密度对不同株型的玉米农艺、根系性状及产量的影响

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.

Effects of Planting Density on Agricultural Characters,Root System Characters and Yield of Different Maize Plant Types