Effect of Nitrogen Application Rate on Population Characteristics and Yield of Direct-seeded Rice Zhenghan No.10
FU Jing
WANG Shengxuan
YIN Haiqing
WANG Fuhua
WANG Yuetao
CHEN Xiangong
WANG Ya
YANG Wenbo
BAI Tao
Abstract：A field experiment was conducted to reveal the effects of nitrogen application rates (0,150,180,210,240,270,300,330 kg/ha)on population characteristics,root activity and grain yield of directseeded rice Zhenghan No.10.The results showed that grain yield of direct-seeded rice Zhenghan No.10 increased first and then decreased with the increasc of N application rate,the highest yield was 10.40 t/ha when N application rate was 270 kg/ha,which significantly increased compared the yields of the other treatments.The unit area of the highest tiller,panicle number,leaf area index,plant height,leaf base angle were increased with the increase of N application rate.But spike rate,seed setting rate,grain leaf ratio and light transmission rate were decreased with the increase of N application rate,grain number per panicle and 1 000-grain weight increased first and then decreased with the increase of N application rate.Shoot dry weight showed increasing trend during the whole growth period,then the net photosynthetic rate of leaf,root activity were decreased during the grain filling period.But shoot dry weight,net photosynthetic rate of leaf,root activity increased first and then decreased with the increase of N application rate,which were the highest when the nitrogen application rate was 270 kg/ha.In summary,population characteristics were better,and root activity and grain yield were the highest when N application rate was 270 kg/ha.
Keywords：direct-seeded ricenitrogen application ratepopulation characteristicsphotosynthetic characteristicsroot physiologyyield
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 30-35 )