Alfalfa‐bermudagrass mixtures managed under contrasting harvest strategies in the southeastern US

IF 2.7 3区农林科学 Q1 AGRONOMY

Grass and Forage Science Pub Date : 2024-08-05 DOI:10.1111/gfs.12687

Justin C. Burt, Lisa L. Baxter, Liliane S. Silva, Carol M. Vasco, Christopher G. Prevatt, M. Kimberly Mullenix, R. Lawton Stewart, Jennifer J. Tucker

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引用次数: 0

Abstract

The incorporation of dual‐purpose alfalfa (Medicago sativa L.) cultivars into bermudagrass (Cynodon spp.) is a viable option to extend the grazing season in Southern forage systems. However, data are limited on which harvest management strategy (HMS) optimizes the use of alfalfa‐bermudagrass (ABG) mixtures in the Southern US. A two‐year study evaluated ABG mixtures under three HMS [cut only (CO), graze only (GO), or cut and graze (CG)].in Headland, AL and Tifton, GA. Alfalfa‐bermudagrass mixtures utilized in this evaluation were ‘Bulldog 805’ alfalfa that was interseeded into ‘Tifton 85’ bermudagrass. Treatments were evaluated for forage, animal, and total system performance. Herbage accumulation varied by year and location (p < .01), but the number of harvests ultimately determined the total forage produced. Forage allowance was never limiting but did differ among treatments at Tifton, GA (p = .02). The CG HMS allowed for similar daily (p > .06) and liveweight gains (p > .56) on fewer days of grazing as compared to the GO treatments. The greater alfalfa percentage in the CG HMS translated to greater total digestible nutrients (TDN) and crude protein (CP), though not always statistically different. The CO HMS maximized system performance when evaluated for total gain (actual gains + predicted gains). However, the CG management allowed for more production opportunities across the season, thereby reducing economic risk. Future research should focus on evaluating the economic implications of introducing each HMS into ABG systems.

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美国东南部在不同收割策略下管理的紫花苜蓿-红豆草混合物

将两用紫花苜蓿（Medicago sativa L.）栽培品种并入百慕大草（Cynodon spp.）是延长南方牧草系统放牧季节的一个可行选择。然而，在美国南部，哪种收割管理策略（HMS）能优化紫花苜蓿-百慕大草（ABG）混合物的使用，这方面的数据还很有限。一项为期两年的研究在阿拉巴马州海德兰德和佐治亚州蒂夫顿评估了三种收割管理策略（只割（CO）、只放牧（GO）或边割边放牧（CG））下的紫花苜蓿-红豆草（ABG）混合物。本次评估中使用的紫花苜蓿-百慕大草混合物是将 "Bulldog 805 "紫花苜蓿间种到 "Tifton 85 "百慕大草中。对处理进行了饲料、动物和整个系统性能的评估。不同年份和地点的垃圾累积量不同（p < .01），但收割次数最终决定了生产的总饲草量。饲料量从未受到限制，但在佐治亚州蒂夫顿，不同处理之间存在差异（p = .02）。与GO处理相比，CG HMS在较少的放牧天数下获得了相似的日增重（p > .06）和活体增重（p > .56）。CG HMS 中的紫花苜蓿比例更高，因此可消化总养分 (TDN) 和粗蛋白 (CP) 也更高，但在统计学上并不总是有差异。在评估总增重（实际增重+预测增重）时，CO HMS 使系统性能最大化。然而，CG 管理可使整个季节有更多的生产机会，从而降低经济风险。未来的研究应侧重于评估在 ABG 系统中引入每种 HMS 的经济影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Grass and Forage Science 农林科学-农艺学

CiteScore

5.10

自引率

8.30%

发文量

审稿时长

12 months

期刊介绍： Grass and Forage Science is a major English language journal that publishes the results of research and development in all aspects of grass and forage production, management and utilization; reviews of the state of knowledge on relevant topics; and book reviews. Authors are also invited to submit papers on non-agricultural aspects of grassland management such as recreational and amenity use and the environmental implications of all grassland systems. The Journal considers papers from all climatic zones.

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