播幅和施氮水平对新芒1号老芒麦种子产量及质量的影响OA

In order to investigate the effects of sowing widths and nitrogen application rates on seed yield,yield components and seed quality of Elymus sibiricus L.cv.Xinman No.1,a two-factor randomized block design was adopted.Three sowing widths(3 cm,5 cm,10 cm)and four nitrogen application rates(0,45,90,135 kg/hm2)were set with three replications per treatment.Seed yield,yield components,ger-mination percentage,germination energy,germination index and vigor index were measured to screen the optimal planting combination for seed production of Elymus sibiricus L.cv.Xinman No.1.Sowing widths,nitro-gen application rates and their interaction significantly affected the number of tillers,reproductive shoots,spikelets per reproductive shoot,1000-grain weight and seed yield(P<0.05).The treatment of 10 cm so-wing width+90 kg/hm2 nitrogen had significantly higher number of tillers(1 570.37 shoots),reproductive shoots(944.69 shoots)and actual seed yield(1 680.63 kg/hm2)than other treatments(P<0.05).So-wing widths and nitrogen application rates significantly influenced germination energy,germination index and vigor index respectively(P<0.05).Compared with conventional drilling without nitrogen applica-tion,10 cm sowing width+90 kg/hm2 nitrogen performed the best,with germination energy of 90.25%,germination index of 13.16 and vigor index of 3.33(P<0.05).Path analysis showed that the number of reproductive shoots had the largest direct contribution to seed yield with a direct path coefficient of 0.907.The optimal seed yield and quality of Elymus sibiricus L.cv.Xinman No.1 could be obtained under the condition of 10 cm sowing width combined with 90 kg/hm2 nitrogen application rates.