首页|Effects of dense planting patterns on photosynthetic traits of different vertical layers and yield of wheat under different nitrogen rates
Effects of dense planting patterns on photosynthetic traits of different vertical layers and yield of wheat under different nitrogen rates
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A two-year field experiment was conducted to measure the effects of densification methods on photosyn-thesis and yield of densely planted wheat.Inter-plant and inter-row distances were used to define rate-fixed pattern(RR)and row-fixed pattern(RS)density treatments.Meanwhile,four nitrogen(N)rates(0,144,192,and 240 kg N ha-1,termed N0,N144,N192,and N240)were applied with three densities(225,292.5,and 360 × 104 plants ha-1,termed D225,D292.5,and D360).The wheat canopy was clipped into three equal vertical layers(top,middle,and bottom layers),and their chlorophyll density(ChD)and pho-tosynthetically active radiation interception(FIPAR)were measured.Results showed that the response of ChD and FIPAR to N rate,density,and pattern varied with different layers.N rate,density,and pattern had significant interaction effects on ChD.The maximum values of whole-canopy ChD in the two seasons appeared in N240 combined with D292.5 and D360 under RR,respectively.Across two growing seasons,FIPAR values of RR were higher than those of RS by 29.37％for the top layer and 5.68％for the middle layer,while lower than those of RS by 20.62％for the bottom layer on average.With a low N supply(N0),grain yield was not significantly affected by density for both patterns.At N240,increasing density significantly increased yield under RR,but D360 of RS significantly decreased yield by 3.72％and 9.00％versus D225 in two seasons,respectively.With an appropriate and sufficient N application,RR increased the yield of densely planted wheat more than RS.Additionally,the maximum yield in two seasons appeared in the combination of D360 with N144 or N192 rather than of D225 with N240 under both pat-terns,suggesting that dense planting combined with an appropriate N-reduction application is feasible to increase photosynthesis capacity and yield.
Chlorophyll densityDensification methodNitrogenPhotosynthetically active radiationinterceptionWheat
National Engineering and Technology Center for Information Agriculture,Nanjing Agricultural University,Nanjing 210095,Jiangsu,China
MOE Engineering Research Center of Smart Agricultural,Nanjing Agricultural University,Nanjing 210095,Jiangsu,China
MARA Key Laboratory for Crop System Analysis and Decision Making,Nanjing Agricultural University,Nanjing 210095,Jiangsu,China
Jiangsu Key Laboratory for Information Agriculture,Nanjing Agricultural University,Nanjing 210095,Jiangsu,China
Institute of Smart Agricult
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国家重点研发计划国家自然科学基金Jiangsu Provincial Key Technologies Research and Development Program of ChinaGuidance Foundation of the Sanya Institute of Nanjing Agricul-tural University,Chinaearmarked fund for Jiangsu Agricultural Industry Technology Systemearmarked fund for Jiangsu Agricultural Industry Technology System
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