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Comprehensive evaluation of forage yield and nutritional quality in eight Bromus inermis germplasm resources

LI Yan1,2,3,LI Yu-Chen1,2,3,YU Ai-Ping1,2,3,CHEN Ai-Ping1,2,3,*   

  1. 1 College of Grassland Science, Xinjiang Agricultural University, Urumqi 830052, Xinjiang, China; 2 Key Laboratory for Western Arid Region Grassland Resources and Ecology, Ministry of Education, Urumqi 830052, Xinjiang, China; 3 Xinjiang Key Laboratory of Grassland Resources and Ecology, Urumqi 830052, Xinjiang, China
  • Received:2025-04-15 Revised:2025-08-13 Accepted:2025-08-13 Published:2025-08-25
  • Supported by:
    This study was supported by the China Agriculture Research System of MOF and MARA (CARS-34).

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Abstract:

To identify high-yielding and high-quality Bromus inermis germplasm suitable for cultivation in Xinjiang, a three-year field trial was conducted from 2022 to 2024, systematically evaluating the adaptability of eight germplasm sources. Agronomic traits, forage yield, and nutritional quality were assessed, and a comprehensive evaluation was performed using cluster analysis and grey relational analysis to screen for locally adapted superior germplasms. The results showed that the coefficient of variation across 13 traits ranged from 3.87% to 12.02%, with dry forage yield exhibiting the highest variability. In terms of agronomic performance, both plant height and stem diameter increased significantly over successive planting years. Forage yield followed a trend of increasing initially and then declining, peaking in 2023. Notably, germplasm W3 exhibited a significantly higher cumulative yield than the others over the three-year period. Quality analysis revealed that crude protein content ranged from 9.14% to 13.51% across the years, while ether extract and crude ash contents were highest in 2022. Except for W7 and W8, the neutral detergent fiber (NDF) content of the remaining germplasms increased annually. Based on grey relational analysis, W3 achieved the highest comprehensive score (0.7163) and is recommended as a preferred germplasm for Bromus inermis breeding and cultivation in Xinjiang.

Key words: Bromus inermis, agronomic traits, forage yield, nutritional quality, comprehensive evaluation

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