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Interseeding annual warm-season grasses into pastures: Forage nutritive value and yields
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-03-16 , DOI: 10.1002/agj2.20653
John A. Guretzky 1 , Keith R. Harmoney 2 , Joseph L. Moyer 3 , Jerry D. Volesky 4 , Mitchell B. Stephenson 5
Affiliation  

Interseeding annual warm-season grasses into pastures often increases forage accumulation. Yet, impacts on nutritive value and yields remain unreported. We analyzed forage collected from five Nebraska and Kansas experiments in 2015–2016 (eight environments) for crude protein (CP), neutral detergent fiber (NDF), and in vitro organic matter digestibility (IVOMD) concentrations and yields. Each experiment subjected perennial cool-season grasses to two harvest frequencies (once at 90 d and twice at 45 and 90 d after interseeding) and four interseeded annual warm-season grass types–pearl millet [Pennisetum glaucum (L.) R. Br.], sudangrass [Sorghum bicolor (L.) Moench ssp. drummondii (Nees ex Steud) de Wet & Harlan], a sorghum–sudangrass hybrid (S. bicolor × S. bicolor var. sudanense), and an unseeded control. Across environments, 90-d CP and IVOMD concentrations increased while CP and IVOMD yields decreased in interseeded pastures when harvested twice, indicating presence of nutritive value-yield tradeoffs. Pastures interseeded with sorghum–sudangrass had greater 90-d IVOMD concentrations and CP and IVOMD yields when harvested once but only greater 90-d IVOMD concentrations when harvested twice compared to unseeded pastures. Interseeding sorghum–sudangrass provided an effective strategy to increase CP and IVOMD yields in late summer in humid environments with tall fescue [Schedonorus arundinaceus (Schreb.) Dumort., nom. cons.] and in mid- and late summer in humid environments with smooth bromegrass (Bromus inermis Leyss.) and semiarid environments with western wheatgrass [Pascopyrum smithii (Rydb.) Á. Löve]. Interseeding annual warm-season grasses did not consistently increase CP and IVOMD yields in semiarid environments with smooth bromegrass and crested wheatgrass [Agropyrum cristatum (L.) Gaertn.].

中文翻译:

将一年生暖季草种入牧场:草料的营养价值和产量

将一年一度的暖季草种入牧场通常会增加草料的积累。然而,对营养价值和产量的影响仍未报告。我们分析了从 2015 年至 2016 年(八个环境)内布拉斯加州和堪萨斯州的五个实验中收集的粗蛋白(CP)、中性洗涤纤维(NDF)和体外有机物质消化率(IVOMD)浓度和产量。每个实验对多年生冷季草进行两次收获频率(一次在 90 天,两次在 45 和 90 d 间种后)和四种间种一年生暖季草类型——珍珠粟 [ Pennisetum glaucum (L.) R. Br. ], sudangras [ Sorghum bicolor (L.) Moench ssp. drummondii (Nees ex Steud) de Wet & Harlan],一种高粱-苏丹草杂交种(S. bicolor  ×  S. bicolor var. sudanense)和未播种的对照。在不同环境中,当收获两次时,混种牧场的 90 天 CP 和 IVOMD 浓度增加,而 CP 和 IVOMD 产量下降,表明存在营养价值 - 产量权衡。与未播种的牧场相比,与高粱-苏丹草混种的牧场在收获一次时具有更高的 90 天 IVOMD 浓度和 CP 和 IVOMD 产量,但在收获两次时仅具有更高的 90 天 IVOMD 浓度。高粱-苏丹草间种提供了一种有效的策略,可在夏末在高羊茅的潮湿环境中提高 CP 和 IVOMD 的产量 [ Schedonorus arundinaceus(Schreb.) Dumort., nom. cons.] 和在夏季中后期在潮湿环境中生长,有光滑的雀麦草 ( Bromus inermis Leyss.) 和半干旱环境中生长着西部小麦草 [ Pascopyrum smithii (Rydb.) Á. 爱]。在具有光滑雀麦草和凤头小麦草的半干旱环境中,一年生暖季型牧草并没有持续增加 CP 和 IVOMD 的产量 [ Agropyrum cristatum (L.) Gaertn.]。
更新日期:2021-03-16
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