Effect of sowing rate on population growth of interplanting rapeseed in double-cropping rice
To find out proper sowing rate of interplanting rapeseed in double-cropping rice,rapeseed cultivar Fengyou 730 was used in field during 2016 to 2017.Five sowing rates (3.75,4.50,5.25,6.00 and 6.75kg/hm2) were designed.The effect of different rates on rapeseed were investigated,including growth processes,density,seedling rate,mature plant rate,individual growth-development,disease resistance,yield and yield components.Results showed that seedling rate and mature plant rate decreased with the higher sowing rate.Individual growth was significantly affected.Traits of total leaves,green leaves,maximum leaf length,maximum leaf width,crown diameter,dry matter weight per plant,were decreased with the higher sowing rate.While leaf area index and dry matter weight of population increased at the beginning,and then decreased with the higher sowing rate.The leaf area and population dry weight reached their peaks at the rate of 5.25kg/hm2.Sclerotium disease incidence and index increased with the higher sowing rate.Compared with the rate of 3.75kg/hm2 (Q1),the disease incidence and disease index at the rate of 6.75kg/hm2 (Q5) increased by 19.83％ and 9.92％ respectively.Sowing rate had significantly positive correlation with first branch height,and had significantly negative correlation with plant height,first branch number,pods per plant and seed number per pod.Yield increased with sowing rate at the beginning,but then decreased.The highest yield was obtained at the rate of 5.25 kg/hm2 (Q3) treatment.It indicated that neither higher nor lower sowing rate were recommended for high-yielding population construction.In this study,the rates between 5.25 to 6.00kg/hm2 were optimal for high yield of interplanting rapeseed in double-cropping rice in southern triple cropping system.
sowing rateinterplanting rapeseed in ricegrowth and developmentyield
国家科技期刊平台
NSTL
万方数据
维普
