目的 探究核桃林下Mulato Ⅱ臂形草关键种植技术，保障本地肉牛产业饲粮稳定。 方法 在同一果园核桃林下设置Mulato Ⅱ臂形草单播、鸭茅+多年生黑麦草+白三叶组合品种混播、巨菌草单播3个处理进行对比种植试验，每个处理设置4个重复,观察生产适应性和抗逆性，测定生物产量，统计经济收益。 结果 Mulato Ⅱ在播后25 d就能成为优势种群；2022、2023年Mulato Ⅱ的鲜草产量分别为47 848.9、73 870.25 kg/hm²，比组合品种的鲜草产量高出66.9%、87.2%，而巨菌草连续2年未达测产标准；2022、2023年Mulato Ⅱ臂形草的平均年经济收益比组合品种多4 790.39元/hm² 。 结论 Mulato Ⅱ 臂形草生长速度快、抗本地草侵害能力强，耐高热高湿，常年青绿、基本无病虫害，在海拔700～1 700 m区域核桃林下，可作为高产优质牧草推广种植。

Objectives The key techniques of planting Mulato Ⅱ Brachiaria grass under walnut forests were studied to ensure a stable feed supply for the local beef cattle industry. Methods Three treatments including monoculture of Mulato Ⅱ Brachiaria grass, a mixed culture of Dactylis glomerata, perennial ryegrass, and white clover, and a monoculture of giant king grass were set up in the same walnut orchard in Longling County, Baoshan City, Yunnan Province for comparative planting experiment, with four replicates for each treatment. The production adaptability and stress resistance were observed, the biological yield was measured, and the economic benefits were calculated. Results Mulato Ⅱ was the dominant population after 25 days of sowing. The fresh grass yield of Mulato Ⅱ in 2022 and 2023 was 47 848.9 and 73 870.25 kg/hm², respectively, 66.9% and 87.2% higher than that of the mixed culture. However, the giant king grass did not meet the yield standards for two consecutive years. The average annual economic benefit of Mulato Ⅱ Brachiaria grass in 2022 and 2023 was 4 790.39 yuan/hm², higher than that of the mixed culture. Conclusions Mulato Ⅱ Brachiaria grass has a fast growth rate, strong resistance to local grass invasion, high heat and high humidity tolerance, and is green all year round with almost no pests and diseases. It can be promoted and planted as a high-yield and high-quality forage under walnut forests in areas at an altitude of 700-1 700 meters.