豆禾混播草地翌年头茬草生产性能与品质综合评价OA

Establishing high-yielding,high-quality legume-grass mixtures is an effective approach to reduc-ing pressure on natural grasslands and supporting ecological restoration and sustainable livestock production in the semiarid agro-pastoral ecotone of Inner Mongolia.To identify a suitable mixing ratio of alfalfa(Medicago sativa)and smooth bromegrass(Bromus inermis)for local conditions,a randomized block design was used with five treatments:alfalfa monoculture(M),smooth bromegrass monoculture(W),and three alfalfa∶smooth brome-grass mixtures at seeding ratios of 1∶2(M1W2),2∶1(M2W1),and 5∶4(M5W4).Agronomic traits,forage yield,and nutritional quality of the first cut in the year after sowing were measured and comprehensively evalu-ated using grey relational analysis.Under M2W1,alfalfa had the highest stem dry weight,leaf dry weight,hay yield,and calcium content,at 68.53 g/m²,44.45 g/m²,5 736.00 kg/hm²,and 16.47 g/kg,respectively.Smooth bromegrass under M2W1 had the highest plant height,crude fat content,stem-to-leaf ratio,and phos-phorus content,at 53.89 cm,4.78%,1.33,and 3.58 g/kg,respectively.Within the mixtures,alfalfa yield increased as its seeding proportion increased(M2W1>M5W4>M1W2),whereas smooth bromegrass yield decreased(M1W2>M5W4>M2W1).Among the mixed treatments,M2W1 had the highest weighted grey rela-tional grade,indicating that this ratio improved the overall production performance of the first cut in the year after sowing and may be a suitable mixture ratio for the region.These findings are based on first-cut observations in the year after sowing,and the long-term effects require further verification through continued field monitoring.