The nutritive value of sown binary- and multi-species grassland mixtures may differ from the values expected based on single-species swards of their constituent species. Field plots were established in a split-plot design to assess the nutritive value of binary- and multi-species mixtures compared to single-species swards of three grass species and red clover (RC) ( Trifolium pratense L.) managed for intensive silage production. The nutritive value of grass–legume binary mixtures reflected the values of the constituent species grown on their own, and thus may be predicted from monoculture values. The relatively low digestibility (dry matter digestibility [DMD]) and crude protein (CP) content of the Italian ryegrass ( Lolium multiflorum L.) sward compared to perennial ryegrass ( Lolium perenne L.) and timothy ( Phleum pratense L.) suggests that it may have a limited role in binary- or multi-species swards. Herbage nutritive value in the multi-species swards (Mix 1: perennial ryegrass, timothy, RC and white clover [ Trifolium repens L.]; Mix 2: perennial ryegrass, timothy, RC, ribwort plantain [ Plantago lanceolata L.] and chicory [ Cichorium intybus L.]) appeared to be influenced more by the presence of legumes than herbs. Compared to perennial ryegrass, the multi-species swards had a slower rate of DMD decline prior to Cut 1, but subsequently had lower DMD values at the mid-season harvests. Both multi-species mixtures exhibited DMD, water-soluble carbohydrate (WSC) and CP values that would not have been predicted from their constituent species and thus need to be measured on herbage from field plots growing these mixtures.

中文翻译：

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集约化青贮系统中二元和多物种草料相对于单物种草料的牧草营养价值

播种的二元和多物种草地混合物的营养价值可能不同于基于其组成物种的单一物种草坪的预期值。在裂地设计中建立田间地块，以评估与三种草种和红三叶草 (RC) (Trifolium pratense L.) 的单一物种草皮相比，二元和多物种混合物的营养价值，用于集约化青贮生产. 草豆科植物二元混合物的营养价值反映了其自身生长的组成物种的价值，因此可以从单一栽培价值预测。与多年生黑麦草 (Lolium perenne L.) 和提摩西草 (Phleum pratense L.) 相比，意大利黑麦草 (Lolium multiflorum L.) 草料的消化率（干物质消化率 [DMD]）和粗蛋白 (CP) 含量相对较低。) 表明它在二元或多物种草丛中的作用可能有限。草本植物在多品种草丛中的营养价值（组合 1：多年生黑麦草、梯牧草、RC 和白三叶草 [Trifolium repens L.]；组合 2：多年生黑麦草、梯牧草、RC、车前草 [Plantago lanceolata L.] 和菊苣 [ Cichorium intybus L.]) 似乎更多地受到豆类的影响而不是草药。与多年生黑麦草相比，多品种黑麦草在切割 1 之前的 DMD 下降速度较慢，但​​随后在中期收获时具有较低的 DMD 值。两种多物种混合物都表现出 DMD、水溶性碳水化合物 (WSC) 和 CP 值，这些值无法从其组成物种预测，因此需要在种植这些混合物的田间地块的牧草上进行测量。