接种高效根瘤菌对紫花苜蓿—禾本科混播组合生产性能的影响

Effect of inoculating highly effective Sinorhizobium meliloti on productivity of gramineous grass/alfalfa mixtures

利用筛选的高效根瘤菌接种紫花苜蓿,分别与高羊茅、无芒雀麦及1年生黑麦草混播。与对照相比,接种高效根瘤菌后,紫花苜蓿-高羊茅混播组合中苜蓿干草增产17.0%,高羊茅增产15.1%,总计增产16.3%;紫花苜蓿-无芒雀麦混播组合中紫花苜蓿增产14.0%,无芒雀麦增产51%,总生物量增产20.5%;紫花苜蓿-1年生黑麦草混播组合中,紫花苜蓿增产7.6%,1年生黑麦草干草产量比对照增产4.8%,总生物量增产6.8%。从LER(Land equivalent ratio)和CR(Competitive ratio)变化看,接种高效根瘤菌有利于提高LER值和禾本科作物的CR值。

Highly effective Sinorhizobium meliloti was inoculated to alfalfa （Medicago sativa L. ） which was planted with tall fescue （F. arundinacea Schreb）, smooth bromegrass （Bromus inermis Leyss. ） and ryegrass （L. multiflorum Lain. ） to establish gramineous grass/alfalfa mixtures. Compared with the control （uninoculating treatment）, in alfalfa/tall fescue mixture, the biomass yield of alfalfa was increased by 17%, that of tall fescue was increased by 15.1%, and the total yield was increased by 16.3 % ; in alfalfa/smooth bromegrass mixture, the biomass yield of alfalfa was increased by 14.0 %, that of smooth bromegrass was increased by 51.0 %, and the total yield was increased by 20.5 % ; in alfalfa/ryegrass mixture, the biomass yield of alfalfa was incraesed by 7.6 %, that of ryegrass was increased by 4.8 % , and the total biomass yield was increased by 6.8 %. The results indicated that inoculating highly effective Sinorhizobium meliloti could increase the LER （Land equivalent ratio） and the CR（Competitive ratio） of grass crops.