河套灌区盐碱地饲用燕麦生产性能综合评价OA

To identify suitable forage oat cultivars and determine the optimal cutting stage for saline alkali soils in the Hetao Irrigation District,14 domestic and foreign forage oat cultivars were evaluated.Dif-ferences in yield,forage quality,and digestibility characteristics were analyzed across different growth stages,and comprehensive screening was conducted using grey relational analysis.The results showed that plant height differed significantly among cultivars and growth stages,and all cultivars exhibited an"S"shaped growth curve.In terms of cultivar main effects,fresh forage yield and hay yield ranged from 21 451.67 to 38 916.53 kg/hm2 and from 5 620.76 to 8 359.18 kg/hm2,respectively.The crude protein(CP)contents of the'Leader'(Souris),'Baler'and'Baler No.2'exceeded 10.00%of dry matter(DM)and were significantly higher than those of other varieties except'Yellow oat'.The neutral detergent fiber(NDF)contents of'Baler','Baler No.2',and'Yellow oat'was significantly lower than those of most other varieties,except'Leader'(Souris).The acid detergent fiber(ADF)contents of'Leader'(Souris),'Baler',and'Baler No.2'were significantly lower than those of other cultivars,except'Yellow oat',while acid detergent lignin(ADL)content was lowest in'Haymaker','Baler',and'Helios'.'Hay-maker'had the highest ether extract(EE)content.Regarding cutting stage,hay yield and dry to fresh ratio followed the order milk stage>flowering stage>heading stage.At the flowering stage,fresh forage yield and water-soluble carbohydrate(WSC)content were highest,while CP,dNDF30,dNDF48,NDFD30,NDFD48,IVTDMD30,and IVTDMD48 were second only to those at the heading stage.ADL content was also significantly lower at flowering than at the milk stage.The relative feed quality(RFQ)values of'Hay-maker'and'Baler'were significantly higher than those of all other cultivars except'Leader'(Souris).Gray relational analysis showed that NDF,IVTDMD48,ash,dNDF30,and IVTDMD30 ranked as the top five weighted indicators.Both equal weight and weighted correlation degrees ranked'Baler','Haymaker',and'Leader'(Souris)among the top three cultivars.In conclusion,NDF was the primary indicator for evaluating the production performance of forage oats in saline alkali soils of the Hetao Irrigation District.'Baler','Hay-maker',and'Leader'(Souris)showed the best overall performance and were suitable for cultivation in this region.The flowering stage provided the best comprehensive production performance and was recommended at the optimal cutting stage.