| Effects of nitrogen application rate on photosynthetic characteristics and yield of silage maize |
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| DOI：10.7606/j.issn.1000-7601.2017.05.37 |
| Key Words: N application multiple cropping silage maize photosynthetic characteristics yield |
| Author Name | Affiliation | | WANG Jiu-long | College of Water ＆ Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Corps Key Laboratory of Modern Water-saving Irrigation, Shihezi, Xinjiang 832000, China | | WANG Zhen-hua | College of Water ＆ Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Corps Key Laboratory of Modern Water-saving Irrigation, Shihezi, Xinjiang 832000, China | | LI Wen-hao | College of Water ＆ Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Corps Key Laboratory of Modern Water-saving Irrigation, Shihezi, Xinjiang 832000, China | | PEI Lei | College of Water ＆ Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Corps Key Laboratory of Modern Water-saving Irrigation, Shihezi, Xinjiang 832000, China | | ZHAO Bo | College of Water ＆ Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Corps Key Laboratory of Modern Water-saving Irrigation, Shihezi, Xinjiang 832000, China | | BIAN Qing-yong | College of Water ＆ Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Corps Key Laboratory of Modern Water-saving Irrigation, Shihezi, Xinjiang 832000, China | | ZHU Yan-kai | College of Water ＆ Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Corps Key Laboratory of Modern Water-saving Irrigation, Shihezi, Xinjiang 832000, China |
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| Abstract: |
| In this study, a field experiment used a tube of two lines (80+40) spaced mode, irrigation quota of 288 mm, to study the effects of N application rate (CK～14.04 kg·hm-2, F1～97.56 kg·hm-2, F2～167.16 kg·hm-2, F3～236.76 kg·hm-2, F4～306.36 kg·hm-2, F5～375.96 kg·hm-2) on silage maize and photosynthetic characteristics. At the jointing stage (08.20) and tasseling stage (09.13), photosynthesis characteristic indexes, fertility of the final quality of dry matter, leaf area, the leaf level of water use efficiency, photosynthetic potential and net assimilation rate were calculated. When the N application rate was 236.76 kg·hm-2, silage maize yield was the largest and when photosynthetic active radiation was 1 500～2 000 μmol·m-2·s-1, N application rate was 236.76 kg·hm-2, silage corn WUE was larger; at spinning tasseling stage, photosynthetic active radiation was 1 500～2 000 μmol·m-2·s-1, and N application rate was 236.76 kg·hm-2, the WUE was larger; when N application rate was 236.76～306.36 kg·hm-2, silage maize photosynthetic potential and net assimilation rate achieved the maximum level. When the N application rate was increased, photosynthetic potential and net assimilation rate decreased significantly. Therefore, in Shihezi area, the photosynthetic active radiation of 1 500～2 000 μmol·m-2·s-1, and N application rate of 236.76 kg·hm-2, are the appropriate level to achieve the maximum silage corn yield and WUE. |
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