| Response of water use efficiency of different summer maize cultivars to nitrogen fertilizer and precipitation |
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| DOI：10.7606/j.issn.1000-7601.2008.01.10 |
| Key Words: summer maize water use efficiency cultivar nitrogen fertilizer precipitation |
| Author Name | Affiliation | | YI Zhen-xie | College of Agronomy?Hunan Agricultural University, Changsha 410128, China；Key L aboratory of Ministry of Agriculture for Crop Production and Farming System?College of Agronomy and Biotechnology?China Agricultural University,Beijing 100094,China | | WANG Pu | Key L aboratory of Ministry of Agriculture for Crop Production and Farming System?College of Agronomy and Biotechnology?China Agricultural University,Beijing 100094,China | | CHEN Ping-ping | College of Agronomy?Hunan Agricultural University, Changsha 410128, China | | TU Na-i mei | College of Agronomy?Hunan Agricultural University, Changsha 410128, China |
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| Abstract: |
| Zhengdan958 and Nongda108 were used as plant materials to study the responses of water use efficiency(WUE) of summer maize to nitrogen fertilizer and precipitation under condition of 3 types of N fertilizer with 3 application rates in North China Plain in successive two years(2004～2005).The results showed that(1) WUE of summer maize was increased by N rates from 0～180 kg N/hm2 and differences at a certain extent among types of N fertilizer were observed.(2) Evident genotype differences in WUE existed and there showed trend of Zhengdan958>ND108 under N application and no N application conditions.(3) Positive correlation at 0.01 probability level existed between WUE and yield,and evident positive correlations between WUE and photosynthetic rate,stomatic conductivity and transpiration rate of ear-leaf in filling stage were respectively observed.(4) Evident annual differences in WUE existed and the WUE of two cultivars in 2005 was bigger than those in 2004,which was induced by annual difference in precipitation.Decrease of precipitation in the prophase and whole duration reduced yield and water consumption of summer maize,but decreasing extent of yield was less than that of precipitation,so WUE was improved.The results showed that WUE of summer maize could be clearly improved by choosing appropriate cultivars,cultivating under natural drought or limit irrigation at moderate degree and fertilizing N 180 kg/hm2 under conditions in this study. |
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