王久龙,王振华,李文昊,裴磊,赵波,扁青永,朱延凯.施氮量对复播青贮玉米光合特性和产量的影响[J].干旱地区农业研究,2017,35(5):250~255 |
施氮量对复播青贮玉米光合特性和产量的影响 |
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 |
中文关键词: 施氮量 复播青贮玉米 光合特性 产量 |
英文关键词:N application multiple cropping silage maize photosynthetic characteristics yield |
基金项目:国家科技支撑计划项目(2015BAD20B03) |
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中文摘要: |
采用田间试验方法,研究了一管两行(80+40)行距模式下灌溉量为288 mm时,不同施氮量(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)对复播青贮玉米光合特性的影响,观测了拔节期(08.20)和抽雄吐丝期(09.13)光合特性指标及生育期末期的干物质量、叶面积,计算叶片水平的水分利用效率、光合势及净同化率。施氮量为236.76 kg·hm-2,青贮玉米产量最大;拔节期光合有效辐射为1 500~2 000 μmol·m-2·s-1、施氮量为236.76 kg·hm-2时,青贮玉米的光合指标较大;抽雄吐丝期,光合有效辐射为800~1 900 μmol·m-2·s-1、施氮量为236.76 kg·hm-2时,水分利用效率较大;施氮量为236.76~306.36 kg·hm-2时,青贮玉米的光合势和净同化率均达到最大,施氮量进一步增加,光合势和净同化率降低显著。因此,石河子地区青贮玉米适宜的光合有效辐射为1 500~2 000 μmol·m-2·s-1,施氮量为236.76 kg·hm-2,青贮玉米产量及水分利用效率达到最大。 |
英文摘要: |
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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