Effects of Seeding Rates and Sowing Methods on Wheat Growth and Development and Yield Traits in Wheat -Cotton Intercropping System

Wang Shulin; Qi Hong; Wang Yan; Zhang Qian; Feng Guoyi; Lin Yongzeng; Liang Qinglong

doi:10.14083/j.issn.1001-4942.2016.07.008

Abstract：In order to increase the wheat yield and select suitable sowing method and seeding rate in wheat -cotton intercropping system,a split plot experiment involving two sowing methods (broadcasting and drilling)as principal factors and four seeding rates (187.5,225.0,262.5 and 300.0 kg·hm -2 )as vice factors was designed to study the effects of sowing methods and seeding rates on wheat growth and development and yield traits.The results showed that compared with drilling,the broadcasting increased the captured light energy of wheat population;the diameter of the second internode in wheat stem base increased by 0.05 mm;the dry matter accumulation above ground per unit area increased by 6.1%;the root biomass was better than that of drilling;the panicle number per unit area increased by 11.8%;but there was no significant differences in grains per ear and thousand -grain weight;at last the yield of broadcasting increased by 5.1% than that of drilling.With the increase of seeding rate,the captured light energy of wheat population,dry matter accumu-lation above ground,root biomass and panicle number per unit area all increased,but the individual plant de-velopment was weakened,and the panicle number of individual plant,grains per ear and thousand -grain weight decreased.The yield among different seeding rates was significantly different for broadcasting,and it reached the highest when the seeding rate was 225.0 kg·hm -2 .For drilling,the yield was the highest under the seeding rate of 262.5 kg·hm -2 .In cotton -wheat system,the wheat yield might be increased using broadcasting method with the seeding rate of 225.0 kg·hm -2 .