi 712100, China | | CHEN Qianqian | College of Life Science, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Tianjiao | College of Life Science, Northwest A & F University, Yangling, Shaanxi 712100, China | | WANG Linquan | College of Resoruces and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| A field experiment was carried out to study the effect of nitrogen and planting density on canopy temperature (CT) and diurnal change of canopy temperature depression (CTD), yield, yield component elements and SPAD of heavy-ear winter wheat in the grain-filling stage. The results show that nitrogen fertilization (120～360 kg/hm2) may change CT, it increases CT during 8∶00～10∶00 in the morning but decreases CT during 14∶00～18∶00 in the afternoon. Among different fertilization rate, N240～N360 changes CT more significantly than N120. The CT has a stable tendency with the increase of nitrogen fertilizer application, but there are no significant differences among the planting densities in this field experiment. The theoretical yield, 1000-grain weight, grain number per spike and spike number have positive or negative correlation with CT, and the correlation at 16∶00 is very significant. It is suggested that CT at 16∶00 can be used as a parameter to estimate yield and can be used as an indicator of N fertilizer application. |
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