The Effect of Nitrogen and Phosphorus Fertilizer Combinations on Seed Yield and Germination Ability of Native Elymus Sibiricus L During Critical Growth Period
s:To explore the effects of nitrogen and phosphorus fertilizer combinations during the critical stages of nutri-tional and reproductive growth on the seed yield and germination ability of native Elymus sibiricus L in alpine area,dif-ferent nitrogen and phosphorus fertilizer topdressing combinations were designed during the tillering-jointing and heading-flowering stages of native Elymus sibiricus L,groupsⅠ,Ⅱ,Ⅲ,Ⅳ,and Ⅴ were treated with Urea+Urea=75 kg/hm2+75 kg/hm2,Urea+SSP=75 kg/hm2+150 kg/hm2,SSP+SSP=150 kg/hm2+150 kg/hm2,SSP+Urea=150 kg/hm2+75 kg/hm2,DAP+DAP=150 kg/hm2+150 kg/hm2,respectively,and group Ⅵ without topdressing.This paper studied their effects on seed yield,yield components,and seed germination ability of native Elymus sibiricus L.The results showed that the ap-plication of DAP+DAP(group Ⅴ),SSP+Urea(group Ⅳ),and Urea+SSP(group Ⅱ)fertilization combinations during the tillering-jointing stage and heading-flowering stage increased the potential seed yield,apparent seed yield,and measured seed yield of Elymus sibiricus L by increasing the number of panicles/plant,tillers,reproductive branches,spikelets per spike,seeds/spike,and small flowers/spike,and also improved the seed germination potential,germination index,and vitality index.Compared to the control,the seed yield of groups Ⅴ,Ⅳ,and Ⅱ increased by 569.21 kg/hm2,420.07 kg/hm2,and 363.05 kg/hm2,the seed germination potential increased by 27.13%,29.78%and 27.13%,the ger-mination index increased by 28.26%,19.37%and 23.51%,and the vitality index increased by 47.85%,44.19%and 49.51%,respectively.The seed yield of Elymus sibiricus L was significantly positively correlated with the number of spikes/plant,reproductive branches,tillers,spikelets/spike,flowers/spike and seeds/spike,and positively correlated with spike length and seed thousand grain weight.In summary,spikes/plant,tillers and reproductive branches are the main fac-tors affecting the seed yield of native Elymus sibiricus L.Timely topdressing N-P binary fertilizers or interactive applica-tion of N and P fertilizers from tillering to jointing stage and heading to flowering stage can significantly increase main seed yield factors of Elymus sibiricus L,enhance seed yield and improve its germination ability.
国家科技期刊平台
NSTL
万方数据
