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Reducing CO2 Flux by Decreasing Tillage in Ohio: Overcoming Conjecture with Data 俄亥俄州减少耕作减少二氧化碳通量:用数据克服猜想
Pub Date : 2018-02-09 DOI: 10.5539/JAS.V10N3P1
Deb L. O'Dell, N. Eash, B. Hicks, Joel N. Oetting, T. Sauer, D. Lambert, J. Logan, W. Wright, J. Zahn
While the literature is clear about excessive tillage decreasing soil carbon (C) content, there are few experimental studies that document the comparative effects of soil and crop management on C sequestration. Using micrometeorology we measured CO2 flux from a maize crop grown on both no-till and tilled soils in north-central Ohio. We used Bowen Ratio Energy Balance (BREB) systems to quantify the flux between the atmosphere and either the soil surface (at crop planting) or 0.2 m above the canopy once the crop was established and growing. The no-till plot sequestered 263 g CO2 m-2 (90% confidence interval -432.1 to -99.9) while the tilled plot emitted 146 g CO2 m-2 (90% confidence interval -53.3 to 332.2) during 104 days of the 2015 growing season; a net difference of 410 g CO2 m-2. The difference is statistically significant at the 90% confidence level (based on a bootstrap analysis). The results indicate that no-tillage practices can sequester C, maintain soil productivity, and ensure landscape sustainability.
虽然文献清楚地表明过度耕作会降低土壤碳(C)含量,但很少有实验研究记录土壤和作物管理对碳固存的比较影响。利用微气象学,我们测量了俄亥俄州中北部一种玉米作物在免耕和耕两种土壤上的二氧化碳通量。我们使用鲍文比能量平衡(BREB)系统来量化大气与土壤表面(作物种植时)或作物建立和生长后冠层上方0.2 m之间的通量。在2015年生长季的104天内,免耕区吸收了263 g CO2 m-2(90%置信区间为-432.1 ~ -99.9),而耕区排放了146 g CO2 m-2(90%置信区间为-53.3 ~ 332.2);净差为410克CO2 m-2。在90%的置信水平上(基于自举分析),差异具有统计学意义。结果表明,免耕可以固碳,保持土壤生产力,保证景观可持续性。
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引用次数: 7
Socioeconomic Analysis of Rural Credit and Technical Assistance for Family Farmers in the Transamazonian Territory, in the Brazilian Amazon 巴西亚马逊地区跨亚马逊地区农村信贷和家庭农民技术援助的社会经济分析
Pub Date : 2016-09-07 DOI: 10.5539/JAS.V8N10P177
G. X. P. Filho, Miquéias Freitas Calvi, R. A. Castro
In Brazil, Rural Credit and Technical Assistance policies for family farming were formulated with the goal of promoting rural development in a sustainable and integrated manner. This study is the result of the Monitoring and assessment of public policies for territory management in the Para Amazon project, undertaken by the Federal University of Para (UFPA), aimed to evaluate the main socioeconomic impacts and limitations for the execution of these policies in the Transamazonian Territory. It is characterized as qualitative and exploratory, developed from bibliographic research and field research, based on data obtained through interviews conducted with 22 families of farmers who are beneficiaries of Rural Credit, the B modality of the National Programme for Strengthening Family Agriculture (PRONAF) and of the Technical Assistance Policy, whose sample corresponds to 10% of total contracts made effective within that Territory, between the years of 2013 and 2014. In addition to these farmers, for the analysis of the Technical Assistance service, interviews were conducted with extension workers from eight organizations, one of which is a state public company and seven of which are outsourced companies hired by the Federal Government to provide this service. The descriptive analysis shows that PRONAF B focuses on areas that produce short cycle food crops and on fishing activities. The technical assistance service provided by the public company is carried out in all the cities within the Territory, but only meets 10% of the demand; the service provided by the outsourced companies also occurs in all cities and its greatest setback is the delay in the release of funds by the Federal Government, which generates delays in the agricultural calendar and discontinuity in the productive activities, due to the end of the term of the companies’ contracts.
在巴西,为家庭农业制订了农村信贷和技术援助政策,其目标是以可持续和综合的方式促进农村发展。本研究是帕拉联邦大学(UFPA)对帕拉亚马逊地区项目中领土管理公共政策进行监测和评估的结果,旨在评估这些政策在跨亚马逊地区执行的主要社会经济影响和限制。它的特点是定性的和探索性的,从文献研究和实地研究中发展而来,基于对农村信贷、国家加强家庭农业计划B模式和技术援助政策受益者的22个农民家庭进行访谈获得的数据,其样本相当于2013年至2014年期间该领土有效合同总额的10%。除了这些农民之外,为了分析技术援助服务,还采访了来自八个组织的推广人员,其中一个是国营公司,另外七个是联邦政府雇用的外包公司,以提供这项服务。描述性分析表明,PRONAF B侧重于生产短周期粮食作物的地区和渔业活动。上市公司提供的技术援助服务在领土内所有城市开展,但只满足10%的需求;外包公司提供的服务也在所有城市进行,其最大的挫折是联邦政府延迟发放资金,由于外包公司的合同期限已满,这造成了农业日历的延误和生产活动的中断。
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引用次数: 7
Mechanisms and Sources of Resistance in Tropical Maize Inbred Lines to Chilopartellus Stem Borers 热带玉米自交系对螟虫的抗性机制及来源
Pub Date : 2013-06-07 DOI: 10.5539/JAS.V5N7P51
S. Munyiri, S. Mugo, M. Otim, J. Mwololo, P. Okori
Developing maize with durable resistance to maize stem borers could be enhanced by identifying genotypes with different mechanisms of resistance and pyramiding the resistances into high yielding genotypes. This study was carried out on 120 CIMMYT tropical maize inbred lines to identify the most important mechanisms of resistance that could be used to discriminate the germplasm into resistant or susceptible categories. The experiment was laid in an α-lattice design, and replicated three times during the 2011/12 seasons. Traits measured were leaf toughness, stem penetrometer resistance, trichome density, stem sugar content, leaf damage, number of stem exit holes and stem cumulative tunnel length. A selection index was computed and categorized the 120 inbred lines into 33 resistant, 29 moderately resistant, 31 moderately susceptible and 27 susceptible. The most resistant lines were those derived from the CIMMYT multiple borer-resistant populations with CKSBL10039 being most resistant and CML395 most susceptible with indices of 0.49 and 1.84, respectively. Trichome density, leaf toughness and stem sugar content in that order were the most important traits in discriminating the lines into resistance and susceptible categories. More research is needed to classify the specific types of trichomes and sugars present in both resistant and susceptible inbred lines.
鉴定具有不同抗性机制的基因型,并将其转化为高产基因型,可以提高玉米对螟虫的耐久抗性。本研究对120个CIMMYT热带玉米自交系进行了研究,以确定最重要的抗性机制,可用于将种质资源区分为抗性或易感类别。实验采用α-晶格设计,并在2011/12季节重复了三次。测定的性状包括叶片韧性、茎秆抗穿透性、毛状体密度、茎秆含糖量、叶片损伤程度、茎秆出口孔数和茎秆累积隧道长度。通过选择指数计算,将120份自交系分为抗33份、中抗29份、中感31份和感27份。其中,CKSBL10039抗性最强,CML395最敏感,指数分别为0.49和1.84。毛状体密度、叶片韧性和茎含糖量是区分抗性和敏感品系的最重要性状。需要更多的研究来对抗性和易感自交系中存在的特定类型的毛状体和糖进行分类。
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引用次数: 13
Benefits and Challenges of Serious Gaming - The Case of “The Maladaptation Game” 严肃游戏的好处和挑战——以“适应不良游戏”为例
Pub Date : 1900-01-01 DOI: 10.37247/paar.1.2020.9
Therese Asplund, T. Neset, J. Käyhkö, L. Wiréhn, S. Juhola
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引用次数: 3
Analyzing and Modeling Environmental and Production Variables in Weaned Piglet Farms 断奶仔猪养殖场环境与生产变量分析与建模
Pub Date : 1900-01-01 DOI: 10.37247/paar.1.2020.20
M. R. Rodríguez, R. Besteiro, Tamara Arango, J. Ortega, M. D. Fernández
Environmental variables and animal activity were analyzed to improve environmental control systems in conventional post weaning livestock buildings. Post weaning is a very sensitive phase in the rearing of piglets from 5 to 20 kg, mainly influenced by separation from the sow, mixing of litters and changes in diet or environment. For this reason, environmental requirements are Prime Archives in Agricultural Research 2 www.videleaf.com strict and changing. To achieve these requirements, livestock buildings have ventilation and heating systems, usually regulated by temperature-based controls. In addition to temperature, other important environmental variables include relative humidity, CO2 and NH3 concentrations. Other variables that characterize the state of the animal, such as animal activity, should be added to the environmental variables in order that indoor climate and animal behavior may serve as the basis for new environmental control strategies. Such strategies should contribute to achieving maximum performance with the lowest possible use of resources, while focusing on animal welfare and production efficiency.
分析环境变量和动物活动,以改进传统断奶后畜舍的环境控制系统。断奶后是5 ~ 20 kg仔猪饲养的一个非常敏感的阶段,主要受母猪分离、窝料混合以及日粮或环境变化的影响。因此,环境要求在农业研究2 www.videleaf.com中是严格且不断变化的。为了达到这些要求,畜舍有通风和供暖系统,通常由基于温度的控制来调节。除了温度,其他重要的环境变量包括相对湿度、CO2和NH3浓度。表征动物状态的其他变量,如动物活动,应添加到环境变量中,以便室内气候和动物行为可以作为新的环境控制策略的基础。这种战略应有助于以尽可能少的资源利用实现最高绩效,同时注重动物福利和生产效率。
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引用次数: 1
Opportunities for Quality Seed Production and Diffusion through Integration of the Informal Systems in Sub-Saharan Africa 通过整合撒哈拉以南非洲的非正式系统实现优质种子生产和传播的机会
Pub Date : 1900-01-01 DOI: 10.37247/paar.1.2020.19
S. Munyiri
In perpetuating the preferred crop species, seed is exchanged among family members, neighboring communities or between tribes and regions according to customs and practices in many African traditions. Overtime, this form of seed sharing and trade formed the basis of the informal seed system also referred to as the farmer-based system or the traditional system. The majority of farmers in sub-Saharan Africa (SSA) are resource-poor and operate under myriad of constraints including technological, social, infrastructural and cultural limitations thus are mostly unable to access and source recommended quality crop seeds from the existing formal seed systems. Such seeds are pricey and their distribution channels are geographically limited in SSA. These challenges have partly resulted to the growth and persistence of the informal seed sector in the region. Crops established using poor quality seed lead to low yields and poor quality products. Most of the seeds exchanged in the informal sector do not meet the desired quality recommendations and these setbacks have been attributed to low crop production, disease and pest spread across farms and regions. While it is recognized that the informal sector is key in SSA, the challenge in enforcing quality has not been fully addressed to date. Further, due to overreliance on the formal sector for innovation dissemination, there is slow diffusion of new superior improved seeds. Seed is the most easily adopted innovation for improving agricultural productivity and ensuring food security. Essentially, all other agronomic efforts only enhance the inherent capability of a good seed, thus for greater yields, its quality must be unquestionable. The relative importance of the formal and informal seed suppliers is determined in part by biological and technical factors associated with seed production, multiplication, processing and distribution. The development of the formal seed system alone cannot solve the severe lack of quality planting materials in developing countries especially in SSA where perpetual food insufficiency is the norm. Enhancing the informal seed supply systems in the region could partly be achieved through gradual technical supported integration of the two seed systems and exploiting their synergy benefit at community levels. This review is premised on published work and has attempted to examine existing opportunities for enhancing quality seed production and distribution through integration of the two major systems.
为了使首选作物品种永久化,根据许多非洲传统的习俗和做法,在家庭成员之间、邻近社区之间或部落和地区之间交换种子。随着时间的推移,这种形式的种子分享和贸易形成了非正式种子系统的基础,也被称为以农民为基础的系统或传统系统。撒哈拉以南非洲(SSA)的大多数农民资源贫乏,经营受到各种限制,包括技术、社会、基础设施和文化限制,因此大多数农民无法从现有的正规种子系统获取和获取推荐的优质作物种子。这些种子价格昂贵,而且它们的分销渠道在SSA受到地理限制。这些挑战在一定程度上导致了该地区非正规种子部门的增长和持续存在。使用劣质种子种植的作物导致低产量和劣质产品。非正规部门交换的大多数种子不符合期望的质量建议,这些挫折是由于作物产量低,病虫害在农场和地区蔓延。虽然人们认识到非正规部门是社会福利的关键,但迄今为止,在执行质量方面的挑战尚未得到充分解决。此外,由于过度依赖正规部门进行创新传播,新的优质改良种子传播缓慢。种子是提高农业生产力和确保粮食安全最容易采用的创新。从本质上讲,所有其他的农艺努力都只是提高好种子的内在能力,因此为了获得更高的产量,它的质量必须是不容置疑的。正式和非正式种子供应商的相对重要性部分取决于与种子生产、繁殖、加工和分配有关的生物和技术因素。发展正规的种子系统本身并不能解决发展中国家,特别是在粮食长期不足是常态的SSA国家,严重缺乏优质种植材料的问题。通过在技术支持下逐步将两种种子系统整合起来,并在社区层面利用它们的协同效益,可以在一定程度上加强该区域的非正式种子供应系统。本综述以已发表的工作为基础,并试图审查通过整合两个主要系统来提高优质种子生产和销售的现有机会。
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引用次数: 2
Advanced Breeding Tools in Vegetable Crops 蔬菜作物的先进育种工具
Pub Date : 1900-01-01 DOI: 10.37247/paar.1.2019.1-28
J. Dias, R. Ortiz
Vegetables are key ingredients in a well-balanced nutritious diet. Their worldwide rising consumption reveals the awareness of their health benefits. The major biotic factors affecting vegetable production are pathogens causing diseases, insects and nematodes pests, and weeds. Vegetables are also sensitive to drought, flood, heat, frost and salinity. Plant breeding provides means for introducing host plant resistance, adapting crops to stressful environments, and developing cultivars with the desired produce quality. The genetic enhancement of vegetables aims Prime Archives in Agricultural Research 2 www.videleaf.com achieving the market-driven quality along with agronomic performance needed by growers. Trait heritability, gene action, number of genes controlling the target trait(s), heterosis and genotype × environment interactions determine the vegetable breeding method to use. Coupled with the use of dense DNA markers and phenotyping data, quantitative genetic analysis facilitates dissecting trait variation and predicting merit or breeding values of offspring. Genomics, phenomics and breeding informatics further facilitate screening of target characteristics, thus accelerating the finding of desired traits and contributing gene(s) in vegetables. Genomic estimated breeding values are used today for predicting traits, thus replacing the routine of expensive phenotyping with inexpensive genotyping. Genetic engineering protocols for transgenic breeding are available in various vegetables, and may be useful if target trait(s) are unavailable in genebank or breeding population. Transgenic cultivars could overcome some limiting factors in vegetable production such as pathogens, pests, and weeds, thus reducing pesticide residues, human poisoning and management costs in horticulture. Gene editing can be also a useful approach for improving traits in vegetables and speed breeding. Examples are taken from various vegetables (including root and tuber crops) to show how these advances translate in genetic gains and save time and resources in their breeding.
蔬菜是营养均衡饮食的关键成分。它们在世界范围内不断增长的消费表明,人们意识到了它们对健康的好处。影响蔬菜生产的主要生物因素是致病菌、虫、线虫害虫和杂草。蔬菜对干旱、洪水、高温、霜冻和盐度也很敏感。植物育种为引入寄主植物抗性、使作物适应逆境环境以及培育具有所需产品质量的品种提供了手段。蔬菜基因增强的目标是Prime Archives in Agricultural Research 2 www.videleaf.com实现以市场为导向的质量以及种植者所需的农艺性能。性状遗传力、基因作用、控制目标性状的基因数量、杂种优势和基因型与环境的相互作用决定了蔬菜育种方法的选用。结合密集DNA标记和表型数据的使用,定量遗传分析有助于解剖性状变异和预测后代的优点或育种价值。基因组学、表型组学和育种信息学进一步促进了目标性状的筛选,从而加快了蔬菜所需性状和贡献基因的发现。目前,基因组估计育种值用于预测性状,从而用廉价的基因分型取代昂贵的表型分型。转基因育种的基因工程方案可用于各种蔬菜,如果目标性状在基因库或育种群体中不可用,可能是有用的。转基因品种可以克服蔬菜生产中的一些限制因素,如病原菌、害虫和杂草,从而减少农药残留、人体中毒和园艺管理成本。基因编辑也是改善蔬菜性状和加快育种速度的有用方法。以各种蔬菜(包括块根和块茎作物)为例,说明这些进步如何转化为遗传收益,并在育种中节省时间和资源。
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引用次数: 1
Advances in Transgenic Vegetable and Fruit Breeding 转基因蔬菜和水果育种研究进展
Pub Date : 1900-01-01 DOI: 10.37247/paar.1.2019.1-46
J. Dias, R. Ortiz
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引用次数: 0
Understanding and Changing Farming, Food & Fiber Systems. The Organic Cotton Case in Mali and West Africa 理解和改变农业、食品和纤维系统。马里和西非的有机棉案例
Pub Date : 1900-01-01 DOI: 10.37247/paar.1.2020.8
Gian L Nicolay
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引用次数: 0
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Prime Archives in Agricultural Research
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