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《Journal of Maize Sciences》 2008-05
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Effects of Planting Density on Agricultural Characters,Root System Characters and Yield of Different Maize Plant Types

LI Ning1,ZHAI Zhi-xi1,LI Jian-min1,WU Pei-bo2,et al.(1.College of Agriculture and Biotechnology,Agricultural University,Beijing 100094; 2.Jin Hai Seed Co.,Ltd.Laizhou 261418,China)  
Density is the key factor of maize high-yield cultivation.Effects of planting density on agricultural characters,root system characters and yield were studied using different maize plant type semi-compact maize Jinhai 5,compact maize Zhengdan 958.The result showed that with the increasing of density,plant height was increased,stem diameter and ear diameter was decreased,ear was shorten,rare top length,No.of ear nod,ear height was increased,brace root number and total root number was decreased,the rate of root dry weight was increased within farming layers,population dry matter accumulation was increased and plant dry matter accumulation presented the opposite trend,ear linage,kernels per ear,100-kernels weight,double-ear rate,plant yield was decreased,yield was increased and decreased successively.The relation between yield and density of Jinhai 5 was Y=-625.67x2+9 044.5x-18 530,optimal plant density was 7.0×104-7.5×104 plants/ha,the relation between yield and density of Zhengdan 958 was Y=-375.67x2+6 410x-13 043,optimal plant density was 8.5×104-9.0×104 plants/ha.Analysis revealed the number of brace roots and total roots could be used as an indicator for plant dry weight and yield.
【Fund】: 国家科技支撑计划——粮食主产区农田生态健康管理关键技术研究与示范(2006BAD02A15)
【CateGory Index】: S513
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