Reduced-lignin alfalfa production in the water-limited environments of the US Central Great Plains

IF 2 3区农林科学 Q2 AGRONOMY

Agronomy Journal Pub Date : 2025-05-12 DOI:10.1002/agj2.70064

Alayna Gerhardt, Romulo Lollato, Andrew Foote, Carla Goad, Alexandre Caldeira Rocateli

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Abstract

Previous studies indicate reduced-lignin (RL) alfalfa (Medicago sativa L.) cultivars as a more digestible livestock feed option with minimal reductions in biomass than conventional alfalfa cultivars at the same growth stage, allowing for harvest flexibility. However, these findings are derived from environments with adequate moisture. Thus, RL performance in water-limited environments, such as the US's Central Great Plains (CGP), is unknown. Our objective was to compare the 54HVX41 cultivar's (RL) season-long biomass and nutritive value against three reference alfalfa cultivars (54VR10, DKA44-16RR, and WL 356 HQ.RR) at different harvest intervals (i.e., 28, 35, and 48 days) at three locations for two seasons in the CGP. In locations that received adequate annual rainfall (near Lahoma, OK), RL alfalfa had similar or lower season-long biomass (p = 0.02), acid detergent lignin (ADL) concentration (p > 0.01), greater neutral detergent fiber digestibility 30 h (p < 0.01), and in vitro dry matter digestibility 48 h (IVTDMD 48 h) than the reference cultivars (p > 0.01). Nevertheless, in water-limited environments (near Hutchinson, KS, and Stillwater, OK), the RL had similar season-long biomass, ADL, and IVTDMD 48 h concentrations to the reference cultivars. Further research is needed to validate our interpretation, as only one RL alfalfa cultivar was evaluated in water-deficit environments.

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美国中部大平原缺水环境下木质素减少的紫花苜蓿产量

先前的研究表明，在相同的生长阶段，还原性木质素（RL）苜蓿（Medicago sativa L.）品种作为一种更易消化的牲畜饲料选择，其生物量比传统苜蓿品种减少最少，允许收获灵活性。然而，这些发现是在水分充足的环境下得出的。因此，RL在诸如美国中部大平原（CGP）等水资源有限的环境中的表现尚不清楚。我们的目的是比较54HVX41品种（RL）与三个参考苜蓿品种（54VR10、DKA44-16RR和WL 356 HQ.RR）在不同收获间隔（即28、35和48天）下在CGP三个地点的两个季节的全季生物量和营养价值。在年降雨量充足的地区（俄克拉荷马附近），RL紫花苜蓿具有相似或更低的季节生物量（p = 0.02），酸性洗涤木质素（ADL）浓度(p >；0.01)， 30 h中性洗涤纤维消化率较高(p <；0.01)，体外干物质消化率48 h （IVTDMD 48 h）高于对照品种(p >；0.01)。然而，在水资源有限的环境中（靠近堪萨斯州的Hutchinson和OK的Stillwater）， RL具有与参考品种相似的全季生物量、ADL和IVTDMD 48 h浓度。由于只有一个RL苜蓿品种在缺水环境下进行了评估，因此需要进一步的研究来验证我们的解释。

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

Agronomy Journal 农林科学-农艺学

CiteScore

4.70

自引率

9.50%

发文量

265

审稿时长

4.8 months

期刊介绍： After critical review and approval by the editorial board, AJ publishes articles reporting research findings in soil–plant relationships; crop science; soil science; biometry; crop, soil, pasture, and range management; crop, forage, and pasture production and utilization; turfgrass; agroclimatology; agronomic models; integrated pest management; integrated agricultural systems; and various aspects of entomology, weed science, animal science, plant pathology, and agricultural economics as applied to production agriculture. Notes are published about apparatus, observations, and experimental techniques. Observations usually are limited to studies and reports of unrepeatable phenomena or other unique circumstances. Review and interpretation papers are also published, subject to standard review. Contributions to the Forum section deal with current agronomic issues and questions in brief, thought-provoking form. Such papers are reviewed by the editor in consultation with the editorial board.