Nitrogen (N) inputs to pasture systems coupled with grazing management strategies based on monitoring and control of canopy structure may provide conditions for greater productivity and enhanced forage nutritive value. This 2-year study assessed canopy structure and nutritive value responses of three pasture treatments, namely, (1) mixed Marandu palisadegrass (Brachiaria brizantha [Hochst. ex A. Rich.] R.D. Webster [syn. Urochloa brizantha Stapf]) cv. Marandu and forage peanut (Arachis pintoi Krapov. & W.C. Greg.) cv. BRS Mandobi pastures without N fertilizer (GRASS + LEGUME); (2) monoculture Marandu palisadegrass pastures fertilized with 150 kg N/ha (GRASS + N); and (3) monoculture Marandu palisadegrass without N fertilizer (GRASS). Grazing management was similar across pasture treatments, using continuous stocking and a target canopy height of 20–25 cm. Herbage mass was greater in GRASS + N and GRASS + LEGUME pastures than in GRASS in summer and spring (p = .014). The leaf:stem ratio in the grass mass (p = .731) was similar between treatments. Grass crude protein (CP) and in vitro digestible dry matter (IVDDM) were greatest in the GRASS + N pasture (p < .001). Grass neutral detergent fibre (NDF) concentration was greater at GRASS and GRASS + LEGUME pastures than in GRASS + N (p < .001). Forage peanut had a greater IVDDM and CP concentration and a lower NDF concentration than Marandu palisadegrass. Nitrogen application or the presence of the legume increased green herbage mass and improved forage nutritive value in canopies with similar height.

中文翻译：

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含或不含氮或与饲料花生混合的 Palisadegrass 牧场放牧至相似的目标冠层高度。1. 对牧草质量、冠层结构和牧草营养价值的影响

牧场系统的氮 (N) 输入与基于冠层结构监测和控制的放牧管理策略相结合，可以为提高生产力和提高草料营养价值提供条件。这项为期 2 年的研究评估了三种牧草处理的冠层结构和营养价值响应，即 (1) 混合 Marandu palisadegrass ( Brachiaria brizantha [Hochst. ex A. Rich.] RD Webster [syn. Urochloa brizantha Stapf]) cv。Marandu 和饲料花生 ( Arachis pintoi克拉波夫。＆WC格雷格。）简历。不施氮肥的 BRS Mandobi 牧场（草 + 豆类）；(2) 150 kg N/ha (GRASS + N) 施肥的单一栽培 Marandu palisadegrass 牧场；(3) 不施氮肥的单一栽培马兰杜栅栏(GRASS)。放牧管理在牧场处理中是相似的，使用连续放养和 20-25 厘米的目标树冠高度。夏季和春季，GRASS + N 和 GRASS + LEGUME 牧场的牧草质量大于 GRASS ( p  = .014)。 处理间草群中的叶茎比 ( p = .731) 相似。草粗蛋白 (CP) 和体外可消化干物质 (IVDDM) 在 GRASS + N 牧场中最高 ( p < .001）。GRASS 和 GRASS + LEGUME 牧场的草中性洗涤纤维 (NDF) 浓度高于 GRASS +  N (p  < .001)。与 Marandu palisadegrass 相比，饲料花生具有更高的 IVDDM 和 CP 浓度以及更低的 NDF 浓度。施氮或豆科植物的存在增加了绿色牧草的质量，并提高了具有相似高度的树冠的草料营养价值。