Effect of Seeding Rate on Yield and Root Physiological Trait of Direct-seeded Rice Zhenghan No.10

FU Jing; WANG Shengxuan; YIN Haiqing; WU Wei; WANG Yuetao; WANG Fuhua; CHEN Xiangong; WANG Ya; YANG Wenbo; BAI Tao

doi:10.15933/j.cnki.1004-3268.2017.08.004

Abstract：The effects of seeding rates (90,120,150,180,210 kg/ha) on grain yield and root physiological trait of direct-seeded rice Zhenghan No.10,so as to provide theoretical basis for selection of suitable seeding rate of direct-seeded rice.The results showed that grain yield of direct-seeded rice Zhenghan No.10 increased first and then decreased with the increase of seeding rate,the highest yield was 10.64 t/ha when seeding rate was 150 kg/ha.The net photosynthetic rate of leaves of direct-seeded rice Zhenghan No.10 decreased after full heading stage,and increased first and then decreased with the increase of seeding rate,which was the highest when seeding rate was 150 kg/ha.The dry weight of shoots increased with the growth process,and dry weight of root,root absorption area and active absorption area increased with the increase of seeding rate at mid-tillering stage,panicle initiation stage and full heading stage,and increased first and then decreased with the increase of seeding rate at maturity stage,which reached the maximun when seeding rate was 150 kg/ha.The root oxidation activity,root indole-3-acetic acid content,zeatin + zeatin riboside (Z + ZR) content increased first and then decreased with the growth process,which reached the maximun at panicle initiation stage,which decreased with the increase of seeding rate,which decreased more obviously when seeding rate were more than 150 kg/ha at full heading stage and maturity stage.In summary,when seeding rate was 150 kg/ha,the net photosynthetic rate of leaves of direct-seeded rice Zhenghan No.10 was the maximum,the dry weight of shoots and root,root absorption area and active absorption area reached the maximum at maturity stage,root oxidation activity,root indole-3-acetic acid content,Z + ZR content were higher,and grain yield was the highest.