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The effects of a blend of coriander oil, eugenol, geranyl acetate, and geraniol on bull fattening and slaughter performance. 芫荽油、丁香酚、乙酸香叶酯和香叶醇混合物对公牛育肥和屠宰性能的影响。
Pub Date : 2024-01-26 DOI: 10.31220/agrirxiv.2024.00230
D. Brugger, J. Salzmann, A. Liesegang, M. Schick, R. Bolt
A blend of essential oils (eugenol, geranyl acetate, coriander oil) has been earlier shown to improve dairy cow productivity by means of reduced methanogenesis. Thus far, no data is available for beef cattle and a transfer of lessons learned from dairy cows to bulls is difficult. The present study tested the material according to manufacturer instruction in beef bulls under Swiss rearing conditions. No effect on zootechnical or slaughter performance could be confirmed, despite a multitude of earlier positive reports from dairy trials. This questions the suitability of the product under the simulated conditions. Further studies including dose-response studies and considering different roughage:concentrate ratios are urgently needed.
早先的研究表明,混合精油(丁香酚、乙酸香叶酯、芫荽油)可通过减少甲烷生成来提高奶牛的生产率。到目前为止,还没有关于肉牛的数据,因此很难将从奶牛身上学到的经验移植到公牛身上。本研究按照生产商的说明,在瑞士饲养条件下对肉牛进行了测试。尽管早先有大量奶牛试验的正面报告,但无法证实对动物技术或屠宰性能有任何影响。这就对该产品在模拟条件下的适用性提出了质疑。我们急需开展进一步的研究,包括剂量反应研究,并考虑不同的粗饲料与精饲料比例。
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引用次数: 0
How do crop varieties developed through different breeding methods perform in field in terms of yield and biotic and abiotic stress? A systematic map protocol. 通过不同育种方法培育的作物品种在田间的产量、生物和非生物胁迫方面表现如何?系统地图协议。
Pub Date : 2024-01-26 DOI: 10.31220/agrirxiv.2024.00228
Neal Haddaway, Ram Khadka, G. Chimwaza, Mercy Moyo, Marcia Mabhula, S. Savilaakso
Background: Despite Nepal's considerable progress towards sustainable development goals in recent years, much more needs to be done to address the key development challenges. Agriculture plays an indispensable role in Nepal's development trajectory, but Nepal faces complex challenges in its agricultural landscape. Addressing these challenges requires a coordinated effort and the use of robust scientific evidence to support decision making - knowledge on effectiveness of crop varieties will help to direct support and resources where they are needed most. Despite heavy investment in seed technology, benefits to crop productivity and farmer income have been limited. Changing weather patterns and an overreliance on imported crops have led to a potentially fragile system. There is therefore a need for an overview of what research is being invested in, along with information about the effectiveness of new crop varieties, including imports. Methods: This systematic map will collate the literature from Nepal and its neighbouring countries to answer the question: "How do crop varieties developed through different breeding methods perform in field in terms of yield and biotic and abiotic stress?". We will search for evidence across a suite of bibliographic databases and grey literature resources using a tried-and-tested search strategy. Potentially relevant records will be screened against a set of a priori, explicit eligibility criteria, ensuring consistency in application prior to use. Relevant records will proceed to meta-data extraction and coding, followed by visualisation and narrative description of the evidence base as a whole. Knowledge gaps and clusters will be identified across pairs of variables including crop, breeding method, country and measurement methods to assess the volume and quality of evidence across the evidence base. This process will highlight areas where further research is needed, along with topics for which sufficient evidence exists to allow full synthesis of study findings in answer to questions regarding the effectiveness of different plant breeding methods in terms of yield and stress tolerance.
背景:尽管近年来尼泊尔在实现可持续发展目标方面取得了长足进步,但要应对主要的发展挑战,还有许多工作要做。农业在尼泊尔的发展轨迹中发挥着不可或缺的作用,但尼泊尔在农业领域面临着复杂的挑战。应对这些挑战需要协调努力,并利用可靠的科学证据来支持决策--了解作物品种的有效性将有助于把支持和资源用在最需要的地方。尽管对种子技术进行了大量投资,但对作物生产率和农民收入产生的效益有限。不断变化的天气模式和对进口作物的过度依赖导致了系统的潜在脆弱性。因此,有必要对正在进行的研究投资以及包括进口在内的农作物新品种的有效性进行概述。方法:本系统地图将整理尼泊尔及其邻国的文献,以回答以下问题:"通过不同育种方法培育出的作物品种在田间的产量、生物和非生物胁迫方面表现如何?我们将采用一套久经考验的搜索策略,在一系列文献数据库和灰色文献资源中搜索证据。我们将根据一套先验的、明确的资格标准筛选潜在的相关记录,确保在使用前应用的一致性。相关记录将进行元数据提取和编码,然后对整个证据库进行可视化和叙述性描述。将根据作物、育种方法、国家和测量方法等变量对知识差距和知识群组进行识别,以评估整个证据库中证据的数量和质量。这一过程将突出需要进一步研究的领域,以及有足够证据可以全面综合研究结果的主题,以回答不同植物育种方法在产量和抗逆性方面的有效性问题。
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引用次数: 0
Multivariate logarithmic modeling of grain production in the Yangtze River Basin: incorporating extreme weather factors. 长江流域粮食产量的多元对数模型:纳入极端天气因素。
Pub Date : 2024-01-17 DOI: 10.31220/agrirxiv.2024.00227
Zi-jun Mu
Whilst essential to the nutrition of societies, grain crops are demonstrated to be largely susceptible to the influence of anthropological climate change and extreme weather. However, few previous attempts at modeling grain yield took thorough consideration about the potential impact of extreme temperature events (ETEs) on average (or per-hectare) grain yield. From historical data in a Chinese agriculture hub, namely the Middle-Lower Yangtze Plains (MLYP) region, through a 2-step, nested OLS-FGLS multivariate log-log regression model, this study underscored the strong, sustained and significant negative influence ETEs had on grain production in the last 32 years in MLYP provinces of Jiangsu, Zhejiang, Anhui, Jiangxi, Hubei, and Hunan; supported the literature with further evidence of global warming reducing crop productivity; and corroborated previous studies highlighting a reduction in crop productivity sourced from inefficient distribution and management of labor in the context of technological advancements. Climate-model-based provincial predictions through Shared Socioeconomic Pathways (SSPs) indicate a strong need for agricultural workers and scientists to address the increasing threat of future heat and cold stress through both micro-level (such as genomics-assisted breeding) and macro-level (such as AI-mediated farm management tools), in order for them to be prepared for a wide range of climate change scenarios.
粮食作物虽然对社会营养至关重要,但已被证明在很大程度上易受人类气候变化和极端天气的影响。然而,在谷物产量建模方面,以往的尝试很少全面考虑极端温度事件(ETEs)对平均(或每公顷)谷物产量的潜在影响。本研究从中国农业中心--长江中下游平原(MLYP)地区的历史数据出发,通过两步嵌套 OLS-FGLS 多元对数回归模型,强调了过去 32 年中极端气温事件对江苏、浙江、安徽、江西、湖北和湖南等长江中下游平原省份粮食产量的强烈、持续和显著的负面影响;为文献提供了全球变暖降低作物生产率的进一步证据;并证实了之前的研究,即在技术进步的背景下,劳动力分配和管理效率低下导致作物生产率下降。通过 "共享社会经济路径"(SSPs)进行的基于气候模型的省级预测表明,农业工作者和科学家亟需通过微观层面(如基因组学辅助育种)和宏观层面(如以人工智能为媒介的农场管理工具)来应对未来日益严重的冷热胁迫威胁,以便为各种气候变化情景做好准备。
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引用次数: 0
Effect of plant spacing and harvesting age on morphological characteristics and yield of Desho grass ( Pennisetum glaucifolium L.) at Adola sub-site of Bore Agricultural Research Center, Oromia Region, Ethiopia. 埃塞俄比亚奥罗米亚地区博尔农业研究中心阿多拉分基地的株距和收割年龄对德绍草(Pennisetum glaucifolium L.)形态特征和产量的影响。
Pub Date : 2023-12-18 DOI: 10.31220/agrirxiv.2023.00222
T. Jabessa, Takele Wolkaro, Meseret Girma
This study was carried out in the Adola sub-site of the Bore Agricultural Research Centre in order to assess the effects of suitable harvesting age and plant spacing on the morphological traits and yield of Desho grass. Randomized complete block design (RCBD) with 3*3 factorial configurations in three replications was used to set up the experiment. The experiment makes use of three plant spacing (10, 30 and 50 cm) and three harvesting stages (75, 105, and 135 days). Prior to planting 100 kg/ha -1 combinations of Nitrogen, phosphate and sulfur (NPS) fertilizer were applied to all plots. The data collected from the study includes morphological characteristics such as; plant height (PH), leaf length per plant (LLPP), number of leaves per plant (NLPP), number of tillers per plant (NTPP), Leaf to steam ratio (LSR), dry matter yield (DMY), survival rate (SR), Plot cover (PC), and vigorousity. All data were subjected to GLM ANOVA procedures of SAS, 2002 version 9.0. The results revealed that all morphological characteristics were significantly (p < 0.01) affected by the treatments except leaf to steam ratio and plot cover The minimum mean number of tiller per plant (NTPP) of 21.53 was obtained from 10*75 treatments while the maximum number of tiller per plant (NTPP) of 59.3 was recorded from 50*135 treatments. The highest plant height (100.43 cm) was recorded from 30*105 treatments, while the lowest plant height was obtained from 30*75 treatments. The highest (31.87) dry matter yield tone per hectare was recorded from 30*105 while the lowest (4.4) were obtained from 50*75 treatments. It is possible to draw the conclusion that, in the current experiment near Adola, the treatment combination of 30 cm*105 days has produced the best production and nutritional values of Desho grass. To reach trustworthy results, more research on various combinations of harvesting stage and plant spacing across years and regions is necessary.
本研究在博尔农业研究中心的阿多拉分中心进行,目的是评估适宜的收割年龄和株距对德绍草形态特征和产量的影响。试验采用随机完全区组设计(RCBD),3*3 因子配置,三次重复。试验采用了三种株距(10 厘米、30 厘米和 50 厘米)和三个收获期(75 天、105 天和 135 天)。种植前,所有地块都施用了 100 公斤/公顷-1 的氮、磷、硫(NPS)复合肥。研究收集的数据包括形态特征,如株高(PH)、单株叶长(LLPP)、单株叶片数(NLPP)、单株分蘖数(NTPP)、叶蒸比(LSR)、干物质产量(DMY)、成活率(SR)、植株覆盖率(PC)和活力。所有数据均采用 SAS 2002 年 9.0 版的 GLM 方差分析程序。结果表明,除了叶蒸比和小区覆盖率外,所有形态特征都受到处理的显著影响(p < 0.01)。10*75 处理的平均单株分蘖数(NTPP)最少,为 21.53 个,而 50*135 处理的平均单株分蘖数(NTPP)最多,为 59.3 个。30*105 处理的株高最高(100.43 厘米),而 30*75 处理的株高最低。30*105 处理的每公顷干物质产量最高(31.87),而 50*75 处理的每公顷干物质产量最低(4.4)。由此可以得出结论,在目前阿多拉附近的试验中,30 厘米*105 天的处理组合产生了最佳的德绍草产量和营养价值。为了得出值得信赖的结果,有必要对不同年份和地区的收割阶段和株距的各种组合进行更多研究。
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引用次数: 0
Analysis of the genotype through interactions with the environment and dry matter yield stability of Lablab purpureus L. in midland of Guji zone. 通过与环境的交互作用分析基因型与古吉拉特中原地区L. Lablab purpureus L.干物质产量的稳定性。
Pub Date : 2023-12-18 DOI: 10.31220/agrirxiv.2023.00221
T. Jabessa, Getachew Tesfaye, Ketema Bekele
The purpose of the study was to assess Lablab genotyping performance in different Guji midland areas. A 3mx2m plot was used to seed twelve accessions of Lablab purpureus , which were obtained from the International Livestock Research Institute Gene Bank, and a tick registered variety from Bako Agricultural Research Centre. During the main rainy season in 2021-2022, three locations-Dufa, Gobicha, and Kiltu sorsa, Adola subsite, and on farms in two (2) consecutive years, respectively were studied using randomized complete block designs (RCBD) with three replications. Information was gathered regarding the establishment, duration of various physiological stages, dry matter yield of fodder, chemical compositions, and additional relevant factors. AMMI and the SAS statistical analysis programmer, version (2002), were used to perform an analysis of variance on the gathered data. The list significant difference test was used to compare the means. The results of the AMMI analysis of variance for forage dry matter yield showed that there were substantial (P < 0.01) variations in genotype and environment, but not in the effects of the G x E interaction. Both the representative testing site and the testing conditions (Adola Woyu and Kiltu Sorsa) were quite good at differentiating genotypes. The combined analysis data revealed non-significant (P > 0.05) differences for plant height and thousand seed weight, but significant (P ≤ 0.05) differences for days to flowering, days to maturity, number of branches, leaf to steam ratio, number of pods, and number of seeds across the tested environments. The results showed that, out of all the examined locations, G-11620 (15.43 t/ha) and G-14486 (11.12 t/ha) had the highest forage dry matter production. It was observed that the leaf to steam ratio was higher in both G-11486 and G-11620. All chemical compositions across tested genotypes were found to be significantly different (p ≤ 0.05) in the study of composite chemical compositions, with the exception of DOMD and IVDMD, which did not reveal significant (p >0.05) variations among genotypes. The recorded CP content ranged from 21.15% for G-14486 to 23.50% for G-11620, with the lowest value coming from typical cheek Gabis 10.8%. The highest and the lowest NDF were recorded from G-11620 (11.2%) and Gabis (22.23%) respectively. Generally the mean performance, yield and stability of the G-11620 and G-14486 were high and stable across the tested locations. Therefore, genotypes (G-14486 and G-11620) were promoted to VVT for further evaluation and possible for release.
这项研究的目的是评估古吉不同中原地区的马铃薯基因分型性能。研究人员在一块3米x2米的土地上播种了12个从国际家畜研究所基因库获得的Lablab purpureus品种,以及一个从Bako农业研究中心获得的蜱注册品种。在 2021-2022 年的主要雨季期间,采用随机完全区组设计(RCBD)和三次重复的方法,分别在阿多拉子站点的三个地点--杜法、戈比查和基尔图索萨,以及连续两(2)年的农场进行了研究。研究收集了有关禾本科植物的生长情况、各生理阶段的持续时间、饲料干物质产量、化学成分以及其他相关因素的信息。使用 AMMI 和 SAS 统计分析程序(2002 年版)对收集的数据进行方差分析。采用列表显着差异检验来比较平均值。牧草干物质产量的 AMMI 方差分析结果表明,基因型和环境的差异很大(P < 0.01),但 G x E 交互作用的影响不大。具有代表性的试验地点和试验条件(Adola Woyu 和 Kiltu Sorsa)都能很好地区分基因型。综合分析数据显示,植株高度和种子千粒重的差异不显著(P > 0.05),但开花天数、成熟天数、分枝数、叶蒸比、荚果数和种子数的差异显著(P ≤ 0.05)。结果表明,在所有受试地点中,G-11620(15.43 吨/公顷)和 G-14486(11.12 吨/公顷)的牧草干物质产量最高。据观察,G-11486 和 G-11620 的叶蒸比都较高。在复合化学成分的研究中,除了 DOMD 和 IVDMD 在不同基因型之间没有显著差异(p >0.05)外,所有受试基因型的化学成分都有显著差异(p ≤ 0.05)。记录的 CP 含量从 G-14486 的 21.15% 到 G-11620 的 23.50%,最低值来自典型的 cheek Gabis 10.8%。G-11620(11.2%)和加比斯(22.23%)的 NDF 分别最高和最低。总体而言,G-11620 和 G-14486 的平均表现、产量和稳定性在各个测试地点都很高且稳定。因此,基因型(G-14486 和 G-11620)被推广到 VVT 进行进一步评估,并有可能被释放。
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引用次数: 0
Resolving inconsistencies in environmental impact assessments of organic farming: a comparison of two meta-analyses. 解决有机农业环境影响评估中的不一致问题:两项元分析的比较。
Pub Date : 2023-11-30 DOI: 10.31220/agrirxiv.2023.00216
Hikaru Komatsu, Jeremy Rappleye
CONTEXT: In the midst of the growing popularity of organic farming, persistent questions surround its environmental effects. A 2017 meta-analysis suggested elevated acidification and eutrophication potentials per land area for organic farming relative to conventional farming, influencing policy and individual choices. However, a recent 2023 meta-analysis contradicted these findings, revealing reduced or comparable impacts across various environmental indicators, including acidification and eutrophication potentials. OBJECTIVE: These discrepant findings from these studies highlight the need for a comprehensive understanding of the underlying causes and implications. This study seeks to unravel the source of these disparities. METHODS: Initially, we scrutinized whether the differences in findings could be attributed to variations in the agricultural products selected for analysis. Subsequently, we explored the possibility that disparities were influenced by distinct averaging methods employed in the two studies. To address the impact of sample size, our investigation considered whether differences in findings could be attributed to varying sample sizes. RESULTS AND CONCLUSIONS: This study reveals that the disparities between these meta-analyses stem from differences in averaging methods and sample sizes. The 2023 meta-analysis, employing a more robust averaging method and a larger sample size, emerges as a more reliable source of information. Researchers are encouraged to incorporate the 2023 findings into their investigations, potentially necessitating a reconsideration of agricultural policies and dietary choices to align with updated environmental impact assessments. SIGNIFICANCE: By resolving inconsistencies in environmental impact assessments of organic farming, this study facilitates more effective societal and individual decision-making for greater sustainability.
背景:在有机农业日益普及的同时,围绕其环境影响的问题却始终存在。2017 年的一项荟萃分析表明,与传统农业相比,有机农业单位土地面积的酸化和富营养化潜力更高,从而影响了政策和个人的选择。然而,最近一项 2023 年的荟萃分析却与这些发现相矛盾,它揭示了各种环境指标(包括酸化和富营养化潜能值)的影响降低或相当。目标:这些研究结果的差异凸显了全面了解其根本原因和影响的必要性。本研究旨在揭示这些差异的根源。方法:首先,我们仔细研究了研究结果的差异是否可归因于分析所选农产品的不同。随后,我们探讨了差异受两项研究采用的不同平均方法影响的可能性。针对样本量的影响,我们的调查考虑了研究结果的差异是否可归因于不同的样本量。结果和结论:本研究表明,这些荟萃分析之间的差异源于平均方法和样本量的不同。2023 年的荟萃分析采用了更稳健的平均方法和更大的样本量,是更可靠的信息来源。我们鼓励研究人员将 2023 年的研究结果纳入他们的调查中,这可能需要重新考虑农业政策和饮食选择,以便与最新的环境影响评估保持一致。意义:通过解决有机农业环境影响评估中的不一致问题,这项研究有助于社会和个人做出更有效的决策,从而实现更大的可持续性。
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引用次数: 0
Funciones de indice de sitio para Austrocedrus chilensis en el sudoeste de Rio Negro (Argentina). 里奥内格罗西南部(阿根廷)Austrocedrus chilensis 的地点指数函数。
Pub Date : 2023-11-30 DOI: 10.31220/agrirxiv.2023.00214
Pablo F. Yapura
No obstante los avances en el conocimiento del manejo de los bosques de Austrocedrus chilensis (D. Don) Florin et Boutleje (ciprés de la cordillera), aún se carecen de modelos de producción y para desarrollarlos es esencial la correcta evaluación de la calidad de sitio. En este trabajo se presenta el desarrollo y ajuste de tres variantes de un modelo predictivo del crecimiento en altura dominante que permiten generar funciones de índice de sitio para esta especie. Empleando el método de la ecuación de la diferencia se desarrollaron tres expresiones diferentes del modelo de Chapman-Richards que resultaron invariantes a la edad de referencia. Dos expresiones resultaron polimórficas con asíntota común, mientras que la restante fue anamórfica con asíntota variable. Para generar los datos altura-edad, un total de 23 árboles de sitio, tomados de 10 parcelas, fueron apeados para realizarles el análisis de fuste y reconstruir su crecimiento pasado en altura. En las pruebas convencionales de bondad de ajuste los tres modelos presentaron resultados satisfactorios y ninguno se demostró superior. Considerando criterios e indicadores específicos para las funciones de sitio, el comportamiento predictivo de los tres modelos resultó aceptable, aunque todos mostraron sesgo e imprecisión para edades juveniles. En el rango de edades de mayor importancia práctica la precisión es razonable y el sesgo desaparece, siendo la formulación anamórfica la de mejor desempeño. Para mejorar el comportamiento predictivo, los resultados obtenidos sugieren el uso de la edad a la altura del pecho y el desarrollo de una variante polimórfica con asíntota variable de ese modelo.
尽管在山柏(Austrocedrus chilensis (D. Don) Florin et Boutleje)森林管理方面的知识有所进步,但仍然缺乏生产模型,而正确评估地点质量对开发这些模型至关重要。在本文中,我们介绍了主导高度生长预测模型三个变体的开发和调整情况,以生成该树种的林地指数函数。利用差分方程法,我们建立了查普曼-理查兹模型的三种不同表达式,并发现它们在参考树龄时是不变的。其中两个表达式具有共同渐近线的多态性,其余一个表达式具有渐近线可变的拟态性。为了生成高度-年龄数据,从 10 个地块共砍伐了 23 棵树木,进行茎干分析,以重建其过去的高度增长。在传统的拟合优度测试中,所有三个模型的表现都令人满意,没有一个更优。考虑到场地功能的具体标准和指标,三个模型的预测性能都是可以接受的,尽管在幼年年龄方面都出现了偏差和不精确。在最重要的实际年龄范围内,准确性是合理的,偏差也消失了,其中拟态模型的表现最好。为了提高预测性能,所获得的结果建议使用胸高年龄,并为该模型开发一个具有可变渐近线的多态变体。
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引用次数: 0
Misleading overestimation bias in methods to estimate wolf abundance that use spatial models. 使用空间模型估算狼群数量的方法存在误导性高估偏差。
Pub Date : 2023-11-29 DOI: 10.31220/agrirxiv.2023.00215
Robert L. Crabtree, Dean C. Koch, Subhash R. Lele
1. Population abundance is the main criterion used by agencies to manage and conserve species and it allows adaptive decision-making in response to impacts. Its estimation is particularly important for large mammals, especially carnivores that are notoriously difficult to monitor yet have high ecological and economic importance to humans. Reversal of their historic population decline is also vital to restoring ecosystem health through the ecosystem service of trophic interactions. 2. Because bias and precision (variance) are the independent yardsticks of the quality and reliability of population estimates, we preliminarily assessed new abundance estimators for wolves that non-traditionally use spatial models to estimate the area that an observation represents. Among many biases and problems identified by recent assessments, we identified suspected biases due to obvious violation of the closure assumption in occupancy modeling used to determine the area occupied by territorial pack members. Thus, we chose to simulate the effect of spatial resolution (grid size) on the direction and magnitude of that inherent bias in a recent method called iPOM used in Montana. We also examined the potential bias in their estimate of variance and confidence intervals. 3. We found that even the use of small grid cells (relative to wolf territory size), biased the total area occupied and the number of packs used to calculate abundance. The bias rapidly increases with increasing grid cell size. At the grid cell size used in iPOM for Montana (600 km 2 ) there was a severe overestimation bias of 150% that proliferated through the iPOM submodel structure and resulted in estimated wolf abundance 2.5 times larger than true abundance. 4. This bias alone when combined with a misapplication and underreporting of iPOM's estimate of variance (biased low) results in a precariously misleading situation for decision-makers that threatens wolf populations. Other identified biases that inflate abundance likely make this situation worse but they should be further examined and tested. 5. Due to these biases and the high sensitivity of iPOM's spatial models to estimate area, we suggest that such spatial models should not be used in population estimation methods or such methods, iPOM for example, should be improved and/or restructured with submodels robust to assumption violation thereby reducing bias. Given iPOM's current design, there is no ability to detect change let alone determine wolf population size. 6. We provide a comparative framework for testing and improvement and strongly suggest proper model-assisted sampling designs and hierarchical modeling such as is used in capture-recapture models, especially those that use non-invasive procedures that avoid costly capture and marking. We also recommend collaborative activities that lead to using the best available scientific methods to determine carnivore abundance.
1.种群丰度是各机构管理和保护物种的主要标准,它允许针对影响做出适应性决策。对于大型哺乳动物,尤其是肉食动物来说,种群丰度的估算尤为重要。通过营养相互作用的生态系统服务,扭转其数量下降的历史趋势对于恢复生态系统健康也至关重要。2.由于偏差和精度(方差)是衡量种群估计质量和可靠性的独立标准,我们初步评估了新的狼群数量估计方法,这些方法非传统地使用空间模型来估计观测值所代表的区域。在近期评估所发现的许多偏差和问题中,我们发现由于明显违反了用于确定领地狼群成员所占面积的占用模型中的封闭性假设,导致了疑似偏差。因此,我们选择模拟空间分辨率(网格大小)对蒙大拿州最近使用的 iPOM 方法中固有偏差的方向和大小的影响。我们还研究了其估计方差和置信区间的潜在偏差。3.我们发现,即使使用较小的网格单元(相对于狼领地的大小),用于计算丰度的狼群所占据的总面积和数量也会出现偏差。随着网格单元大小的增加,偏差也会迅速增加。在蒙大拿州 iPOM 中使用的网格单元大小(600 平方公里)下,存在 150% 的严重高估偏差,该偏差在 iPOM 子模型结构中扩散,导致估计的狼群丰度比真实丰度高出 2.5 倍。4.4. 这种偏差与 iPOM 方差估计值(偏低)的误用和低报相结合,给决策者造成了严重的误导,威胁到狼的数量。其他已发现的夸大丰度的偏差可能会使情况变得更糟,但这些偏差应进一步研究和测试。5.由于这些偏差以及 iPOM 空间模型对估计面积的高度敏感性,我们建议在种群估计方法中不使用此类空间模型,或者对此类方法(例如 iPOM)进行改进和/或重组,使其子模型对违反假设的情况具有稳健性,从而减少偏差。鉴于 iPOM 目前的设计,没有能力检测变化,更不用说确定狼的种群数量了。6.我们提供了一个用于测试和改进的比较框架,并强烈建议采用适当的模型辅助采样设计和分层建模,如在捕获-再捕获模型中使用的方法,特别是那些使用非侵入性程序以避免昂贵的捕获和标记的方法。我们还建议开展合作活动,利用现有的最佳科学方法来确定食肉动物的丰度。
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引用次数: 0
Elephant grass ( Pennisetum purpureum ) varieties adaptation trial at North Shewa Zone, Oromia region, Ethiopia. 埃塞俄比亚奥罗莫地区北谢瓦区的象草(Pennisetum purpureum)品种适应性试验。
Pub Date : 2023-11-28 DOI: 10.31220/agrirxiv.2023.00213
Firaol Legesse Mereba
The experiment was conducted in two districts, viz. (Kuyu and Wara Jarso) of the North Shewa Zone, Oromia region. Therefore, this study was initiated to evaluate the adaptability, dry matter yield and chemical composition of four elephant ( Pennisetum purpureum ) grass varieties in the North Shewa Zone. Accordingly, four elephant grass varieties, viz. Bako#04 (16804), Bako#01 (16801), Zehone#03 (16819), and Zehone#02 (16791) were tested in a randomized complete block design (RCBD) with three replications. The data collected were analyzed using R Software, and the results of the combined analysis revealed that plant height, number of tillers, and dry matter yield were significantly (P<0.05) different between treatments. The variety Zehone#02 (88.50 cm) had the highest mean plant height, while the variety Bako#01 had the lowest plant height (66.89 cm). The highest (p<0.05) dry matter yield (12.27 ton ha -1 ) was recorded for the Zehone#02 variety, whereas the lowest dry matter yield (10.70 ton ha -1 ) was recorded for the Zehone#03 variety. The number of nodes per plant varied, whereas internodes length and leaf-to-stem ratio did not vary significantly among elephant grass varieties. The analysis results showed non-significant (P>0.05) difference for DM, Ash, and NDF, whereas significant variation was observed in most parameters, including CP, ADF, ADL, IVDMD, DODM and ME. The elephant grass variety Bako#04 (16804) showed better CP (11.37%) content, followed by Zehone#02 (16791) (10.54%). Therefore, the Bako#04 (16804) and Zehone#02 (16791) varieties of elephant grass are recommended for livestock producers in the North Shewa Zone, Oromia.
试验在奥罗米亚地区北谢瓦区的两个县(库尤和瓦拉贾索)进行。因此,本研究旨在评估北谢瓦区四个象草品种的适应性、干物质产量和化学成分。因此,四种象草品种,即 Bako#04 (16804)、Bako#01 (16801)、Zehone#03 (16819) 和 Zehone#02 (16791)在随机完全区组设计(RCBD)中进行了试验,三次重复。采用 R 软件对所收集的数据进行分析,综合分析结果表明,植株高度、分蘖数和干物质产量在 DM、灰分和 NDF 方面差异显著(P0.05),而在 CP、ADF、ADL、IVDMD、DODM 和 ME 等大多数参数方面差异显著。象草品种 Bako#04(16804)的 CP(11.37%)含量较好,其次是 Zehone#02(16791)(10.54%)。因此,建议奥罗米亚州北谢瓦区的畜牧生产者使用 Bako#04 (16804) 和 Zehone#02 (16791) 象草品种。
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引用次数: 0
Precision organic farming, increasing grain yield, soil nutrient management and economic viability for maize production. 精准有机耕作、提高谷物产量、土壤养分管理和玉米生产的经济可行性。
Pub Date : 2023-11-15 DOI: 10.31220/agrirxiv.2023.00212
J. N. Kariithi, D. S. Ngosia, Felix K. Kamau, Daniel I. Rubenstein
Precision organic farming was designed to develop a system of wise stewardship of land using principles of ecology and agriculture. A prevailing question remains on how to balance increasing crop yields whilst maintaining soil nutrients. Here, we demonstrate that precision organic farming can increase yields, soil nutrient composition, and soil organic carbon temporarily. but that effectiveness depends on the environmental context. We designed a set of multi-plot demonstrations using a randomized complete block design, consisting of nine equal plots growing maize with two fertilizer treatments, compost manure, and chemical fertilizers across years with different rainfall profiles. We also considered the outcome of the control plots where no treatment was applied. The experiment site is located in the transboundary Mount Elgon ecosystem between Kenya and Uganda. Observations recorded over a two-year cycle of empirical assessments indicate that the use of compost manure is not inferior to the use of chemical fertilizers. We analyzed the data using both descriptive and statistical approaches. Additionally, we calculated the benefit-cost analysis of farm treatments based on output from the cost return utility for both growing seasons. Analyses suggest that even in years where the addition of artificial fertilizer increases yield above that generated by the addition of compost, the total yield is so low that the economic gains do not exceed the costs of adding fertilizer. We conclude that precision organic agriculture using compost as a supplement can be adopted as an alternative climate-resilient agricultural practice at reduced capital costs for maize crop production systems in good and bad rainfall years.
精准有机耕作的目的是利用生态学和农业原理开发一种明智的土地管理制度。如何在提高作物产量的同时保持土壤养分,仍然是一个普遍存在的问题。在此,我们证明精准有机耕作可以暂时提高产量、增加土壤养分组成和土壤有机碳,但其有效性取决于环境背景。我们采用随机完全区组设计设计了一组多地块示范,由九个等面积地块组成,在不同降雨量的年份种植玉米,并施用两种肥料处理、堆肥和化肥。我们还考虑了未施肥处理的对照地块的结果。实验地点位于肯尼亚和乌干达之间的埃尔贡山跨境生态系统。两年的经验评估记录表明,使用堆肥并不比使用化肥差。我们使用描述性和统计方法对数据进行了分析。此外,我们还根据两个生长季节的成本回报效用产出,计算了农场处理的效益成本分析。分析表明,即使在添加人工肥料的年份,产量的增幅超过了添加堆肥的增幅,但总产量仍然很低,以至于经济收益没有超过添加肥料的成本。我们的结论是,使用堆肥作为补充的精准有机农业可作为玉米作物生产系统的另一种气候适应性农业实践,在降雨量好和降雨量差的年份都能降低资本成本。
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