喷洒西部豚草控制剂的牧场中的植被和动物产量

IF 0.8 Q3 AGRONOMY Crop, Forage and Turfgrass Management Pub Date : 2024-04-03 DOI:10.1002/cft2.20279
Keith Harmoney, John Jaeger, Jacob Hadle
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引用次数: 0

摘要

西部豚草(Ambrosia psilostachya DC)是美国西部牧场最常见的多年生原生草本植物之一。当西部豚草出现在牧草中时,牛会在其食物中摄入少量西部豚草,在这些牧草中,牧草的营养价值往往高于相关的禾本科成分。然而,许多生产者认为西部豚草是牧场中不受欢迎的禁草。我们进行了一项为期两年的研究,比较了喷洒 6 盎司/英亩(0.19 磅活性成分/英亩)麦草畏控制西部豚草或不喷洒麦草畏的牧场的植被和牲畜生产力。与未喷洒麦草畏的牧场相比,喷洒麦草畏能显著降低西部豚草的密度和产量(分别为 0.2 株/平方英尺和 3.5 株/平方英尺,以及 0 磅/英亩和 206 磅/英亩)。不同处理的牧草产量和植被总产量相似。在这两年的所有季中和季末取样日期,西部豚草的粗蛋白和可消化总养分都高于牧草。喷洒豚草控制剂的牧场和未喷洒豚草控制剂的牧场在任何一年的牲畜增重都没有差别,两年的平均值也没有差别(喷洒豚草控制剂的牧场和未喷洒豚草控制剂的牧场的牲畜增重分别为 189 磅/头和 188 磅/头)。每英亩的牛肉产量也相差无几。喷洒处理是一项额外开支,并没有提高饲料、草料或牲畜的总产量。由于天气模式导致西部豚草种群密度的自然波动,生产者可能不会从仅在牧场喷洒西部豚草中获益。
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Vegetation and animal production in pastures sprayed for western ragweed control

Western ragweed (Ambrosia psilostachya DC) is one of the most common perennial, native forbs of western US rangelands. Cattle consume small quantities of western ragweed in their diets when present in the forage sward, and forage nutritive value tends to be greater than the associated grass component in those swards. Yet, many producers view western ragweed as an undesirable forb in rangelands. We conducted a study over two years to compare vegetative and stocker animal productivity in pastures that were either sprayed with dicamba at 6 oz/acre (0.19 lb a.i./acre) for western ragweed control or were left unsprayed. Pastures started the study with high western ragweed densities (>9 western ragweed plants/ft2) before pasture treatment, and spraying with dicamba significantly reduced western ragweed density and yield compared to unsprayed pastures (0.2 vs. 3.5 ragweed plants/ft2, and 0 vs. 206 lb/acre, respectively). Grass production and total vegetation production were similar between treatments. Crude protein and total digestible nutrients of western ragweed was greater than grass at all mid-season and end of season sampling dates both years. Stocker animal gain was not different between pastures sprayed for ragweed control and pastures left unsprayed in either year, nor when averaged over the two years (189 vs. 188 lb/head, sprayed vs. unsprayed, respectively). Beef production per acre was also similar. The spray treatment was an added expense that did not result in greater total forage, grass, or animal production. With natural fluctuations in western ragweed population densities due to weather patterns, producers will likely experience little benefit from spraying for western ragweed alone in pasture.

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来源期刊
Crop, Forage and Turfgrass Management
Crop, Forage and Turfgrass Management Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
1.30
自引率
16.70%
发文量
49
期刊介绍: Crop, Forage & Turfgrass Management is a peer-reviewed, international, electronic journal covering all aspects of applied crop, forage and grazinglands, and turfgrass management. The journal serves the professions related to the management of crops, forages and grazinglands, and turfgrass by publishing research, briefs, reviews, perspectives, and diagnostic and management guides that are beneficial to researchers, practitioners, educators, and industry representatives.
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